TiDB 配置文件描述 | TiDB 文档中心

相关文章推荐

爱运动的太阳 · TiDB 中的 TimeStamp ...· 1 周前 ·

逆袭的烈马 · MySQL正则替换：如何用正则表达式替换值- ...· 1 周前 ·

失恋的仙人掌 · TiDB 配置文件描述 | TiDB 文档中心· 2 天前 ·

严肃的乒乓球 · ajax post导出文件 - CSDN文库· 4 月前 ·

严肃的围巾 · 【hive】count() ...· 5 月前 ·

神勇威武的高山 · 如何在GitLab ...· 1 年前 ·

威武的火龙果 · oracle去除表中字段中特殊符号（'tab ...· 1 年前 ·

微醺的匕首 · 修复 ZooKeeper 数据视图不一致 - 知乎· 1 年前 ·

</noscript><noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-TPX49SBK" height="0" width="0" style="display: none; visibility: hidden" aria-hidden="true"/></noscript><div id="___gatsby"><div style="outline:none" tabindex="-1" id="gatsby-focus-wrapper"><header class="MuiPaper-root MuiPaper-elevation MuiPaper-elevation4 MuiAppBar-root MuiAppBar-colorPrimary MuiAppBar-positionFixed doc-site-header mui-fixed css-r4hqpc"><div class="MuiToolbar-root MuiToolbar-gutters MuiToolbar-regular css-11fgfqk"><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeMedium css-iuftj9" tabindex="0" type="button" aria-label="menu"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium css-vubbuv" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="MenuIcon"><path d="M3 18h18v-2H3v2zm0-5h18v-2H3v2zm0-7v2h18V6H3z"/></svg></button><div class="MuiBox-root css-13tqxrv"><a style="text-decoration:none" href="/zh/"><svg width="152" height="36" viewbox="0 0 152 36" fill="none"><g clip-path="url(#clip0_789_1365)"><path d="M0 26.9605V9.04959C0 9.01208 0.0187549 8.98395 0.0468872 8.96519L15.5478 0.00973267C15.5759 -0.00902222 15.6134 -0.00902222 15.6416 0.00973267L31.1425 8.95581C31.1706 8.97457 31.1894 9.0027 31.1894 9.04021V26.9511C31.1894 26.9886 31.1706 27.0168 31.1425 27.0355L15.6416 35.991C15.6134 36.0097 15.5759 36.0097 15.5478 35.991L0.0468872 27.0355C0.0187549 27.0168 0 26.9886 0 26.9605Z" fill="#DC150B"/><path d="M10.3808 15.0336C10.3714 15.0242 10.3527 15.0149 10.3433 15.0242L5.25136 17.9688H5.2326C5.21384 17.9688 5.20447 17.9594 5.20447 17.9406V12.0047C5.20447 11.9953 5.21384 11.986 5.22322 11.9766L5.22322 11.9766L15.5572 6.01253C15.5665 6.00315 15.5759 6.00315 15.5853 6.01253L20.7241 8.9758L20.7335 8.98518C20.7429 8.99455 20.7335 9.01331 20.7241 9.02268L15.5759 11.9953C15.5665 12.0047 15.5572 12.0141 15.5572 12.0235V29.9625V29.9813C15.5478 29.9906 15.529 30 15.5197 29.9906L10.3902 27.0368C10.3902 27.0274 10.3808 27.018 10.3808 27.0086V15.0524V15.0336Z" fill="white"/><path d="M20.7992 26.9992C20.7804 26.9992 20.7616 26.9805 20.7616 26.9617V15.0336C20.7616 15.0149 20.771 15.0055 20.7804 14.9961L25.9286 12.0235L25.9286 12.0235C25.938 12.0141 25.938 12.0141 25.9474 12.0141C25.9661 12.0141 25.9849 12.0328 25.9849 12.0516V23.9797C25.9849 23.9985 25.9755 24.0078 25.9661 24.0172L20.8179 26.9899C20.8085 26.9992 20.8085 26.9992 20.7992 26.9992Z" fill="white"/></g><path d="M37.1894 12.4971H42.0242V26.9998H45.4248V12.4971H50.2596V9.37683H37.1894V12.4971Z" fill="black"/><path d="M53.6372 9C53.1197 9 52.6672 9.18709 52.2887 9.55826C51.9102 9.92943 51.7151 10.3941 51.7151 10.9373C51.7151 11.4503 51.9073 11.8999 52.2858 12.2802C52.6643 12.6574 53.1167 12.8505 53.6342 12.8505C54.1517 12.8505 54.5775 12.6574 54.9501 12.2802C55.3227 11.903 55.509 11.4503 55.509 10.9373C55.509 10.3941 55.3257 9.93245 54.9619 9.56128C54.5982 9.19011 54.1517 9.00302 53.6372 9.00302V9Z" fill="black"/><path d="M55.2895 14.3592H51.9864V27H55.2895V14.3592Z" fill="black"/><path d="M64.3322 9.37683H58.2613V26.9998H64.3322C66.9492 26.9998 69.028 26.2031 70.5124 24.6309C71.9939 23.0587 72.748 20.8921 72.748 18.1883C72.748 15.4845 71.9969 13.2967 70.5124 11.7336C69.028 10.1705 66.9492 9.37683 64.3322 9.37683ZM61.6619 12.4971H64.2109C65.9024 12.4971 67.1798 12.998 68.0137 13.9847C68.8506 14.9775 69.2734 16.3566 69.2734 18.0857C69.2734 19.8148 68.8476 21.2512 68.0108 22.3013C67.1769 23.3454 65.8994 23.8765 64.208 23.8765H61.659V12.494L61.6619 12.4971Z" fill="black"/><path d="M86.5964 19.1388C86.0346 18.4418 85.3663 17.9409 84.6152 17.6512V17.621C86.1883 16.8424 86.9838 15.566 86.9838 13.8278C86.9838 12.479 86.5461 11.3866 85.6856 10.5839C84.8251 9.78421 83.5566 9.37683 81.9154 9.37683H74.7948V26.9998H81.8681C83.6068 26.9998 84.9907 26.5652 85.9784 25.7082C86.972 24.8482 87.4747 23.6261 87.4747 22.075C87.4747 20.8468 87.179 19.8601 86.5994 19.1388H86.5964ZM78.1185 16.5256V12.1953H81.4718C82.1105 12.1953 82.628 12.3884 83.0095 12.7686C83.388 13.1489 83.5802 13.68 83.5802 14.3499C83.5802 15.0198 83.3909 15.5569 83.0184 15.9432C82.6458 16.3294 82.1105 16.5256 81.4216 16.5256H78.1156H78.1185ZM83.9972 21.8245C83.9972 22.5276 83.7872 23.101 83.3762 23.5295C82.9651 23.958 82.356 24.1753 81.5724 24.1753H78.1215V19.3471H81.5724C82.3235 19.3471 82.9237 19.5794 83.3525 20.0411C83.7813 20.5028 84.0001 21.1033 84.0001 21.8215L83.9972 21.8245Z" fill="black"/><path d="M97.3306 26.5V9.7H102.299C107.771 9.7 111.083 12.868 111.083 18.1C111.083 23.332 107.771 26.5 102.299 26.5H97.3306ZM102.299 24.364C106.331 24.364 108.659 22.06 108.659 18.1C108.659 14.14 106.331 11.836 102.299 11.836H99.7066V24.364H102.299ZM118.968 26.764C115.464 26.764 112.824 24.052 112.824 20.5C112.824 16.948 115.464 14.236 118.968 14.236C122.472 14.236 125.112 16.948 125.112 20.5C125.112 24.052 122.472 26.764 118.968 26.764ZM118.968 24.628C121.152 24.628 122.736 22.876 122.736 20.5C122.736 18.124 121.152 16.372 118.968 16.372C116.784 16.372 115.2 18.124 115.2 20.5C115.2 22.876 116.784 24.628 118.968 24.628ZM132.772 26.764C129.22 26.764 126.7 24.124 126.7 20.5C126.7 16.876 129.22 14.236 132.772 14.236C135.652 14.236 137.884 15.964 138.244 18.532H135.844C135.532 17.236 134.332 16.372 132.772 16.372C130.588 16.372 129.076 18.076 129.076 20.5C129.076 22.9 130.588 24.628 132.772 24.628C134.332 24.628 135.532 23.764 135.844 22.468H138.244C137.884 25.036 135.652 26.764 132.772 26.764ZM144.557 26.764C141.677 26.764 139.781 25.108 139.709 22.732H142.085C142.229 23.956 142.973 24.724 144.581 24.724C145.733 24.724 146.765 24.34 146.765 23.332C146.765 22.588 146.333 22.06 145.157 21.7L143.333 21.172C141.173 20.548 140.093 19.3 140.093 17.716C140.093 15.604 141.965 14.236 144.413 14.236C146.885 14.236 148.685 15.7 148.829 17.74H146.453C146.285 16.828 145.445 16.204 144.341 16.204C143.261 16.204 142.469 16.804 142.469 17.716C142.469 18.412 142.925 18.868 144.245 19.228L146.069 19.732C148.109 20.308 149.141 21.556 149.141 23.188C149.141 25.396 147.197 26.764 144.557 26.764Z" fill="black"/><defs><clippath id="clip0_789_1365"><rect width="31.1894" height="36" fill="white"/></clippath></defs></svg></a></div><div class="css-2iqpys"><div class="MuiBox-root css-irbys9"><a style="text-decoration:none" hreflang="zh" href="/zh/tidb/stable"><div class="MuiTypography-root MuiTypography-body1 css-195ggqq">TiDB</div></a></div><div class="MuiBox-root css-kiou0g"><a class="MuiTypography-root MuiTypography-body1 css-ae3kd9" target="_blank" href="https://asktug.com/" style="text-decoration:none"><div class="MuiTypography-root MuiTypography-body1 css-195ggqq">社区</div></a></div><div class="MuiBox-root css-kiou0g"><a class="MuiTypography-root MuiTypography-body1 css-ae3kd9" target="_blank" href="https://cn.pingcap.com/contact/" style="text-decoration:none"><div class="MuiTypography-root MuiTypography-body1 css-195ggqq">联系我们</div></a></div><div class="MuiBox-root css-kiou0g"><a class="MuiTypography-root MuiTypography-body1 css-ae3kd9" target="_blank" href="https://cn.pingcap.com/product/#SelectProduct" style="text-decoration:none"><div class="MuiTypography-root MuiTypography-body1 css-195ggqq"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="DownloadIcon"><path d="M5 20h14v-2H5v2zM19 9h-4V3H9v6H5l7 7 7-7z"/></svg></div></a></div></div><div class="MuiBox-root css-1vn3uc0"><button class="MuiButtonBase-root MuiButton-root MuiButton-text MuiButton-textInherit MuiButton-sizeMedium MuiButton-textSizeMedium MuiButton-colorInherit MuiButton-disableElevation css-tjg32r" tabindex="0" type="button" id="header-nav-items" aria-haspopup="true"><span class="MuiButton-startIcon MuiButton-iconSizeMedium css-1l6c7y9"><svg width="152" height="36" viewbox="0 0 152 36" fill="none"><g clip-path="url(#clip0_789_1365)"><path d="M0 26.9605V9.04959C0 9.01208 0.0187549 8.98395 0.0468872 8.96519L15.5478 0.00973267C15.5759 -0.00902222 15.6134 -0.00902222 15.6416 0.00973267L31.1425 8.95581C31.1706 8.97457 31.1894 9.0027 31.1894 9.04021V26.9511C31.1894 26.9886 31.1706 27.0168 31.1425 27.0355L15.6416 35.991C15.6134 36.0097 15.5759 36.0097 15.5478 35.991L0.0468872 27.0355C0.0187549 27.0168 0 26.9886 0 26.9605Z" fill="#DC150B"/><path d="M10.3808 15.0336C10.3714 15.0242 10.3527 15.0149 10.3433 15.0242L5.25136 17.9688H5.2326C5.21384 17.9688 5.20447 17.9594 5.20447 17.9406V12.0047C5.20447 11.9953 5.21384 11.986 5.22322 11.9766L5.22322 11.9766L15.5572 6.01253C15.5665 6.00315 15.5759 6.00315 15.5853 6.01253L20.7241 8.9758L20.7335 8.98518C20.7429 8.99455 20.7335 9.01331 20.7241 9.02268L15.5759 11.9953C15.5665 12.0047 15.5572 12.0141 15.5572 12.0235V29.9625V29.9813C15.5478 29.9906 15.529 30 15.5197 29.9906L10.3902 27.0368C10.3902 27.0274 10.3808 27.018 10.3808 27.0086V15.0524V15.0336Z" fill="white"/><path d="M20.7992 26.9992C20.7804 26.9992 20.7616 26.9805 20.7616 26.9617V15.0336C20.7616 15.0149 20.771 15.0055 20.7804 14.9961L25.9286 12.0235L25.9286 12.0235C25.938 12.0141 25.938 12.0141 25.9474 12.0141C25.9661 12.0141 25.9849 12.0328 25.9849 12.0516V23.9797C25.9849 23.9985 25.9755 24.0078 25.9661 24.0172L20.8179 26.9899C20.8085 26.9992 20.8085 26.9992 20.7992 26.9992Z" fill="white"/></g><path d="M37.1894 12.4971H42.0242V26.9998H45.4248V12.4971H50.2596V9.37683H37.1894V12.4971Z" fill="black"/><path d="M53.6372 9C53.1197 9 52.6672 9.18709 52.2887 9.55826C51.9102 9.92943 51.7151 10.3941 51.7151 10.9373C51.7151 11.4503 51.9073 11.8999 52.2858 12.2802C52.6643 12.6574 53.1167 12.8505 53.6342 12.8505C54.1517 12.8505 54.5775 12.6574 54.9501 12.2802C55.3227 11.903 55.509 11.4503 55.509 10.9373C55.509 10.3941 55.3257 9.93245 54.9619 9.56128C54.5982 9.19011 54.1517 9.00302 53.6372 9.00302V9Z" fill="black"/><path d="M55.2895 14.3592H51.9864V27H55.2895V14.3592Z" fill="black"/><path d="M64.3322 9.37683H58.2613V26.9998H64.3322C66.9492 26.9998 69.028 26.2031 70.5124 24.6309C71.9939 23.0587 72.748 20.8921 72.748 18.1883C72.748 15.4845 71.9969 13.2967 70.5124 11.7336C69.028 10.1705 66.9492 9.37683 64.3322 9.37683ZM61.6619 12.4971H64.2109C65.9024 12.4971 67.1798 12.998 68.0137 13.9847C68.8506 14.9775 69.2734 16.3566 69.2734 18.0857C69.2734 19.8148 68.8476 21.2512 68.0108 22.3013C67.1769 23.3454 65.8994 23.8765 64.208 23.8765H61.659V12.494L61.6619 12.4971Z" fill="black"/><path d="M86.5964 19.1388C86.0346 18.4418 85.3663 17.9409 84.6152 17.6512V17.621C86.1883 16.8424 86.9838 15.566 86.9838 13.8278C86.9838 12.479 86.5461 11.3866 85.6856 10.5839C84.8251 9.78421 83.5566 9.37683 81.9154 9.37683H74.7948V26.9998H81.8681C83.6068 26.9998 84.9907 26.5652 85.9784 25.7082C86.972 24.8482 87.4747 23.6261 87.4747 22.075C87.4747 20.8468 87.179 19.8601 86.5994 19.1388H86.5964ZM78.1185 16.5256V12.1953H81.4718C82.1105 12.1953 82.628 12.3884 83.0095 12.7686C83.388 13.1489 83.5802 13.68 83.5802 14.3499C83.5802 15.0198 83.3909 15.5569 83.0184 15.9432C82.6458 16.3294 82.1105 16.5256 81.4216 16.5256H78.1156H78.1185ZM83.9972 21.8245C83.9972 22.5276 83.7872 23.101 83.3762 23.5295C82.9651 23.958 82.356 24.1753 81.5724 24.1753H78.1215V19.3471H81.5724C82.3235 19.3471 82.9237 19.5794 83.3525 20.0411C83.7813 20.5028 84.0001 21.1033 84.0001 21.8215L83.9972 21.8245Z" fill="black"/><path d="M97.3306 26.5V9.7H102.299C107.771 9.7 111.083 12.868 111.083 18.1C111.083 23.332 107.771 26.5 102.299 26.5H97.3306ZM102.299 24.364C106.331 24.364 108.659 22.06 108.659 18.1C108.659 14.14 106.331 11.836 102.299 11.836H99.7066V24.364H102.299ZM118.968 26.764C115.464 26.764 112.824 24.052 112.824 20.5C112.824 16.948 115.464 14.236 118.968 14.236C122.472 14.236 125.112 16.948 125.112 20.5C125.112 24.052 122.472 26.764 118.968 26.764ZM118.968 24.628C121.152 24.628 122.736 22.876 122.736 20.5C122.736 18.124 121.152 16.372 118.968 16.372C116.784 16.372 115.2 18.124 115.2 20.5C115.2 22.876 116.784 24.628 118.968 24.628ZM132.772 26.764C129.22 26.764 126.7 24.124 126.7 20.5C126.7 16.876 129.22 14.236 132.772 14.236C135.652 14.236 137.884 15.964 138.244 18.532H135.844C135.532 17.236 134.332 16.372 132.772 16.372C130.588 16.372 129.076 18.076 129.076 20.5C129.076 22.9 130.588 24.628 132.772 24.628C134.332 24.628 135.532 23.764 135.844 22.468H138.244C137.884 25.036 135.652 26.764 132.772 26.764ZM144.557 26.764C141.677 26.764 139.781 25.108 139.709 22.732H142.085C142.229 23.956 142.973 24.724 144.581 24.724C145.733 24.724 146.765 24.34 146.765 23.332C146.765 22.588 146.333 22.06 145.157 21.7L143.333 21.172C141.173 20.548 140.093 19.3 140.093 17.716C140.093 15.604 141.965 14.236 144.413 14.236C146.885 14.236 148.685 15.7 148.829 17.74H146.453C146.285 16.828 145.445 16.204 144.341 16.204C143.261 16.204 142.469 16.804 142.469 17.716C142.469 18.412 142.925 18.868 144.245 19.228L146.069 19.732C148.109 20.308 149.141 21.556 149.141 23.188C149.141 25.396 147.197 26.764 144.557 26.764Z" fill="black"/><defs><clippath id="clip0_789_1365"><rect width="31.1894" height="36" fill="white"/></clippath></defs></svg></span><span class="MuiButton-endIcon MuiButton-iconSizeMedium css-pt151d"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium css-vubbuv" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="KeyboardArrowDownIcon"><path d="M7.41 8.59 12 13.17l4.59-4.58L18 10l-6 6-6-6 1.41-1.41z"/></svg></span></button></div><div class="css-1w2hxsf"><div class="MuiBox-root css-19itmc6"><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeMedium css-jwr93t" tabindex="0" type="button"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium css-vubbuv" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="TranslateIcon"><path d="m12.87 15.07-2.54-2.51.03-.03c1.74-1.94 2.98-4.17 3.71-6.53H17V4h-7V2H8v2H1v1.99h11.17C11.5 7.92 10.44 9.75 9 11.35 8.07 10.32 7.3 9.19 6.69 8h-2c.73 1.63 1.73 3.17 2.98 4.56l-5.09 5.02L4 19l5-5 3.11 3.11.76-2.04zM18.5 10h-2L12 22h2l1.12-3h4.75L21 22h2l-4.5-12zm-2.62 7 1.62-4.33L19.12 17h-3.24z"/></svg></button><button class="MuiButtonBase-root MuiButton-root MuiButton-text MuiButton-textInherit MuiButton-sizeMedium MuiButton-textSizeMedium MuiButton-colorInherit MuiButton-disableElevation css-1r5wmim" tabindex="0" type="button" id="header-lang-switch" aria-haspopup="true"><span class="MuiButton-startIcon MuiButton-iconSizeMedium css-1l6c7y9"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium css-1msahp5" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="TranslateIcon"><path d="m12.87 15.07-2.54-2.51.03-.03c1.74-1.94 2.98-4.17 3.71-6.53H17V4h-7V2H8v2H1v1.99h11.17C11.5 7.92 10.44 9.75 9 11.35 8.07 10.32 7.3 9.19 6.69 8h-2c.73 1.63 1.73 3.17 2.98 4.56l-5.09 5.02L4 19l5-5 3.11 3.11.76-2.04zM18.5 10h-2L12 22h2l1.12-3h4.75L21 22h2l-4.5-12zm-2.62 7 1.62-4.33L19.12 17h-3.24z"/></svg></span><span class="MuiButton-endIcon MuiButton-iconSizeMedium css-pt151d"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium css-1msahp5" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="KeyboardArrowDownIcon"><path d="M7.41 8.59 12 13.17l4.59-4.58L18 10l-6 6-6-6 1.41-1.41z"/></svg></span></button></div><div class="css-1iegyem"><div class="MuiBox-root css-0"><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeMedium css-iuftj9" tabindex="0" type="button"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium css-vubbuv" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="SearchIcon"><path d="M15.5 14h-.79l-.28-.27C15.41 12.59 16 11.11 16 9.5 16 5.91 13.09 3 9.5 3S3 5.91 3 9.5 5.91 16 9.5 16c1.61 0 3.09-.59 4.23-1.57l.27.28v.79l5 4.99L20.49 19l-4.99-5zm-6 0C7.01 14 5 11.99 5 9.5S7.01 5 9.5 5 14 7.01 14 9.5 11.99 14 9.5 14z"/></svg></button><form class="MuiBox-root css-1dl8tgy" novalidate="" autocomplete="off"><div class="MuiFormControl-root MuiFormControl-fullWidth MuiTextField-root css-7omol5"><div class="MuiInputBase-root MuiOutlinedInput-root MuiInputBase-colorPrimary MuiInputBase-fullWidth MuiInputBase-formControl MuiInputBase-sizeSmall MuiInputBase-adornedStart css-10r6rap"><div class="MuiInputAdornment-root MuiInputAdornment-positionStart MuiInputAdornment-outlined MuiInputAdornment-sizeSmall css-1a6giau"><span class="notranslate"></span><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeSmall css-1k33q06" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="SearchIcon"><path d="M15.5 14h-.79l-.28-.27C15.41 12.59 16 11.11 16 9.5 16 5.91 13.09 3 9.5 3S3 5.91 3 9.5 5.91 16 9.5 16c1.61 0 3.09-.59 4.23-1.57l.27.28v.79l5 4.99L20.49 19l-4.99-5zm-6 0C7.01 14 5 11.99 5 9.5S7.01 5 9.5 5 14 7.01 14 9.5 11.99 14 9.5 14z"/></svg></div><input type="search" aria-invalid="false" id="doc-search" placeholder="搜索文档" value="" class="MuiInputBase-input MuiOutlinedInput-input MuiInputBase-inputTypeSearch MuiInputBase-inputSizeSmall MuiInputBase-inputAdornedStart css-1a7iucg"/><fieldset aria-hidden="true" class="MuiOutlinedInput-notchedOutline css-igs3ac"><legend class="css-hdw1oc"><span class="notranslate"></span></legend></fieldset></div></div></form></div></div></div></div></header><div class="PingCAP-Doc MuiBox-root css-s1brf2"><div class="MuiBox-root css-hboir5"><aside class="MuiBox-root css-2tzg8"><div class="MuiBox-root css-ysaqso"><button class="MuiButtonBase-root MuiButton-root MuiButton-text MuiButton-textPrimary MuiButton-sizeMedium MuiButton-textSizeMedium MuiButton-disableElevation css-1q0sqyi" tabindex="0" type="button" id="version-select-button" aria-haspopup="true"><div class="MuiTypography-root MuiTypography-body1 css-1alj0g7">v8.1</div><span class="MuiButton-endIcon MuiButton-iconSizeMedium css-pt151d"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium css-1rrdqpg" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></span></button><ul role="tree" id="left-nav-treeview" aria-multiselectable="false" class="MuiTreeView-root css-12mehxg" tabindex="0" aria-label="left navigation"><a class="MuiTypography-root MuiTypography-body1 css-ae3kd9" target="_blank" href="https://docs.pingcap.com/zh" style="text-decoration:none;width:100%;color:inherit"><li class="MuiTreeItem-root css-14t19hb" role="treeitem" id="left-nav-treeview-0-0" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-w8t2sr"><div class="MuiBox-root css-3o0h5k"/><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="文档中心">文档中心</div></div></div></div></div></li></a><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-1" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-w8t2sr"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-hkir54" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="关于 TiDB">关于 TiDB</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-2" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-w8t2sr"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-hkir54" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="快速上手">快速上手</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-3" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-w8t2sr"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-hkir54" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="应用开发">应用开发</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-4" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-w8t2sr"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-hkir54" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="部署标准集群">部署标准集群</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-5" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-w8t2sr"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-hkir54" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="数据迁移">数据迁移</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-6" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-w8t2sr"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-hkir54" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="数据集成">数据集成</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-7" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-w8t2sr"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-hkir54" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="运维操作">运维操作</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-8" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-w8t2sr"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-hkir54" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="监控与告警">监控与告警</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-9" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-w8t2sr"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-hkir54" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="故障诊断">故障诊断</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-10" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-w8t2sr"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-hkir54" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="性能调优">性能调优</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-11" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-w8t2sr"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-hkir54" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="教程">教程</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-12" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-w8t2sr"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-hkir54" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="TiDB 工具">TiDB 工具</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="true" id="left-nav-treeview-0-13" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content Mui-expanded" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-w8t2sr"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-13dmm4z" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="参考指南">参考指南</div></div></div></div></div><ul class="MuiCollapse-root MuiCollapse-vertical MuiTreeItem-group MuiCollapse-entered css-1xxsnna" style="min-height:0px" role="group"><div class="MuiCollapse-wrapper MuiCollapse-vertical css-hboir5"><div class="MuiCollapse-wrapperInner MuiCollapse-vertical css-8atqhb"><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-13-0" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-2jyri7"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-hkir54" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="架构">架构</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-13-1" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-2jyri7"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-hkir54" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="存储引擎 TiKV">存储引擎 TiKV</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-13-2" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-2jyri7"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-hkir54" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="存储引擎 TiFlash">存储引擎 TiFlash</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-13-3" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-2jyri7"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-hkir54" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="TiDB 分布式执行框架">TiDB 分布式执行框架</div></div></div></div></div></li><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/system-variables"><li class="MuiTreeItem-root css-14t19hb" role="treeitem" id="left-nav-treeview-0-13-4" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-2jyri7"><div class="MuiBox-root css-3o0h5k"/><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="系统变量">系统变量</div></div></div></div></div></li></a><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/status-variables"><li class="MuiTreeItem-root css-14t19hb" role="treeitem" id="left-nav-treeview-0-13-5" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-2jyri7"><div class="MuiBox-root css-3o0h5k"/><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="服务器状态变量">服务器状态变量</div></div></div></div></div></li></a><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="true" id="left-nav-treeview-0-13-6" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content Mui-expanded" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-2jyri7"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-13dmm4z" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="配置文件参数">配置文件参数</div></div></div></div></div><ul class="MuiCollapse-root MuiCollapse-vertical MuiTreeItem-group MuiCollapse-entered css-1xxsnna" style="min-height:0px" role="group"><div class="MuiCollapse-wrapper MuiCollapse-vertical css-hboir5"><div class="MuiCollapse-wrapperInner MuiCollapse-vertical css-8atqhb"><a aria-current="page" style="text-decoration:none;width:100%;color:inherit" class="" href="/zh/tidb/stable/tidb-configuration-file"><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-selected="true" id="left-nav-treeview-0-13-6-0" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content Mui-expanded Mui-selected" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-xeut16"><div class="MuiBox-root css-3o0h5k"/><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="tidb-server">tidb-server</div></div></div></div></div></li></a><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/tikv-configuration-file"><li class="MuiTreeItem-root css-14t19hb" role="treeitem" id="left-nav-treeview-0-13-6-1" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-xeut16"><div class="MuiBox-root css-3o0h5k"/><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="tikv-server">tikv-server</div></div></div></div></div></li></a><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/tiflash-configuration"><li class="MuiTreeItem-root css-14t19hb" role="treeitem" id="left-nav-treeview-0-13-6-2" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-xeut16"><div class="MuiBox-root css-3o0h5k"/><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="tiflash-server">tiflash-server</div></div></div></div></div></li></a><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/pd-configuration-file"><li class="MuiTreeItem-root css-14t19hb" role="treeitem" id="left-nav-treeview-0-13-6-3" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-xeut16"><div class="MuiBox-root css-3o0h5k"/><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="pd-server">pd-server</div></div></div></div></div></li></a></div></div></ul></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-13-7" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-2jyri7"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-hkir54" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="CLI">CLI</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-13-8" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-2jyri7"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-hkir54" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="命令行参数">命令行参数</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-13-9" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-2jyri7"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-hkir54" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="监控指标">监控指标</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-13-10" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-2jyri7"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-hkir54" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="权限">权限</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-13-11" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-2jyri7"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-hkir54" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="SQL">SQL</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-13-12" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-2jyri7"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-hkir54" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="UI">UI</div></div></div></div></div></li><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/telemetry"><li class="MuiTreeItem-root css-14t19hb" role="treeitem" id="left-nav-treeview-0-13-13" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-2jyri7"><div class="MuiBox-root css-3o0h5k"/><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="遥测">遥测</div></div></div></div></div></li></a><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/error-codes"><li class="MuiTreeItem-root css-14t19hb" role="treeitem" id="left-nav-treeview-0-13-14" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-2jyri7"><div class="MuiBox-root css-3o0h5k"/><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="错误码">错误码</div></div></div></div></div></li></a><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/schedule-replicas-by-topology-labels"><li class="MuiTreeItem-root css-14t19hb" role="treeitem" id="left-nav-treeview-0-13-15" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-2jyri7"><div class="MuiBox-root css-3o0h5k"/><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="通过拓扑 label 进行副本调度">通过拓扑 label 进行副本调度</div></div></div></div></div></li></a><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/external-storage-uri"><li class="MuiTreeItem-root css-14t19hb" role="treeitem" id="left-nav-treeview-0-13-16" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-2jyri7"><div class="MuiBox-root css-3o0h5k"/><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="外部存储服务的 URI 格式">外部存储服务的 URI 格式</div></div></div></div></div></li></a></div></div></ul></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-14" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-w8t2sr"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-hkir54" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="常见问题解答 (FAQ)">常见问题解答 (FAQ)</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-w8t2sr"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-hkir54" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="版本发布历史">版本发布历史</div></div></div></div></div></li><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/glossary"><li class="MuiTreeItem-root css-14t19hb" role="treeitem" id="left-nav-treeview-0-16" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-fhn3dm MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-w8t2sr"><div class="MuiBox-root css-3o0h5k"/><div class="MuiBox-root css-1j9cl4c"><div class="MuiTypography-root MuiTypography-body1 css-1drfgi3" aria-label="术语表">术语表</div></div></div></div></div></li></a></ul></div></aside><main class="MuiBox-root css-sb2sd0"><div class="MuiBox-root css-w0vdto"><div class="css-1q5cbag"><div class="MuiBox-root css-was4pq"><div class="MuiContainer-root MuiContainer-maxWidthLg MuiContainer-disableGutters doc-content css-5csqms"><div class="markdown-body MuiBox-root css-0"><h1 id="tidb-配置文件描述" style="position:relative">TiDB 配置文件描述<a href="#tidb-%E9%85%8D%E7%BD%AE%E6%96%87%E4%BB%B6%E6%8F%8F%E8%BF%B0" aria-label="tidb 配置文件描述 permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h1><p>TiDB 配置文件比命令行参数支持更多的选项。你可以在 <a href="https://github.com/pingcap/tidb/blob/release-8.1/pkg/config/config.toml.example" target="_blank" referrerpolicy="no-referrer-when-downgrade">config/config.toml.example</a> 找到默认值的配置文件，重命名为 <code>config.toml</code> 即可。本文档只介绍未包含在<a href="/zh/tidb/stable/command-line-flags-for-tidb-configuration">命令行参数</a>中的参数。</p><div class="MuiBox-root css-1weqspv"><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardSuccess MuiAlert-standard css-9c4k42" role="alert"><div class="MuiAlert-icon css-1l54tgj"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium css-vubbuv" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="AttachmentIcon"><path d="M2 12.5C2 9.46 4.46 7 7.5 7H18c2.21 0 4 1.79 4 4s-1.79 4-4 4H9.5C8.12 15 7 13.88 7 12.5S8.12 10 9.5 10H17v2H9.41c-.55 0-.55 1 0 1H18c1.1 0 2-.9 2-2s-.9-2-2-2H7.5C5.57 9 4 10.57 4 12.5S5.57 16 7.5 16H17v2H7.5C4.46 18 2 15.54 2 12.5z"/></svg></div><div class="MuiAlert-message css-1xsto0d"><div class="MuiTypography-root MuiTypography-body1 MuiTypography-gutterBottom MuiAlertTitle-root css-m00e13">小贴士</div><p>如果你需要调整配置项的值，请参考<a href="/zh/tidb/stable/maintain-tidb-using-tiup#修改配置参数">修改配置参数</a>进行操作。</p></div></div></div><h3 id="split-table" style="position:relative"><code>split-table</code><a href="#split-table" aria-label="split table permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>为每个 table 建立单独的 Region。</li><li>默认值：true</li><li>如果需要创建大量的表（例如 10 万张以上），建议将此参数设置为 false。</li></ul><h3 id="tidb-max-reuse-chunk-span-classversion-mark从-v640-版本开始引入span" style="position:relative"><code>tidb-max-reuse-chunk</code> <span class="version-mark">从 v6.4.0 版本开始引入</span><a href="#tidb-max-reuse-chunk-span-classversion-mark%E4%BB%8E-v640-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="tidb max reuse chunk span classversion mark从 v640 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>用于控制每个连接最多缓存的 Chunk 对象数。配置过大会增加 OOM 的风险。</li><li>默认值：64</li><li>最小值：0</li><li>最大值：2147483647</li></ul><h3 id="tidb-max-reuse-column-span-classversion-mark从-v640-版本开始引入span" style="position:relative"><code>tidb-max-reuse-column</code> <span class="version-mark">从 v6.4.0 版本开始引入</span><a href="#tidb-max-reuse-column-span-classversion-mark%E4%BB%8E-v640-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="tidb max reuse column span classversion mark从 v640 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>用于控制每个连接最多缓存的 column 对象数。配置过大会增加 OOM 的风险。</li><li>默认值：256</li><li>最小值：0</li><li>最大值：2147483647</li></ul><h3 id="token-limit" style="position:relative"><code>token-limit</code><a href="#token-limit" aria-label="token limit permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>可以同时执行请求的 session 个数</li><li>类型：Integer</li><li>默认值：1000</li><li>最小值：1</li><li>最大值（64 位平台）：<code>18446744073709551615</code></li><li>最大值（32 位平台）：<code>4294967295</code></li></ul><h3 id="temp-dir-span-classversion-mark从-v630-版本开始引入span" style="position:relative"><code>temp-dir</code> <span class="version-mark">从 v6.3.0 版本开始引入</span><a href="#temp-dir-span-classversion-mark%E4%BB%8E-v630-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="temp dir span classversion mark从 v630 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>TiDB 用于存放临时数据的路径。如果一个功能需要使用 TiDB 节点的本地存储，TiDB 将把对应数据临时存放在这个目录下。</li><li>在创建索引的过程中，如果开启了<a href="/zh/tidb/stable/system-variables#tidb_ddl_enable_fast_reorg-从-v630-版本开始引入">创建索引加速</a>，那么新创建索引需要回填的数据会被先存放在 TiDB 本地临时存储路径，然后批量导入到 TiKV，从而提升索引创建速度。</li><li>在使用 <a href="/zh/tidb/stable/sql-statement-import-into"><code>IMPORT INTO</code></a> 导入数据时，排序后的数据会被先存放在 TiDB 本地临时存储路径，然后批量导入到 TiKV。</li><li>默认值："/tmp/tidb"</li></ul><div class="MuiBox-root css-1weqspv"><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardInfo MuiAlert-standard css-1bzshic" role="alert"><div class="MuiAlert-icon css-1l54tgj"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="InfoOutlinedIcon"><path d="M11,9H13V7H11M12,20C7.59,20 4,16.41 4,12C4,7.59 7.59,4 12,4C16.41,4 20,7.59 20, 12C20,16.41 16.41,20 12,20M12,2A10,10 0 0,0 2,12A10,10 0 0,0 12,22A10,10 0 0,0 22,12A10, 10 0 0,0 12,2M11,17H13V11H11V17Z"/></svg></div><div class="MuiAlert-message css-1xsto0d"><div class="MuiTypography-root MuiTypography-body1 MuiTypography-gutterBottom MuiAlertTitle-root css-m00e13">注意</div><p>如果目录不存在，TiDB 在启动时会自动创建该目录。如果目录创建失败，或者 TiDB 对该目录没有读写权限，<a href="/zh/tidb/stable/system-variables#tidb_ddl_enable_fast_reorg-从-v630-版本开始引入">Fast Online DDL</a> 在运行时可能产生不可预知的问题。</p></div></div></div><h3 id="oom-use-tmp-storage" style="position:relative"><code>oom-use-tmp-storage</code><a href="#oom-use-tmp-storage" aria-label="oom use tmp storage permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><div class="MuiBox-root css-1weqspv"><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardError MuiAlert-standard css-kdwypz" role="alert"><div class="MuiAlert-icon css-1l54tgj"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ErrorOutlineIcon"><path d="M11 15h2v2h-2zm0-8h2v6h-2zm.99-5C6.47 2 2 6.48 2 12s4.47 10 9.99 10C17.52 22 22 17.52 22 12S17.52 2 11.99 2zM12 20c-4.42 0-8-3.58-8-8s3.58-8 8-8 8 3.58 8 8-3.58 8-8 8z"/></svg></div><div class="MuiAlert-message css-1xsto0d"><div class="MuiTypography-root MuiTypography-body1 MuiTypography-gutterBottom MuiAlertTitle-root css-m00e13">警告</div><p>自 v6.3.0 起，该配置项被废弃，其功能由系统变量 <a href="/zh/tidb/stable/system-variables#tidb_enable_tmp_storage_on_oom"><code>tidb_enable_tmp_storage_on_oom</code></a> 代替。集群升级到 v6.3.0 及之后的版本后，会自动继承升级前的 <code>oom-use-tmp-storage</code> 设置，升级后再设置 <code>oom-use-tmp-storage</code> 将不生效。</p></div></div></div><ul><li>设置是否在单条 SQL 语句的内存使用超出系统变量 <a href="/zh/tidb/stable/system-variables#tidb_mem_quota_query"><code>tidb_mem_quota_query</code></a> 限制时为某些算子启用临时磁盘。</li><li>默认值：true</li></ul><h3 id="tmp-storage-path" style="position:relative"><code>tmp-storage-path</code><a href="#tmp-storage-path" aria-label="tmp storage path permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>单条 SQL 语句的内存使用超出系统变量 <a href="/zh/tidb/stable/system-variables#tidb_mem_quota_query"><code>tidb_mem_quota_query</code></a> 限制时，某些算子的临时磁盘存储位置。</li><li>默认值：<code>&lt;操作系统临时文件夹&gt;/&lt;操作系统用户ID&gt;_tidb/MC4wLjAuMDo0MDAwLzAuMC4wLjA6MTAwODA=/tmp-storage</code>。其中 <code>MC4wLjAuMDo0MDAwLzAuMC4wLjA6MTAwODA=</code> 是对 <code>&lt;host&gt;:&lt;port&gt;/&lt;statusHost&gt;:&lt;statusPort&gt;</code> 进行 <code>Base64</code> 编码的输出结果。</li><li>此配置仅在系统变量 <a href="/zh/tidb/stable/system-variables#tidb_enable_tmp_storage_on_oom"><code>tidb_enable_tmp_storage_on_oom</code></a> 的值为 <code>ON</code> 时有效。</li></ul><h3 id="tmp-storage-quota" style="position:relative"><code>tmp-storage-quota</code><a href="#tmp-storage-quota" aria-label="tmp storage quota permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li><code>tmp-storage-path</code> 存储使用的限额。</li><li>单位：Byte</li><li>当单条 SQL 语句使用临时磁盘，导致 TiDB server 的总体临时磁盘总量超过 <code>tmp-storage-quota</code> 时，当前 SQL 操作会被取消，并返回 <code>Out Of Global Storage Quota!</code> 错误。</li><li>当 <code>tmp-storage-quota</code> 小于 0 时则没有上述检查与限制。</li><li>默认值：-1</li><li>当 <code>tmp-storage-path</code> 的剩余可用容量低于 <code>tmp-storage-quota</code> 所定义的值时，TiDB server 启动时将会报出错误并退出。</li></ul><h3 id="lease" style="position:relative"><code>lease</code><a href="#lease" aria-label="lease permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>DDL 租约超时时间。</li><li>默认值：45s</li><li>单位：秒</li></ul><h3 id="compatible-kill-query" style="position:relative"><code>compatible-kill-query</code><a href="#compatible-kill-query" aria-label="compatible kill query permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>设置 <code>KILL</code> 语句的兼容性。</li><li>默认值：false</li><li><code>compatible-kill-query</code> 仅在 <a href="#enable-global-kill-%E4%BB%8E-v610-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5"><code>enable-global-kill</code></a> 为 <code>false</code> 时生效。</li><li>当 <a href="#enable-global-kill-%E4%BB%8E-v610-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5"><code>enable-global-kill</code></a> 为 <code>false</code> 时，<code>compatible-kill-query</code> 控制杀死一条查询时是否需要加上 <code>TIDB</code> 关键词。<ul><li><code>compatible-kill-query</code> 为 <code>false</code> 时，TiDB 中 <code>KILL xxx</code> 的行为和 MySQL 中的行为不同。为杀死一条查询，在 TiDB 中需要加上 <code>TIDB</code> 关键词，即 <code>KILL TIDB xxx</code>。</li><li><code>compatible-kill-query</code> 为 <code>true</code> 时，为杀死一条查询，在 TiDB 中无需加上 <code>TIDB</code> 关键词。<strong>强烈不建议</strong>设置 <code>compatible-kill-query</code> 为 <code>true</code>，<strong>除非</strong>你确定客户端将始终连接到同一个 TiDB 节点。这是因为当你在默认的 MySQL 客户端按下 <kbd>Control</kbd>+<kbd>C</kbd> 时，客户端会开启一个新连接，并在这个新连接中执行 <code>KILL</code> 语句。此时，如果客户端和 TiDB 之间存在代理，新连接可能会被路由到其他 TiDB 节点，从而错误地终止其他会话。</li></ul></li><li>当 <a href="#enable-global-kill-%E4%BB%8E-v610-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5"><code>enable-global-kill</code></a> 为 <code>true</code> 时，<code>KILL xxx</code> 和 <code>KILL TIDB xxx</code> 的作用相同。</li><li>关于 <code>KILL</code> 语句的更多信息，请参考 <a href="/zh/tidb/stable/sql-statement-kill">KILL [TIDB]</a>。</li></ul><h3 id="check-mb4-value-in-utf8" style="position:relative"><code>check-mb4-value-in-utf8</code><a href="#check-mb4-value-in-utf8" aria-label="check mb4 value in utf8 permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>开启检查 utf8mb4 字符的开关，如果开启此功能，字符集是 utf8，且在 utf8 插入 mb4 字符，系统将会报错。</li><li>默认值：true</li><li>自 v6.1.0 起，utf8mb4 字符检查改为通过 TiDB 配置项 <code>instance.tidb_check_mb4_value_in_utf8</code> 或系统变量 <code>tidb_check_mb4_value_in_utf8</code> 进行设置。<code>check-mb4-value-in-utf8</code> 仍可使用，但如果同时设置了 <code>check-mb4-value-in-utf8</code> 与 <code>instance.tidb_check_mb4_value_in_utf8</code>，TiDB 将采用 <code>instance.tidb_check_mb4_value_in_utf8</code> 的值。</li></ul><h3 id="treat-old-version-utf8-as-utf8mb4" style="position:relative"><code>treat-old-version-utf8-as-utf8mb4</code><a href="#treat-old-version-utf8-as-utf8mb4" aria-label="treat old version utf8 as utf8mb4 permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>将旧表中的 utf8 字符集当成 utf8mb4 的开关。</li><li>默认值：true</li></ul><h3 id="alter-primary-key已废弃" style="position:relative"><code>alter-primary-key</code>（已废弃）<a href="#alter-primary-key%E5%B7%B2%E5%BA%9F%E5%BC%83" aria-label="alter primary key已废弃 permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>用于控制添加或者删除主键功能。</li><li>默认值：false</li><li>默认情况下，不支持增删主键。将此变量被设置为 true 后，支持增删主键功能。不过对在此开关开启前已经存在的表，且主键是整型类型时，即使之后开启此开关也不支持对此列表删除主键。</li></ul><div class="MuiBox-root css-1weqspv"><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardInfo MuiAlert-standard css-1bzshic" role="alert"><div class="MuiAlert-icon css-1l54tgj"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="InfoOutlinedIcon"><path d="M11,9H13V7H11M12,20C7.59,20 4,16.41 4,12C4,7.59 7.59,4 12,4C16.41,4 20,7.59 20, 12C20,16.41 16.41,20 12,20M12,2A10,10 0 0,0 2,12A10,10 0 0,0 12,22A10,10 0 0,0 22,12A10, 10 0 0,0 12,2M11,17H13V11H11V17Z"/></svg></div><div class="MuiAlert-message css-1xsto0d"><div class="MuiTypography-root MuiTypography-body1 MuiTypography-gutterBottom MuiAlertTitle-root css-m00e13">注意</div><p>该配置项已被废弃，目前仅在 <code>@@tidb_enable_clustered_index</code> 取值为 <code>INT_ONLY</code> 时生效。如果需要增删主键，请在建表时使用 <code>NONCLUSTERED</code> 关键字代替。要了解关于 <code>CLUSTERED</code> 主键的详细信息，请参考<a href="/zh/tidb/stable/clustered-indexes">聚簇索引</a>。</p></div></div></div><h3 id="server-version" style="position:relative"><code>server-version</code><a href="#server-version" aria-label="server version permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>用来修改 TiDB 在以下情况下返回的版本号：<ul><li>当使用内置函数 <code>VERSION()</code> 时。</li><li>当与客户端初始连接，TiDB 返回带有服务端版本号的初始握手包时。具体可以查看 MySQL 初始握手包的<a href="https://dev.mysql.com/doc/dev/mysql-server/latest/page_protocol_connection_phase.html#sect_protocol_connection_phase_initial_handshake" target="_blank" referrerpolicy="no-referrer-when-downgrade">描述</a>。</li></ul></li><li>默认值：""</li><li>默认情况下，TiDB 版本号格式为：<code>8.0.11-TiDB-${tidb_version}</code>。</li></ul><div class="MuiBox-root css-1weqspv"><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardInfo MuiAlert-standard css-1bzshic" role="alert"><div class="MuiAlert-icon css-1l54tgj"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="InfoOutlinedIcon"><path d="M11,9H13V7H11M12,20C7.59,20 4,16.41 4,12C4,7.59 7.59,4 12,4C16.41,4 20,7.59 20, 12C20,16.41 16.41,20 12,20M12,2A10,10 0 0,0 2,12A10,10 0 0,0 12,22A10,10 0 0,0 22,12A10, 10 0 0,0 12,2M11,17H13V11H11V17Z"/></svg></div><div class="MuiAlert-message css-1xsto0d"><div class="MuiTypography-root MuiTypography-body1 MuiTypography-gutterBottom MuiAlertTitle-root css-m00e13">注意</div><p><code>server-version</code> 的值会被 TiDB 节点用于验证当前 TiDB 的版本。因此在进行 TiDB 集群升级前，请将 <code>server-version</code> 的值设置为空或者当前 TiDB 真实的版本值，避免出现非预期行为。</p></div></div></div><h3 id="repair-mode" style="position:relative"><code>repair-mode</code><a href="#repair-mode" aria-label="repair mode permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>用于开启非可信修复模式，启动该模式后，可以过滤 <code>repair-table-list</code> 名单中坏表的加载。</li><li>默认值：false</li><li>默认情况下，不支持修复语法，默认启动时会加载所有表信息。</li></ul><h3 id="repair-table-list" style="position:relative"><code>repair-table-list</code><a href="#repair-table-list" aria-label="repair table list permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>配合 <code>repair-mode</code> 为 true 时使用，用于列出实例中需要修复的坏表的名单，该名单的写法为 ["db.table1","db.table2", ……]。</li><li>默认值：[]</li><li>默认情况下，该 list 名单为空，表示没有所需修复的坏表信息。</li></ul><h3 id="new_collations_enabled_on_first_bootstrap" style="position:relative"><code>new_collations_enabled_on_first_bootstrap</code><a href="#new_collations_enabled_on_first_bootstrap" aria-label="new_collations_enabled_on_first_bootstrap permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>用于开启新的 collation 支持</li><li>默认值：true</li><li>注意：该配置项只有在初次初始化集群时生效，初始化集群后，无法通过更改该配置项打开或关闭新的 collation 框架。</li></ul><h3 id="max-server-connections" style="position:relative"><code>max-server-connections</code><a href="#max-server-connections" aria-label="max server connections permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>TiDB 中同时允许的最大客户端连接数，用于资源控制。</li><li>默认值：0</li><li>默认情况下，TiDB 不限制客户端连接数。当本配置项的值大于 <code>0</code> 且客户端连接数到达此值时，TiDB 服务端将会拒绝新的客户端连接。</li><li>自 v6.2.0 起，客户端连接数已改用配置项 <a href="/zh/tidb/stable/tidb-configuration-file#max_connections"><code>instance.max_connections</code></a> 或系统变量 <a href="/zh/tidb/stable/system-variables#max_connections"><code>max_connections</code></a> 进行设置。<code>max-server-connections</code> 仍可使用，但如果同时设置了 <code>max-server-connections</code> 与 <code>instance.max_connections</code>，TiDB 将采用 <code>instance.max_connections</code> 的值。</li></ul><h3 id="max-index-length" style="position:relative"><code>max-index-length</code><a href="#max-index-length" aria-label="max index length permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>用于设置新建索引的长度限制。</li><li>默认值：3072</li><li>单位：Byte</li><li>目前的合法值范围 <code>[3072, 3072*4]</code>。MySQL 和 TiDB v3.0.11 之前版本（不包含 v3.0.11）没有此配置项，不过都对新建索引的长度做了限制。MySQL 对此的长度限制为 <code>3072</code>，TiDB 在 v3.0.7 以及之前版本该值为 <code>3072*4</code>，在 v3.0.7 之后版本（包含 v3.0.8、v3.0.9 和 v3.0.10）的该值为 <code>3072</code>。为了与 MySQL 和 TiDB 之前版本的兼容，添加了此配置项。</li></ul><h3 id="table-column-count-limit-span-classversion-mark从-v50-版本开始引入span" style="position:relative"><code>table-column-count-limit</code> <span class="version-mark">从 v5.0 版本开始引入</span><a href="#table-column-count-limit-span-classversion-mark%E4%BB%8E-v50-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="table column count limit span classversion mark从 v50 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>用于设置单个表中列的数量限制</li><li>默认值：1017</li><li>目前的合法值范围 <code>[1017, 4096]</code>。</li></ul><h3 id="index-limit-span-classversion-mark从-v50-版本开始引入span" style="position:relative"><code>index-limit</code> <span class="version-mark">从 v5.0 版本开始引入</span><a href="#index-limit-span-classversion-mark%E4%BB%8E-v50-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="index limit span classversion mark从 v50 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>用于设置单个表中索引的数量限制</li><li>默认值：64</li><li>目前的合法值范围 <code>[64, 512]</code>。</li></ul><h3 id="enable-telemetry-span-classversion-mark从-v402-版本开始引入从-v810-版本开始废弃span" style="position:relative"><code>enable-telemetry</code> <span class="version-mark">从 v4.0.2 版本开始引入，从 v8.1.0 版本开始废弃</span><a href="#enable-telemetry-span-classversion-mark%E4%BB%8E-v402-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5%E4%BB%8E-v810-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BA%9F%E5%BC%83span" aria-label="enable telemetry span classversion mark从 v402 版本开始引入从 v810 版本开始废弃span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><div class="MuiBox-root css-1weqspv"><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardError MuiAlert-standard css-kdwypz" role="alert"><div class="MuiAlert-icon css-1l54tgj"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ErrorOutlineIcon"><path d="M11 15h2v2h-2zm0-8h2v6h-2zm.99-5C6.47 2 2 6.48 2 12s4.47 10 9.99 10C17.52 22 22 17.52 22 12S17.52 2 11.99 2zM12 20c-4.42 0-8-3.58-8-8s3.58-8 8-8 8 3.58 8 8-3.58 8-8 8z"/></svg></div><div class="MuiAlert-message css-1xsto0d"><div class="MuiTypography-root MuiTypography-body1 MuiTypography-gutterBottom MuiAlertTitle-root css-m00e13">警告</div><p>从 TiDB v8.1.0 开始，TiDB 已移除遥测功能，该配置项已不再生效。保留该配置项仅用于与之前版本兼容。</p></div></div></div><ul><li>在 v8.1.0 之前，用于控制是否在 TiDB 实例上开启遥测功能。</li><li>默认值：false</li></ul><h3 id="deprecate-integer-display-length" style="position:relative"><code>deprecate-integer-display-length</code><a href="#deprecate-integer-display-length" aria-label="deprecate integer display length permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>当此配置项设置为 <code>true</code> 时，弃用整数类型的显示宽度。</li><li>默认值：<code>false</code></li></ul><h3 id="enable-tcp4-only-span-classversion-mark从-v50-版本开始引入span" style="position:relative"><code>enable-tcp4-only</code> <span class="version-mark">从 v5.0 版本开始引入</span><a href="#enable-tcp4-only-span-classversion-mark%E4%BB%8E-v50-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="enable tcp4 only span classversion mark从 v50 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>控制是否只监听 TCP4。</li><li>默认值：false</li><li>当使用 LVS 为 TiDB 做负载均衡时，可开启此配置项。这是因为 <a href="https://github.com/alibaba/LVS/tree/master/kernel/net/toa" target="_blank" referrerpolicy="no-referrer-when-downgrade">LVS 的 TOA 模块</a>可以通过 TCP4 协议从 TCP 头部信息中解析出客户端的真实 IP。</li></ul><h3 id="enable-enum-length-limit-span-classversion-mark从-v50-版本开始引入span" style="position:relative"><code>enable-enum-length-limit</code> <span class="version-mark">从 v5.0 版本开始引入</span><a href="#enable-enum-length-limit-span-classversion-mark%E4%BB%8E-v50-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="enable enum length limit span classversion mark从 v50 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>是否限制单个 <code>ENUM</code> 元素和单个 <code>SET</code> 元素的最大长度</li><li>默认值：true</li><li>当该配置项值为 <code>true</code> 时，<code>ENUM</code> 和 <code>SET</code> 单个元素的最大长度为 255 个字符，<a href="https://dev.mysql.com/doc/refman/8.0/en/string-type-syntax.html" target="_blank" referrerpolicy="no-referrer-when-downgrade">与 MySQL 8 兼容</a>；当该配置项值为 <code>false</code> 时，不对单个元素的长度进行限制，与 TiDB v5.0 之前的版本兼容。</li></ul><h3 id="graceful-wait-before-shutdown-span-classversion-mark从-v50-版本开始引入span" style="position:relative"><code>graceful-wait-before-shutdown</code> <span class="version-mark">从 v5.0 版本开始引入</span><a href="#graceful-wait-before-shutdown-span-classversion-mark%E4%BB%8E-v50-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="graceful wait before shutdown span classversion mark从 v50 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>指定关闭服务器时 TiDB 等待的秒数，使得客户端有时间断开连接。</li><li>默认值：0</li><li>在 TiDB 等待服务器关闭期间，HTTP 状态会显示失败，使得负载均衡器可以重新路由流量。</li></ul><div class="MuiBox-root css-1weqspv"><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardInfo MuiAlert-standard css-1bzshic" role="alert"><div class="MuiAlert-icon css-1l54tgj"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="InfoOutlinedIcon"><path d="M11,9H13V7H11M12,20C7.59,20 4,16.41 4,12C4,7.59 7.59,4 12,4C16.41,4 20,7.59 20, 12C20,16.41 16.41,20 12,20M12,2A10,10 0 0,0 2,12A10,10 0 0,0 12,22A10,10 0 0,0 22,12A10, 10 0 0,0 12,2M11,17H13V11H11V17Z"/></svg></div><div class="MuiAlert-message css-1xsto0d"><div class="MuiTypography-root MuiTypography-body1 MuiTypography-gutterBottom MuiAlertTitle-root css-m00e13">注意</div><p>TiDB 在关闭服务器之前等待的时长也会受到以下参数的影响：</p><ul><li><p>当使用的平台采用了 SystemD 时，默认的停止超时为 90 秒。如果需要更长的超时时间，可以设置 <a href="https://www.freedesktop.org/software/systemd/man/latest/systemd.service.html#TimeoutStopSec=" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>TimeoutStopSec=</code></a>。</p></li><li><p>当使用 TiUP Cluster 组件时，默认的 <a href="/zh/tidb/stable/tiup-component-cluster#--wait-timeoutuint默认-120"><code>--wait-timeout</code></a> 为 120 秒。</p></li><li><p>当使用 Kubernetes 时，默认的 <a href="https://kubernetes.io/docs/reference/kubernetes-api/workload-resources/pod-v1/#lifecycle" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>terminationGracePeriodSeconds</code></a> 为 30 秒。</p></li></ul></div></div></div><h3 id="enable-global-kill-span-classversion-mark从-v610-版本开始引入span" style="position:relative"><code>enable-global-kill</code> <span class="version-mark">从 v6.1.0 版本开始引入</span><a href="#enable-global-kill-span-classversion-mark%E4%BB%8E-v610-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="enable global kill span classversion mark从 v610 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>用于开启 Global Kill（跨节点终止查询或连接）功能。</li><li>默认值：true</li><li>当该配置项值为 <code>true</code> 时，<code>KILL</code> 语句和 <code>KILL TIDB</code> 语句均能跨节点终止查询或连接，无需担心错误地终止其他查询或连接。当你使用客户端连接到任何一个 TiDB 节点执行 <code>KILL</code> 语句或 <code>KILL TIDB</code> 语句时，该语句会被转发给对应的 TiDB 节点。当客户端和 TiDB 中间有代理时，<code>KILL</code> 语句或 <code>KILL TIDB</code> 语句也会被转发给对应的 TiDB 节点执行。关于 <code>KILL</code> 语句的更多信息，请参考 <a href="/zh/tidb/stable/sql-statement-kill"><code>KILL [TIDB]</code></a>。</li><li>TiDB 从 v7.3.0 开始支持在 <code>enable-global-kill = true</code> 和 <a href="#enable-32bits-connection-id-%E4%BB%8E-v730-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5"><code>enable-32bits-connection-id = true</code></a> 时使用 MySQL 命令行 <kbd>Control+C</kbd> 终止查询或连接。</li></ul><h3 id="enable-32bits-connection-id-span-classversion-mark从-v730-版本开始引入span" style="position:relative"><code>enable-32bits-connection-id</code> <span class="version-mark">从 v7.3.0 版本开始引入</span><a href="#enable-32bits-connection-id-span-classversion-mark%E4%BB%8E-v730-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="enable 32bits connection id span classversion mark从 v730 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>用于控制是否开启生成 32 位 connection ID 的功能。</li><li>默认值：<code>true</code></li><li>当该配置项值以及 <a href="#enable-global-kill-%E4%BB%8E-v610-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5"><code>enable-global-kill</code></a> 为 <code>true</code> 时，生成 32 位 connection ID，从而支持在 MySQL 命令行中通过 <kbd>Control+C</kbd> 终止查询或连接。</li></ul><div class="MuiBox-root css-1weqspv"><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardInfo MuiAlert-standard css-1bzshic" role="alert"><div class="MuiAlert-icon css-1l54tgj"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="InfoOutlinedIcon"><path d="M11,9H13V7H11M12,20C7.59,20 4,16.41 4,12C4,7.59 7.59,4 12,4C16.41,4 20,7.59 20, 12C20,16.41 16.41,20 12,20M12,2A10,10 0 0,0 2,12A10,10 0 0,0 12,22A10,10 0 0,0 22,12A10, 10 0 0,0 12,2M11,17H13V11H11V17Z"/></svg></div><div class="MuiAlert-message css-1xsto0d"><div class="MuiTypography-root MuiTypography-body1 MuiTypography-gutterBottom MuiAlertTitle-root css-m00e13">注意</div><p>当集群中 TiDB 实例数量超过 2048 或者单个 TiDB 实例的同时连接数超过 1048576 后，由于 32 位 connection ID 空间不足，将自动升级为 64 位 connection ID。升级过程中业务以及已建立的连接不受影响，但后续的新建连接将无法通过 MySQL 命令行 <kbd>Control+C</kbd> 终止。</p></div></div></div><h3 id="initialize-sql-file-span-classversion-mark从-v660-版本开始引入span" style="position:relative"><code>initialize-sql-file</code> <span class="version-mark">从 v6.6.0 版本开始引入</span><a href="#initialize-sql-file-span-classversion-mark%E4%BB%8E-v660-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="initialize sql file span classversion mark从 v660 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>用于指定 TiDB 集群初次启动时执行的 SQL 脚本。</li><li>默认值：""</li><li>脚本中的所有 SQL 语句将以最高权限执行，不会进行权限检查。若指定的 SQL 脚本无法正确执行，可能导致 TiDB 集群启动失败。</li><li>通常用于修改系统变量的值、创建用户或分配权限等。</li></ul><h3 id="enable-forwarding-span-classversion-mark从-v500-版本开始引入span" style="position:relative"><code>enable-forwarding</code> <span class="version-mark">从 v5.0.0 版本开始引入</span><a href="#enable-forwarding-span-classversion-mark%E4%BB%8E-v500-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="enable forwarding span classversion mark从 v500 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>控制 TiDB 中的 PD client 以及 TiKV client 在疑似网络隔离的情况下是否通过 follower 将请求转发给 leader。</li><li>默认值：false</li><li>如果确认环境存在网络隔离的可能，开启这个参数可以减少服务不可用的窗口期。</li><li>如果无法准确判断隔离、网络中断、宕机等情况，这个机制存在误判情况从而导致可用性、性能降低。如果网络中从未发生过网络故障，不推荐开启此选项。</li></ul><h3 id="enable-table-lock-span-classversion-mark从-v400-版本开始引入span" style="position:relative"><code>enable-table-lock</code> <span class="version-mark">从 v4.0.0 版本开始引入</span><a href="#enable-table-lock-span-classversion-mark%E4%BB%8E-v400-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="enable table lock span classversion mark从 v400 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><div class="MuiBox-root css-1weqspv"><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardError MuiAlert-standard css-kdwypz" role="alert"><div class="MuiAlert-icon css-1l54tgj"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ErrorOutlineIcon"><path d="M11 15h2v2h-2zm0-8h2v6h-2zm.99-5C6.47 2 2 6.48 2 12s4.47 10 9.99 10C17.52 22 22 17.52 22 12S17.52 2 11.99 2zM12 20c-4.42 0-8-3.58-8-8s3.58-8 8-8 8 3.58 8 8-3.58 8-8 8z"/></svg></div><div class="MuiAlert-message css-1xsto0d"><div class="MuiTypography-root MuiTypography-body1 MuiTypography-gutterBottom MuiAlertTitle-root css-m00e13">警告</div><p>表级锁 (Table Lock) 为实验特性，不建议在生产环境中使用。</p></div></div></div><ul><li>控制是否开启表级锁特性。</li><li>默认值：false</li><li>表级锁用于协调多个 session 之间对同一张表的并发访问。目前已支持的锁种类包括 <code>READ</code>、<code>WRITE</code> 和 <code>WRITE LOCAL</code>。当该配置项为 <code>false</code> 时，执行 <code>LOCK TABLES</code> 和 <code>UNLOCK TABLES</code> 语句不会生效，并且会报 "LOCK/UNLOCK TABLES is not supported" 的警告。更多信息，请参考 <a href="/zh/tidb/stable/sql-statement-lock-tables-and-unlock-tables"><code>LOCK TABLES</code> 和 <code>UNLOCK TABLES</code></a>。</li></ul><h3 id="labels" style="position:relative"><code>labels</code><a href="#labels" aria-label="labels permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>指定服务器标签，例如 <code>{ zone = "us-west-1", dc = "dc1", rack = "rack1", host = "tidb1" }</code>。</li><li>默认值：<code>{}</code></li></ul><div class="MuiBox-root css-1weqspv"><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardInfo MuiAlert-standard css-1bzshic" role="alert"><div class="MuiAlert-icon css-1l54tgj"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="InfoOutlinedIcon"><path d="M11,9H13V7H11M12,20C7.59,20 4,16.41 4,12C4,7.59 7.59,4 12,4C16.41,4 20,7.59 20, 12C20,16.41 16.41,20 12,20M12,2A10,10 0 0,0 2,12A10,10 0 0,0 12,22A10,10 0 0,0 22,12A10, 10 0 0,0 12,2M11,17H13V11H11V17Z"/></svg></div><div class="MuiAlert-message css-1xsto0d"><div class="MuiTypography-root MuiTypography-body1 MuiTypography-gutterBottom MuiAlertTitle-root css-m00e13">注意</div><ul><li>标签 <code>zone</code> 在 TiDB 中具有特殊用途，用于指定服务器所在的区域信息，当设置 <code>zone</code> 为非空值时，对应的值会被自动用于 <a href="/zh/tidb/stable/system-variables#txn_scope"><code>txn-score</code></a> 和 <a href="/zh/tidb/stable/follower-read"><code>Follower read</code></a> 等功能。</li><li>标签 <code>group</code> 在 TiDB Operator 中具有特殊用途。对于使用 <a href="/zh/tidb/stable/tidb-operator-overview">TiDB Operator</a> 部署的集群，建议不要手动指定此标签。</li></ul></div></div></div><h2 id="log" style="position:relative">log<a href="#log" aria-label="log permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h2><p>日志相关的配置项。</p><h3 id="level" style="position:relative"><code>level</code><a href="#level" aria-label="level permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>指定日志的输出级别，可选项为 [debug, info, warn, error, fatal]</li><li>默认值："info"</li></ul><h3 id="format" style="position:relative"><code>format</code><a href="#format" aria-label="format permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>指定日志输出的格式，可选项为 [json, text]。</li><li>默认值："text"</li></ul><h3 id="enable-timestamp" style="position:relative"><code>enable-timestamp</code><a href="#enable-timestamp" aria-label="enable timestamp permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>是否在日志中输出时间戳。</li><li>默认值：null</li><li>如果设置为 false，那么日志里面将不会输出时间戳。</li></ul><div class="MuiBox-root css-1weqspv"><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardInfo MuiAlert-standard css-1bzshic" role="alert"><div class="MuiAlert-icon css-1l54tgj"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="InfoOutlinedIcon"><path d="M11,9H13V7H11M12,20C7.59,20 4,16.41 4,12C4,7.59 7.59,4 12,4C16.41,4 20,7.59 20, 12C20,16.41 16.41,20 12,20M12,2A10,10 0 0,0 2,12A10,10 0 0,0 12,22A10,10 0 0,0 22,12A10, 10 0 0,0 12,2M11,17H13V11H11V17Z"/></svg></div><div class="MuiAlert-message css-1xsto0d"><div class="MuiTypography-root MuiTypography-body1 MuiTypography-gutterBottom MuiAlertTitle-root css-m00e13">注意</div><ul><li>考虑后向兼容性，原来的配置项 <code>disable-timestamp</code> 仍然有效，但如果和 <code>enable-timestamp</code> 配置的值在语义上冲突（例如在配置中把 <code>enable-timestamp</code> 和 <code>disable-timestamp</code> 同时设置为 <code>true</code>），则 TiDB 会忽略 <code>disable-timestamp</code> 的值。</li><li>当前 TiDB 默认使用 <code>disable-timestamp</code> 来决定是否在日志中输出时间戳，此时 <code>enable-timestamp</code> 的值为 <code>null</code>。</li><li>在未来的版本中，<code>disable-timestamp</code> 配置项将被彻底移除，请废弃 <code>disable-timestamp</code> 的用法，使用语义上更易于理解的 <code>enable-timestamp</code>。</li></ul></div></div></div><h3 id="enable-slow-log" style="position:relative"><code>enable-slow-log</code><a href="#enable-slow-log" aria-label="enable slow log permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>是否开启慢查询日志</li><li>默认值：true</li><li>可以设置成 <code>true</code> 或 <code>false</code> 来启用或禁用慢查询日志。</li><li>自 v6.1.0 起，已改用配置项 <code>instance.tidb_enable_slow_log</code> 或系统变量 <code>tidb_enable_slow_log</code> 来设置是否开启慢查询日志。<code>enable-slow-log</code> 仍可使用，但如果同时设置了 <code>enable-slow-log</code> 与 <code>instance.tidb_enable_slow_log</code>，TiDB 将采用 <code>instance.tidb_enable_slow_log</code> 的值。</li></ul><h3 id="slow-query-file" style="position:relative"><code>slow-query-file</code><a href="#slow-query-file" aria-label="slow query file permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>慢查询日志的文件名。</li><li>默认值："tidb-slow.log"。注：由于 TiDB V2.1.8 更新了慢日志格式，所以将慢日志单独输出到了慢日志文件。V2.1.8 之前的版本，该变量的默认值是 ""。</li><li>设置后，慢查询日志会单独输出到该文件。</li></ul><h3 id="slow-threshold" style="position:relative"><code>slow-threshold</code><a href="#slow-threshold" aria-label="slow threshold permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>输出慢日志的耗时阈值。</li><li>默认值：300</li><li>单位：毫秒</li><li>如果查询耗时大于这个值，会视作一个慢查询，并记录到慢查询日志。注意，当日志的输出级别 <a href="#level"><code>log.level</code></a> 是 <code>"debug"</code> 时，所有查询都会记录到慢日志，不受该参数的限制。</li><li>自 v6.1.0 起，已改用配置项 <code>instance.tidb_slow_log_threshold</code> 或系统变量 <code>tidb_slow_log_threshold</code> 来设置输出慢日志的耗时阈值。<code>slow-threshold</code> 仍可使用，但如果同时设置了 <code>slow-threshold</code> 与 <code>instance.tidb_slow_log_threshold</code>，TiDB 将采用 <code>instance.tidb_slow_log_threshold</code> 的值。</li></ul><h3 id="record-plan-in-slow-log" style="position:relative"><code>record-plan-in-slow-log</code><a href="#record-plan-in-slow-log" aria-label="record plan in slow log permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>在慢日志中记录执行计划</li><li>默认值：1</li><li>自 v6.1.0 起，已改用配置项 <a href="/zh/tidb/stable/tidb-configuration-file#tidb_record_plan_in_slow_log"><code>instance.tidb_record_plan_in_slow_log</code></a> 或系统变量 <a href="/zh/tidb/stable/system-variables#tidb_record_plan_in_slow_log"><code>tidb_record_plan_in_slow_log</code></a> 来设置在慢日志中记录执行计划。<code>record-plan-in-slow-log</code> 仍可使用，但如果同时设置了 <code>record-plan-in-slow-log</code> 与 <code>instance.tidb_record_plan_in_slow_log</code>，TiDB 将采用 <code>instance.tidb_record_plan_in_slow_log</code> 的值。</li></ul><h3 id="expensive-threshold" style="position:relative"><code>expensive-threshold</code><a href="#expensive-threshold" aria-label="expensive threshold permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><div class="MuiBox-root css-1weqspv"><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardError MuiAlert-standard css-kdwypz" role="alert"><div class="MuiAlert-icon css-1l54tgj"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ErrorOutlineIcon"><path d="M11 15h2v2h-2zm0-8h2v6h-2zm.99-5C6.47 2 2 6.48 2 12s4.47 10 9.99 10C17.52 22 22 17.52 22 12S17.52 2 11.99 2zM12 20c-4.42 0-8-3.58-8-8s3.58-8 8-8 8 3.58 8 8-3.58 8-8 8z"/></svg></div><div class="MuiAlert-message css-1xsto0d"><div class="MuiTypography-root MuiTypography-body1 MuiTypography-gutterBottom MuiAlertTitle-root css-m00e13">警告</div><p>自 v5.4.0 起，该配置项被废弃。请使用 <a href="/zh/tidb/stable/system-variables#tidb_expensive_query_time_threshold"><code>tidb_expensive_query_time_threshold</code></a> 系统变量进行设置。</p></div></div></div><ul><li>输出 <code>expensive</code> 操作的行数阈值。</li><li>默认值：10000</li><li>当查询的行数（包括中间结果，基于统计信息）大于这个值，该操作会被认为是 <code>expensive</code> 查询，并输出一个前缀带有 <code>[EXPENSIVE_QUERY]</code> 的日志。</li></ul><h3 id="general-log-file-span-classversion-mark从-v800-版本开始引入span" style="position:relative"><code>general-log-file</code> <span class="version-mark">从 v8.0.0 版本开始引入</span><a href="#general-log-file-span-classversion-mark%E4%BB%8E-v800-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="general log file span classversion mark从 v800 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>设置 <a href="/zh/tidb/stable/system-variables#tidb_general_log">general log</a> 的文件名。</li><li>默认值：""</li><li>如果设置了文件名，general log 会输出到指定的文件。如没有设置文件名，general log 会写入 TiDB 实例的日志文件中，该文件名通过 <a href="#filename"><code>filename</code></a> 指定。</li></ul><h3 id="timeout-span-classversion-mark从-v710-版本开始引入span" style="position:relative"><code>timeout</code> <span class="version-mark">从 v7.1.0 版本开始引入</span><a href="#timeout-span-classversion-mark%E4%BB%8E-v710-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="timeout span classversion mark从 v710 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>用于设置 TiDB 写日志操作的超时时间。当磁盘故障导致日志无法写入时，该配置可以让 TiDB 进程崩溃而不是卡死。</li><li>默认值：0，表示不设置超时</li><li>单位：秒</li><li>在某些用户场景中，TiDB 日志可能是保存在热插拔盘或网络挂载盘上，这些磁盘可能会永久丢失。在这种场景下，TiDB 无法自动恢复，写日志操作会永久阻塞。尽管 TiDB 进程看起来仍在运行，但不会响应任何请求。该配置项用于处理这样的场景。</li></ul><h2 id="logfile" style="position:relative">log.file<a href="#logfile" aria-label="logfile permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h2><p>日志文件相关的配置项。</p><h4 id="filename" style="position:relative"><code>filename</code><a href="#filename" aria-label="filename permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h4><ul><li>一般日志文件名字。</li><li>默认值：""</li><li>如果设置，会输出一般日志到这个文件。</li></ul><h4 id="max-size" style="position:relative"><code>max-size</code><a href="#max-size" aria-label="max size permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h4><ul><li>日志文件的大小限制。</li><li>默认值：300</li><li>单位：MB</li><li>最大设置上限为 4096。</li></ul><h4 id="max-days" style="position:relative"><code>max-days</code><a href="#max-days" aria-label="max days permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h4><ul><li>日志最大保留的天数。</li><li>默认值：0</li><li>默认不清理；如果设置了参数值，在 <code>max-days</code> 之后 TiDB 会清理过期的日志文件。</li></ul><h4 id="max-backups" style="position:relative"><code>max-backups</code><a href="#max-backups" aria-label="max backups permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h4><ul><li>保留的日志的最大数量。</li><li>默认值：0</li><li>默认全部保存；如果设置为 7，会最多保留 7 个老的日志文件。</li></ul><h4 id="compression-span-classversion-mark从-v800-版本开始引入span" style="position:relative"><code>compression</code> <span class="version-mark">从 v8.0.0 版本开始引入</span><a href="#compression-span-classversion-mark%E4%BB%8E-v800-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="compression span classversion mark从 v800 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h4><ul><li>指定日志的压缩方式。</li><li>默认值：""</li><li>可选值：""、"gzip"</li><li>默认值为 "" ，即不压缩。修改为 "gzip" 可以使用 gzip 算法压缩数据。开启压缩后会影响所有的日志文件，包括 <a href="#slow-query-file"><code>slow-query-file</code></a>、<a href="#general-log-file-%E4%BB%8E-v800-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5"><code>general-log-file</code></a> 等。</li></ul><h2 id="security" style="position:relative">security<a href="#security" aria-label="security permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h2><p>安全相关配置。</p><h3 id="enable-sem" style="position:relative"><code>enable-sem</code><a href="#enable-sem" aria-label="enable sem permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>启用安全增强模式 (SEM)。</li><li>默认值：<code>false</code></li><li>可以通过系统变量 <a href="/zh/tidb/stable/system-variables#tidb_enable_enhanced_security"><code>tidb_enable_enhanced_security</code></a> 获取安全增强模式的状态。</li></ul><h3 id="ssl-ca" style="position:relative"><code>ssl-ca</code><a href="#ssl-ca" aria-label="ssl ca permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>PEM 格式的受信任 CA 的证书文件路径。</li><li>默认值：""</li><li>当同时设置了该选项和 <code>--ssl-cert</code>、<code>--ssl-key</code> 选项时，TiDB 将在客户端出示证书的情况下根据该选项指定的受信任的 CA 列表验证客户端证书。若验证失败，则连接会被终止。</li><li>即使设置了该选项，若客户端没有出示证书，则安全连接仍然继续，不会进行客户端证书验证。</li></ul><h3 id="ssl-cert" style="position:relative"><code>ssl-cert</code><a href="#ssl-cert" aria-label="ssl cert permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>PEM 格式的 SSL 证书文件路径。</li><li>默认值：""</li><li>当同时设置了该选项和 <code>--ssl-key</code> 选项时，TiDB 将接受（但不强制）客户端使用 TLS 安全地连接到 TiDB。</li><li>若指定的证书或私钥无效，则 TiDB 会照常启动，但无法接受安全连接。</li></ul><h3 id="ssl-key" style="position:relative"><code>ssl-key</code><a href="#ssl-key" aria-label="ssl key permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>PEM 格式的 SSL 证书密钥文件路径，即 <code>--ssl-cert</code> 所指定的证书的私钥。</li><li>默认值：""</li><li>目前 TiDB 不支持加载由密码保护的私钥。</li></ul><h3 id="cluster-ssl-ca" style="position:relative"><code>cluster-ssl-ca</code><a href="#cluster-ssl-ca" aria-label="cluster ssl ca permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>CA 根证书，用于用 tls 连接 TiKV/PD</li><li>默认值：""</li></ul><h3 id="cluster-ssl-cert" style="position:relative"><code>cluster-ssl-cert</code><a href="#cluster-ssl-cert" aria-label="cluster ssl cert permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>ssl 证书文件路径，用于用 tls 连接 TiKV/PD</li><li>默认值：""</li></ul><h3 id="cluster-ssl-key" style="position:relative"><code>cluster-ssl-key</code><a href="#cluster-ssl-key" aria-label="cluster ssl key permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>ssl 私钥文件路径，用于用 tls 连接 TiKV/PD</li><li>默认值：""</li></ul><h3 id="spilled-file-encryption-method" style="position:relative"><code>spilled-file-encryption-method</code><a href="#spilled-file-encryption-method" aria-label="spilled file encryption method permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>内存落盘文件的加密方式。</li><li>默认值：<code>"plaintext"</code>，表示不进行加密。</li><li>可选值：<code>"plaintext"</code>、<code>"aes128-ctr"</code>。</li></ul><h3 id="auto-tls" style="position:relative"><code>auto-tls</code><a href="#auto-tls" aria-label="auto tls permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>控制 TiDB 启动时是否自动生成 TLS 证书。</li><li>默认值：<code>false</code></li></ul><h3 id="tls-version" style="position:relative"><code>tls-version</code><a href="#tls-version" aria-label="tls version permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><div class="MuiBox-root css-1weqspv"><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardError MuiAlert-standard css-kdwypz" role="alert"><div class="MuiAlert-icon css-1l54tgj"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ErrorOutlineIcon"><path d="M11 15h2v2h-2zm0-8h2v6h-2zm.99-5C6.47 2 2 6.48 2 12s4.47 10 9.99 10C17.52 22 22 17.52 22 12S17.52 2 11.99 2zM12 20c-4.42 0-8-3.58-8-8s3.58-8 8-8 8 3.58 8 8-3.58 8-8 8z"/></svg></div><div class="MuiAlert-message css-1xsto0d"><div class="MuiTypography-root MuiTypography-body1 MuiTypography-gutterBottom MuiAlertTitle-root css-m00e13">警告</div><p>TiDB v7.6.0 废弃了对 <code>"TLSv1.0"</code> 和 <code>"TLSv1.1"</code> 协议对支持，并从 v8.0.0 开始移除对这两个协议的支持。</p></div></div></div><ul><li>设置用于连接 MySQL 协议的最低 TLS 版本。</li><li>默认值：""，支持 TLSv1.2 及以上版本。在 v7.6.0 之前，TiDB 默认支持 TLSv1.1 及以上版本。</li><li>可选值：<code>"TLSv1.2"</code> 和 <code>"TLSv1.3"</code>。在 v8.0.0 之前，TiDB 也支持 <code>"TLSv1.0"</code> 和 <code>"TLSv1.1"</code>。</li></ul><h3 id="auth-token-jwks-span-classversion-mark从-v640-版本开始引入span" style="position:relative"><code>auth-token-jwks</code> <span class="version-mark">从 v6.4.0 版本开始引入</span><a href="#auth-token-jwks-span-classversion-mark%E4%BB%8E-v640-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="auth token jwks span classversion mark从 v640 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>设置 <a href="/zh/tidb/stable/security-compatibility-with-mysql#tidb_auth_token"><code>tidb_auth_token</code></a> 认证方式的 JSON Web Key Sets (JWKS) 的本地文件路径。</li><li>默认值：""</li></ul><h3 id="auth-token-refresh-interval-span-classversion-mark从-v640-版本开始引入span" style="position:relative"><code>auth-token-refresh-interval</code> <span class="version-mark">从 v6.4.0 版本开始引入</span><a href="#auth-token-refresh-interval-span-classversion-mark%E4%BB%8E-v640-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="auth token refresh interval span classversion mark从 v640 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>设置 <a href="/zh/tidb/stable/security-compatibility-with-mysql#tidb_auth_token"><code>tidb_auth_token</code></a> 认证方式的 JWKS 刷新时间间隔。</li><li>默认值：1h</li></ul><h3 id="disconnect-on-expired-password-span-classversion-mark从-v650-版本开始引入span" style="position:relative"><code>disconnect-on-expired-password</code> <span class="version-mark">从 v6.5.0 版本开始引入</span><a href="#disconnect-on-expired-password-span-classversion-mark%E4%BB%8E-v650-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="disconnect on expired password span classversion mark从 v650 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>对于密码已过期的用户，通过 <code>disconnect-on-expired-password</code> 控制 TiDB 服务端是否直接断开该用户的连接。</li><li>默认值：<code>true</code></li><li>默认值为 "true" 表示 TiDB 服务端将直接断开密码已过期用户的连接。设置为 "false" 时，TiDB 服务端将密码已过期用户的连接置于“沙盒模式”，允许该用户建立连接并执行密码重置操作。</li></ul><h3 id="session-token-signing-cert-span-classversion-mark从-v640-版本开始引入span" style="position:relative"><code>session-token-signing-cert</code> <span class="version-mark">从 v6.4.0 版本开始引入</span><a href="#session-token-signing-cert-span-classversion-mark%E4%BB%8E-v640-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="session token signing cert span classversion mark从 v640 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>证书文件路径，用于 <a href="/zh/tidb/stable/tiproxy-overview">TiProxy</a> 的会话迁移。</li><li>默认值：""</li><li>空值将导致 TiProxy 会话迁移失败。要启用会话迁移，所有的 TiDB 节点必须设置相同的证书和密钥。因此你应该在每个 TiDB 节点上存储相同的证书和密钥。</li></ul><h3 id="session-token-signing-key-span-classversion-mark从-v640-版本开始引入span" style="position:relative"><code>session-token-signing-key</code> <span class="version-mark">从 v6.4.0 版本开始引入</span><a href="#session-token-signing-key-span-classversion-mark%E4%BB%8E-v640-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="session token signing key span classversion mark从 v640 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>密钥文件路径，用于 <a href="/zh/tidb/stable/tiproxy-overview">TiProxy</a> 的会话迁移。</li><li>默认值：""</li><li>参阅 <a href="#session-token-signing-cert-%E4%BB%8E-v640-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5"><code>session-token-signing-cert</code></a> 的描述。</li></ul><h2 id="performance" style="position:relative">performance<a href="#performance" aria-label="performance permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h2><p>性能相关配置。</p><h3 id="max-procs" style="position:relative"><code>max-procs</code><a href="#max-procs" aria-label="max procs permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>TiDB 的 CPU 使用数量。</li><li>默认值：0</li><li>默认值为 0 表示使用机器上所有的 CPU；如果设置成 n，那么 TiDB 会使用 n 个 CPU 数量。</li></ul><h3 id="server-memory-quota-span-classversion-mark从-v409-版本开始引入span" style="position:relative"><code>server-memory-quota</code> <span class="version-mark">从 v4.0.9 版本开始引入</span><a href="#server-memory-quota-span-classversion-mark%E4%BB%8E-v409-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="server memory quota span classversion mark从 v409 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><div class="MuiBox-root css-1weqspv"><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardError MuiAlert-standard css-kdwypz" role="alert"><div class="MuiAlert-icon css-1l54tgj"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ErrorOutlineIcon"><path d="M11 15h2v2h-2zm0-8h2v6h-2zm.99-5C6.47 2 2 6.48 2 12s4.47 10 9.99 10C17.52 22 22 17.52 22 12S17.52 2 11.99 2zM12 20c-4.42 0-8-3.58-8-8s3.58-8 8-8 8 3.58 8 8-3.58 8-8 8z"/></svg></div><div class="MuiAlert-message css-1xsto0d"><div class="MuiTypography-root MuiTypography-body1 MuiTypography-gutterBottom MuiAlertTitle-root css-m00e13">警告</div><p>自 v6.5.0 起，该配置项被废弃。请使用 <a href="/zh/tidb/stable/system-variables#tidb_server_memory_limit-从-v640-版本开始引入"><code>tidb_server_memory_limit</code></a> 系统变量进行设置。</p></div></div></div><ul><li>设置 tidb-server 实例的最大内存用量，单位为字节。</li><li>默认值：0</li><li>默认值为 0 表示无内存限制。</li></ul><h3 id="txn-entry-size-limit-span-classversion-mark从-v4010-和-v500-版本开始引入span" style="position:relative"><code>txn-entry-size-limit</code> <span class="version-mark">从 v4.0.10 和 v5.0.0 版本开始引入</span><a href="#txn-entry-size-limit-span-classversion-mark%E4%BB%8E-v4010-%E5%92%8C-v500-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="txn entry size limit span classversion mark从 v4010 和 v500 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>TiDB 单行数据的大小限制</li><li>默认值：6291456</li><li>单位：Byte</li><li>事务中单个 key-value 记录的大小限制。若超出该限制，TiDB 将会返回 <code>entry too large</code> 错误。该配置项的最大值不超过 <code>125829120</code>（表示 120MB）。</li><li>从 v7.6.0 开始，你可以使用 <a href="/zh/tidb/stable/system-variables#tidb_txn_entry_size_limit-从-v760-版本开始引入"><code>tidb_txn_entry_size_limit</code></a> 系统变量动态修改该配置项的值。</li><li>注意，TiKV 有类似的限制。若单个写入请求的数据量大小超出 <a href="/zh/tidb/stable/tikv-configuration-file#raft-entry-max-size"><code>raft-entry-max-size</code></a>，默认为 8MB，TiKV 会拒绝处理该请求。当表的一行记录较大时，需要同时修改这两个配置。</li><li><a href="/zh/tidb/stable/system-variables#max_allowed_packet-从-v610-版本开始引入"><code>max_allowed_packet</code></a> (MySQL 协议的最大数据包大小) 的默认值为 <code>67108864</code>（64 MiB）。如果一行记录的大小超过 <code>max_allowed_packet</code>，该行记录会被截断。</li><li><a href="#txn-total-size-limit"><code>txn-total-size-limit</code></a>（TiDB 单个事务大小限制）的默认值为 100 MiB。如果将 <code>txn-entry-size-limit</code> 的值设置为 100 MiB 以上，需要相应地调大 <code>txn-total-size-limit</code> 的值。</li></ul><h3 id="txn-total-size-limit" style="position:relative"><code>txn-total-size-limit</code><a href="#txn-total-size-limit" aria-label="txn total size limit permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>TiDB 单个事务大小限制</li><li>默认值：104857600</li><li>单位：Byte</li><li>单个事务中，所有 key-value 记录的总大小不能超过该限制。该配置项的最大值不超过 <code>1099511627776</code>（表示 1TB）。注意，如果使用了以 <code>Kafka</code> 为下游消费者的 <code>binlog</code>，该配置项的值不能超过 <code>1073741824</code>（表示 1GB），因为这是 <code>Kafka</code> 的处理单条消息的最大限制，超过该限制 <code>Kafka</code> 将会报错。</li><li>在 v6.5.0 及之后的版本中，不再推荐使用该配置项，事务的内存大小会被累计计入所在会话的内存使用量中，并由 <a href="/zh/tidb/stable/system-variables#tidb_mem_quota_query"><code>tidb_mem_quota_query</code></a> 变量在单个会话内存超阈值时采取控制行为。为了向前兼容，由低版本升级至 v6.5.0 及更高版本时，该配置项的行为如下所述:<ul><li>若该配置项未设置，或设置为默认值 (<code>104857600</code>)，升级后事务内存大小将会计入所在会话的内存使用中，由 <code>tidb_mem_quota_query</code> 变量控制。</li><li>若该配置项未设为默认值 (<code>104857600</code>)，升级前后该配置项仍生效，对单个事务大小的限制行为不会发生变化，事务内存大小不由 <code>tidb_mem_quota_query</code> 控制。</li></ul></li><li>从 v8.0.0 开始，如果系统变量 <a href="/zh/tidb/stable/system-variables#tidb_dml_type-从-v800-版本开始引入"><code>tidb_dml_type</code></a> 以 <code>"bulk"</code> 方式执行事务时，事务的大小不受 TiDB 配置项 <code>txn-total-size-limit</code> 的限制。</li></ul><h3 id="max-txn-ttl" style="position:relative"><code>max-txn-ttl</code><a href="#max-txn-ttl" aria-label="max txn ttl permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>单个事务持锁的最长时间，超过该时间，该事务的锁可能会被其他事务清除，导致该事务无法成功提交。</li><li>默认值：3600000</li><li>单位：毫秒</li><li>超过此时间的事务只能执行提交或者回滚，提交不一定能够成功。</li><li>对于使用 <a href="/zh/tidb/stable/system-variables#tidb_dml_type-从-v800-版本开始引入"><code>"bulk"</code> DML 方式</a>执行的事务，其最大 TTL 可以超过该配置项的限制，最大不超过 24 小时或该配置项值中的较大者。</li></ul><h3 id="stmt-count-limit" style="position:relative"><code>stmt-count-limit</code><a href="#stmt-count-limit" aria-label="stmt count limit permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>TiDB 单个事务允许的最大语句条数限制。</li><li>默认值：5000</li><li>在一个事务中，超过 <code>stmt-count-limit</code> 条语句后还没有 rollback 或者 commit，TiDB 将会返回 <code>statement count 5001 exceeds the transaction limitation, autocommit = false</code> 错误。该限制只在可重试的乐观事务中生效，如果使用悲观事务或者关闭了<a href="/zh/tidb/stable/optimistic-transaction#事务的重试">事务重试</a>，事务中的语句数将不受此限制。</li></ul><h3 id="tcp-keep-alive" style="position:relative"><code>tcp-keep-alive</code><a href="#tcp-keep-alive" aria-label="tcp keep alive permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>TiDB 在 TCP 层开启 keepalive。</li><li>默认值：true</li></ul><h3 id="tcp-no-delay" style="position:relative"><code>tcp-no-delay</code><a href="#tcp-no-delay" aria-label="tcp no delay permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>控制 TiDB 是否在 TCP 层开启 TCP_NODELAY。开启后，TiDB 将禁用 TCP/IP 协议中的 Nagle 算法，允许小数据包的发送，可以降低网络延时，适用于延时敏感型且数据传输量比较小的应用。</li><li>默认值：true</li></ul><h3 id="cross-join" style="position:relative"><code>cross-join</code><a href="#cross-join" aria-label="cross join permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>默认值：true</li><li>默认可以执行在做 join 时两边表没有任何条件（where 字段）的语句；如果设置为 false，则有这样的 join 语句出现时，server 会拒绝执行</li></ul><div class="MuiBox-root css-1weqspv"><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardInfo MuiAlert-standard css-1bzshic" role="alert"><div class="MuiAlert-icon css-1l54tgj"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="InfoOutlinedIcon"><path d="M11,9H13V7H11M12,20C7.59,20 4,16.41 4,12C4,7.59 7.59,4 12,4C16.41,4 20,7.59 20, 12C20,16.41 16.41,20 12,20M12,2A10,10 0 0,0 2,12A10,10 0 0,0 12,22A10,10 0 0,0 22,12A10, 10 0 0,0 12,2M11,17H13V11H11V17Z"/></svg></div><div class="MuiAlert-message css-1xsto0d"><div class="MuiTypography-root MuiTypography-body1 MuiTypography-gutterBottom MuiAlertTitle-root css-m00e13">注意</div><p>在创建集群时，不要将 <code>cross-join</code> 设置为 false，否则会导致集群启动失败。</p></div></div></div><h3 id="stats-lease" style="position:relative"><code>stats-lease</code><a href="#stats-lease" aria-label="stats lease permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>TiDB 重载统计信息，更新表行数，检查是否需要自动 analyze，利用 feedback 更新统计信息以及加载列的统计信息的时间间隔。</li><li>默认值：3s<ul><li>每隔 <code>stats-lease</code> 时间，TiDB 会检查统计信息是否有更新，如果有会将其更新到内存中</li><li>每隔 <code>20 * stats-lease</code> 时间，TiDB 会将 DML 产生的总行数以及修改的行数变化更新到系统表中</li><li>每隔 <code>stats-lease</code> 时间，TiDB 会检查是否有表或者索引需要自动 analyze</li><li>每隔 <code>stats-lease</code> 时间，TiDB 会检查是否有列的统计信息需要被加载到内存中</li><li>每隔 <code>200 * stats-lease</code> 时间，TiDB 会将内存中缓存的 feedback 写入系统表中</li><li>每隔 <code>5 * stats-lease</code> 时间，TiDB 会读取系统表中的 feedback，更新内存中缓存的统计信息</li></ul></li><li>当 <code>stats-lease</code> 为 0s 时，TiDB 会以 3s 的时间间隔周期性的读取系统表中的统计信息并更新内存中缓存的统计信息。但不会自动修改统计信息相关系统表，具体来说，TiDB 不再自动修改这些表：<ul><li><code>mysql.stats_meta</code>：TiDB 不再自动记录事务中对某张表的修改行数，也不会更新到这个系统表中</li><li><code>mysql.stats_histograms</code>/<code>mysql.stats_buckets</code> 和 <code>mysql.stats_top_n</code>：TiDB 不再自动 analyze 和主动更新统计信息</li><li><code>mysql.stats_feedback</code>：TiDB 不再根据被查询的数据反馈的部分统计信息更新表和索引的统计信息</li></ul></li></ul><h3 id="pseudo-estimate-ratio" style="position:relative"><code>pseudo-estimate-ratio</code><a href="#pseudo-estimate-ratio" aria-label="pseudo estimate ratio permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>修改过的行数/表的总行数的比值，超过该值时系统会认为统计信息已经过期，会采用 pseudo 的统计信息。</li><li>默认值：0.8</li><li>最小值：0</li><li>最大值：1</li></ul><h3 id="force-priority" style="position:relative"><code>force-priority</code><a href="#force-priority" aria-label="force priority permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>把所有的语句优先级设置为 force-priority 的值。</li><li>默认值：NO_PRIORITY</li><li>可选值：默认值 NO_PRIORITY 表示不强制改变执行语句的优先级，其它优先级从低到高可设置为 LOW_PRIORITY、DELAYED 或 HIGH_PRIORITY。</li><li>自 v6.1.0 起，已改用配置项 <a href="/zh/tidb/stable/tidb-configuration-file#tidb_force_priority"><code>instance.tidb_force_priority</code></a> 或系统变量 <a href="/zh/tidb/stable/system-variables#tidb_force_priority"><code>tidb_force_priority</code></a> 来将所有语句优先级设为 force-priority 的值。<code>force-priority</code> 仍可使用，但如果同时设置了 <code>force-priority</code> 与 <code>instance.tidb_force_priority</code>，TiDB 将采用 <code>instance.tidb_force_priority</code> 的值。</li></ul><div class="MuiBox-root css-1weqspv"><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardInfo MuiAlert-standard css-1bzshic" role="alert"><div class="MuiAlert-icon css-1l54tgj"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="InfoOutlinedIcon"><path d="M11,9H13V7H11M12,20C7.59,20 4,16.41 4,12C4,7.59 7.59,4 12,4C16.41,4 20,7.59 20, 12C20,16.41 16.41,20 12,20M12,2A10,10 0 0,0 2,12A10,10 0 0,0 12,22A10,10 0 0,0 22,12A10, 10 0 0,0 12,2M11,17H13V11H11V17Z"/></svg></div><div class="MuiAlert-message css-1xsto0d"><div class="MuiTypography-root MuiTypography-body1 MuiTypography-gutterBottom MuiAlertTitle-root css-m00e13">注意</div><p>TiDB 从 v6.6.0 版本开始支持<a href="/zh/tidb/stable/tidb-resource-control">使用资源管控 (Resource Control) 实现资源隔离</a>功能。该功能可以将不同优先级的语句放在不同的资源组中执行，并为这些资源组分配不同的配额和优先级，可以达到更好的资源管控效果。在开启资源管控功能后，语句的调度主要受资源组的控制，<code>PRIORITY</code> 将不再生效。建议在支持资源管控的版本优先使用资源管控功能。</p></div></div></div><h3 id="distinct-agg-push-down" style="position:relative"><code>distinct-agg-push-down</code><a href="#distinct-agg-push-down" aria-label="distinct agg push down permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>设置优化器是否执行将带有 <code>Distinct</code> 的聚合函数（比如 <code>select count(distinct a) from t</code>）下推到 Coprocessor 的优化操作。</li><li>默认值：false</li><li>该变量作为系统变量 <a href="/zh/tidb/stable/system-variables#tidb_opt_distinct_agg_push_down"><code>tidb_opt_distinct_agg_push_down</code></a> 的初始值。</li></ul><h3 id="enforce-mpp" style="position:relative"><code>enforce-mpp</code><a href="#enforce-mpp" aria-label="enforce mpp permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>用于控制是否忽略优化器代价估算，强制使用 TiFlash 的 MPP 模式执行查询。</li><li>默认值：false</li><li>该配置项可以控制系统变量 <a href="/zh/tidb/stable/system-variables#tidb_enforce_mpp-从-v51-版本开始引入"><code>tidb_enforce_mpp</code></a> 的初始值。例如，当设置该配置项为 true 时，<code>tidb_enforce_mpp</code> 的默认值为 ON。</li></ul><h3 id="stats-load-concurrency-span-classversion-mark从-v540-版本开始引入span" style="position:relative"><code>stats-load-concurrency</code> <span class="version-mark">从 v5.4.0 版本开始引入</span><a href="#stats-load-concurrency-span-classversion-mark%E4%BB%8E-v540-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="stats load concurrency span classversion mark从 v540 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>TiDB 统计信息同步加载功能可以并发处理的最大列数</li><li>默认值：5</li><li>目前的合法值范围：<code>[1, 128]</code></li></ul><h3 id="stats-load-queue-size-span-classversion-mark从-v540-版本开始引入span" style="position:relative"><code>stats-load-queue-size</code> <span class="version-mark">从 v5.4.0 版本开始引入</span><a href="#stats-load-queue-size-span-classversion-mark%E4%BB%8E-v540-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="stats load queue size span classversion mark从 v540 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>用于设置 TiDB 统计信息同步加载功能最多可以缓存多少列的请求</li><li>默认值：1000</li><li>目前的合法值范围：<code>[1, 100000]</code></li></ul><h3 id="enable-stats-cache-mem-quota-span-classversion-mark从-v610-版本开始引入span" style="position:relative"><code>enable-stats-cache-mem-quota</code> <span class="version-mark">从 v6.1.0 版本开始引入</span><a href="#enable-stats-cache-mem-quota-span-classversion-mark%E4%BB%8E-v610-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="enable stats cache mem quota span classversion mark从 v610 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>用于控制 TiDB 是否开启统计信息缓存的内存上限。</li><li>默认值：true</li></ul><h3 id="concurrently-init-stats-span-classversion-mark从-v810-和-v752-版本开始引入span" style="position:relative"><code>concurrently-init-stats</code> <span class="version-mark">从 v8.1.0 和 v7.5.2 版本开始引入</span><a href="#concurrently-init-stats-span-classversion-mark%E4%BB%8E-v810-%E5%92%8C-v752-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="concurrently init stats span classversion mark从 v810 和 v752 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>用于控制 TiDB 启动时是否并发初始化统计信息。</li><li>默认值：<code>false</code></li></ul><h3 id="lite-init-stats-span-classversion-mark从-v710-版本开始引入span" style="position:relative"><code>lite-init-stats</code> <span class="version-mark">从 v7.1.0 版本开始引入</span><a href="#lite-init-stats-span-classversion-mark%E4%BB%8E-v710-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="lite init stats span classversion mark从 v710 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>用于控制 TiDB 启动时是否采用轻量级的统计信息初始化。</li><li>默认值：在 v7.2.0 之前版本中为 <code>false</code>，在 v7.2.0 及之后的版本中为 <code>true</code>。</li><li>当 <code>lite-init-stats</code> 为 <code>true</code> 时，统计信息初始化时列和索引的直方图、TopN、Count-Min Sketch 均不会加载到内存中。当 <code>lite-init-stats</code> 为 <code>false</code> 时，统计信息初始化时索引和主键的直方图、TopN、Count-Min Sketch 会被加载到内存中，非主键列的直方图、TopN、Count-Min Sketch 不会加载到内存中。当优化器需要某一索引或者列的直方图、TopN、Count-Min Sketch 时，这些统计信息会被同步或异步加载到内存中（由 <a href="/zh/tidb/stable/system-variables#tidb_stats_load_sync_wait-从-v540-版本开始引入"><code>tidb_stats_load_sync_wait</code></a> 控制）。</li><li>将 <code>lite-init-stats</code> 设置为 true，可以加速统计信息初始化，避免加载不必要的统计信息，从而降低 TiDB 的内存使用。详情请参考<a href="/zh/tidb/stable/statistics#加载统计信息">统计信息的加载</a>。</li></ul><h3 id="force-init-stats-span-classversion-mark从-v657-和-v710-版本开始引入span" style="position:relative"><code>force-init-stats</code> <span class="version-mark">从 v6.5.7 和 v7.1.0 版本开始引入</span><a href="#force-init-stats-span-classversion-mark%E4%BB%8E-v657-%E5%92%8C-v710-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="force init stats span classversion mark从 v657 和 v710 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>用于控制 TiDB 启动时是否在统计信息初始化完成后再对外提供服务。</li><li>默认值：在 v7.2.0 之前版本中为 <code>false</code>，在 v7.2.0 及之后的版本中为 <code>true</code>。</li><li>当 <code>force-init-stats</code> 为 <code>true</code> 时，TiDB 启动时会等到统计信息初始化完成后再对外提供服务。需要注意的是，在表和分区数量较多且 <a href="/zh/tidb/stable/tidb-configuration-file#lite-init-stats-从-v710-版本开始引入"><code>lite-init-stats</code></a> 为 <code>false</code> 的情况下，<code>force-init-stats</code> 为 <code>true</code> 可能会导致 TiDB 从启动到开始对外提供服务的时间变长。</li><li>当 <code>force-init-stats</code> 为 <code>false</code> 时，TiDB 在统计信息初始化未完成时即可对外提供服务，但由于统计信息初始化未完成，优化器会用 pseudo 统计信息进行决策，可能会产生不合理的执行计划。</li></ul><h2 id="opentracing" style="position:relative">opentracing<a href="#opentracing" aria-label="opentracing permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h2><p>opentracing 的相关的设置。</p><h3 id="enable" style="position:relative"><code>enable</code><a href="#enable" aria-label="enable permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>开启 opentracing 跟踪 TiDB 部分组件的调用开销。注意开启后会有一定的性能损失。</li><li>默认值：false</li></ul><h3 id="rpc-metrics" style="position:relative"><code>rpc-metrics</code><a href="#rpc-metrics" aria-label="rpc metrics permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>开启 rpc metrics。</li><li>默认值：false</li></ul><h2 id="opentracingsampler" style="position:relative">opentracing.sampler<a href="#opentracingsampler" aria-label="opentracingsampler permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h2><p>opentracing.sampler 相关的设置。</p><h3 id="type" style="position:relative"><code>type</code><a href="#type" aria-label="type permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>opentracing 采样器的类型。字符串取值大小写不敏感。</li><li>默认值："const"</li><li>可选值："const"，"probabilistic"，"ratelimiting"，remote"</li></ul><h3 id="param" style="position:relative"><code>param</code><a href="#param" aria-label="param permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>采样器参数。<ul><li>对于 const 类型，可选值为 0 或 1，表示是否开启。</li><li>对于 probabilistic 类型，参数为采样概率，可选值为 0 到 1 之间的浮点数。</li><li>对于 ratelimiting 类型，参数为每秒采样 span 的个数。</li><li>对于 remote 类型，参数为采样概率，可选值为 0 到 1 之间的浮点数。</li></ul></li><li>默认值：1.0</li></ul><h3 id="sampling-server-url" style="position:relative"><code>sampling-server-url</code><a href="#sampling-server-url" aria-label="sampling server url permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>jaeger-agent 采样服务器的 HTTP URL 地址。</li><li>默认值：""</li></ul><h3 id="max-operations" style="position:relative"><code>max-operations</code><a href="#max-operations" aria-label="max operations permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>采样器可追踪的最大操作数。如果一个操作没有被追踪，会启用默认的 probabilistic 采样器。</li><li>默认值：0</li></ul><h3 id="sampling-refresh-interval" style="position:relative"><code>sampling-refresh-interval</code><a href="#sampling-refresh-interval" aria-label="sampling refresh interval permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>控制远程轮询 jaeger-agent 采样策略的频率。</li><li>默认值：0</li></ul><h2 id="opentracingreporter" style="position:relative">opentracing.reporter<a href="#opentracingreporter" aria-label="opentracingreporter permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h2><p>opentracing.reporter 相关的设置。</p><h3 id="queue-size" style="position:relative"><code>queue-size</code><a href="#queue-size" aria-label="queue size permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>reporter 在内存中记录 spans 个数的队列容量。</li><li>默认值：0</li></ul><h3 id="buffer-flush-interval" style="position:relative"><code>buffer-flush-interval</code><a href="#buffer-flush-interval" aria-label="buffer flush interval permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>reporter 缓冲区的刷新频率。</li><li>默认值：0</li></ul><h3 id="log-spans" style="position:relative"><code>log-spans</code><a href="#log-spans" aria-label="log spans permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>是否为所有提交的 span 打印日志。</li><li>默认值：false</li></ul><h3 id="local-agent-host-port" style="position:relative"><code>local-agent-host-port</code><a href="#local-agent-host-port" aria-label="local agent host port permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>reporter 向 jaeger-agent 发送 span 的地址。</li><li>默认值：""</li></ul><h2 id="tikv-client" style="position:relative">tikv-client<a href="#tikv-client" aria-label="tikv client permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h2><h3 id="grpc-connection-count" style="position:relative"><code>grpc-connection-count</code><a href="#grpc-connection-count" aria-label="grpc connection count permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>跟每个 TiKV 之间建立的最大连接数。</li><li>默认值：4</li></ul><h3 id="grpc-keepalive-time" style="position:relative"><code>grpc-keepalive-time</code><a href="#grpc-keepalive-time" aria-label="grpc keepalive time permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>TiDB 与 TiKV 节点之间 rpc 连接 keepalive 时间间隔，如果超过该值没有网络包，grpc client 会 ping 一下 TiKV 查看是否存活。</li><li>默认值：10</li><li>单位：秒</li></ul><h3 id="grpc-keepalive-timeout" style="position:relative"><code>grpc-keepalive-timeout</code><a href="#grpc-keepalive-timeout" aria-label="grpc keepalive timeout permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>TiDB 与 TiKV 节点 rpc keepalive 检查的超时时间</li><li>默认值：3</li><li>单位：秒</li></ul><h3 id="grpc-compression-type" style="position:relative"><code>grpc-compression-type</code><a href="#grpc-compression-type" aria-label="grpc compression type permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>控制 TiDB 向 TiKV 节点传输数据使用的压缩算法类型。默认值为 "none" 即不压缩。修改为 "gzip" 可以使用 gzip 算法压缩数据。</li><li>默认值："none"</li><li>可选值："none", "gzip"</li></ul><h3 id="commit-timeout" style="position:relative"><code>commit-timeout</code><a href="#commit-timeout" aria-label="commit timeout permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>执行事务提交时，最大的超时时间。</li><li>默认值：41s</li><li>这个值必须是大于两倍 Raft 选举的超时时间。</li></ul><h3 id="max-batch-size" style="position:relative"><code>max-batch-size</code><a href="#max-batch-size" aria-label="max batch size permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>批量发送 rpc 封包的最大数量，如果不为 0，将使用 BatchCommands api 发送请求到 TiKV，可以在并发度高的情况降低 rpc 的延迟，推荐不修改该值。</li><li>默认值：128</li></ul><h3 id="max-batch-wait-time" style="position:relative"><code>max-batch-wait-time</code><a href="#max-batch-wait-time" aria-label="max batch wait time permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>等待 <code>max-batch-wait-time</code> 纳秒批量将此期间的数据包封装成一个大包发送给 TiKV 节点，仅在 <code>tikv-client.max-batch-size</code> 值大于 0 时有效，不推荐修改该值。</li><li>默认值：0</li><li>单位：纳秒</li></ul><h3 id="batch-wait-size" style="position:relative"><code>batch-wait-size</code><a href="#batch-wait-size" aria-label="batch wait size permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>批量向 TiKV 发送的封包最大数量，不推荐修改该值。</li><li>默认值：8</li><li>若此值为 0 表示关闭此功能。</li></ul><h3 id="overload-threshold" style="position:relative"><code>overload-threshold</code><a href="#overload-threshold" aria-label="overload threshold permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>TiKV 的负载阈值，如果超过此阈值，会收集更多的 batch 封包，来减轻 TiKV 的压力。仅在 <code>tikv-client.max-batch-size</code> 值大于 0 时有效，不推荐修改该值。</li><li>默认值：200</li></ul><h3 id="copr-req-timeout-span-classversion-mark从-v750-版本开始引入span" style="position:relative"><code>copr-req-timeout</code> <span class="version-mark">从 v7.5.0 版本开始引入</span><a href="#copr-req-timeout-span-classversion-mark%E4%BB%8E-v750-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="copr req timeout span classversion mark从 v750 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><div class="MuiBox-root css-1weqspv"><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardError MuiAlert-standard css-kdwypz" role="alert"><div class="MuiAlert-icon css-1l54tgj"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ErrorOutlineIcon"><path d="M11 15h2v2h-2zm0-8h2v6h-2zm.99-5C6.47 2 2 6.48 2 12s4.47 10 9.99 10C17.52 22 22 17.52 22 12S17.52 2 11.99 2zM12 20c-4.42 0-8-3.58-8-8s3.58-8 8-8 8 3.58 8 8-3.58 8-8 8z"/></svg></div><div class="MuiAlert-message css-1xsto0d"><div class="MuiTypography-root MuiTypography-body1 MuiTypography-gutterBottom MuiAlertTitle-root css-m00e13">警告</div><p>该配置项可能会在未来版本中废弃，<strong>不要修改该配置</strong>。</p></div></div></div><ul><li>单个 Coprocessor Request 的超时时间</li><li>默认值：60</li><li>单位：秒</li></ul><h3 id="enable-replica-selector-v2-span-classversion-mark从-v800-版本开始引入span" style="position:relative"><code>enable-replica-selector-v2</code> <span class="version-mark">从 v8.0.0 版本开始引入</span><a href="#enable-replica-selector-v2-span-classversion-mark%E4%BB%8E-v800-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="enable replica selector v2 span classversion mark从 v800 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><div class="MuiBox-root css-1weqspv"><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardError MuiAlert-standard css-kdwypz" role="alert"><div class="MuiAlert-icon css-1l54tgj"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ErrorOutlineIcon"><path d="M11 15h2v2h-2zm0-8h2v6h-2zm.99-5C6.47 2 2 6.48 2 12s4.47 10 9.99 10C17.52 22 22 17.52 22 12S17.52 2 11.99 2zM12 20c-4.42 0-8-3.58-8-8s3.58-8 8-8 8 3.58 8 8-3.58 8-8 8z"/></svg></div><div class="MuiAlert-message css-1xsto0d"><div class="MuiTypography-root MuiTypography-body1 MuiTypography-gutterBottom MuiAlertTitle-root css-m00e13">警告</div><p>该配置项可能会在未来版本中废弃，<strong>不要修改该配置</strong>。</p></div></div></div><ul><li>用于控制给 TiKV 发送 RPC 请求时，是否使用新版本的 Region 副本选择器。</li><li>默认值：true</li></ul><h2 id="tikv-clientcopr-cache-span-classversion-mark从-v400-版本开始引入span" style="position:relative">tikv-client.copr-cache <span class="version-mark">从 v4.0.0 版本开始引入</span><a href="#tikv-clientcopr-cache-span-classversion-mark%E4%BB%8E-v400-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="tikv clientcopr cache span classversion mark从 v400 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h2><p>本部分介绍 Coprocessor Cache 相关的配置项。</p><h3 id="capacity-mb" style="position:relative"><code>capacity-mb</code><a href="#capacity-mb" aria-label="capacity mb permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>缓存的总数据量大小。当缓存空间满时，旧缓存条目将被逐出。值为 0.0 时表示关闭 Coprocessor Cache。</li><li>默认值：1000.0</li><li>单位：MB</li><li>类型：Float</li></ul><h2 id="txn-local-latches" style="position:relative">txn-local-latches<a href="#txn-local-latches" aria-label="txn local latches permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h2><p>与事务锁存相关的配置项。这些配置项今后可能会废弃，不建议启用。</p><h3 id="enabled" style="position:relative"><code>enabled</code><a href="#enabled" aria-label="enabled permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>控制是否开启事务的内存锁。</li><li>默认值：<code>false</code></li></ul><h3 id="capacity" style="position:relative"><code>capacity</code><a href="#capacity" aria-label="capacity permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>Hash 对应的 slot 数量，自动向上调整为 2 的指数倍。每个 slot 占用 32 字节内存。如果设置过小，在数据写入范围较大的场景（如导入数据），可能会导致运行速度变慢，性能变差。</li><li>默认值：<code>2048000</code></li></ul><h2 id="binlog" style="position:relative">binlog<a href="#binlog" aria-label="binlog permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h2><p>TiDB Binlog 相关配置。</p><h3 id="enable-1" style="position:relative"><code>enable</code><a href="#enable-1" aria-label="enable 1 permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>binlog 开关。</li><li>默认值：false</li></ul><h3 id="write-timeout" style="position:relative"><code>write-timeout</code><a href="#write-timeout" aria-label="write timeout permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>写 binlog 的超时时间，推荐不修改该值。</li><li>默认值：15s</li><li>单位：秒</li></ul><h3 id="ignore-error" style="position:relative"><code>ignore-error</code><a href="#ignore-error" aria-label="ignore error permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>忽略写 binlog 发生的错误时处理开关，推荐不修改该值。</li><li>默认值：false</li><li>如果设置为 <code>true</code>，发生错误时，TiDB 会停止写入 binlog，并且在监控项 <code>tidb_server_critical_error_total</code> 上计数加 1；如果设置为 <code>false</code>，写入 binlog 失败，会停止整个 TiDB 的服务。</li></ul><h3 id="binlog-socket" style="position:relative"><code>binlog-socket</code><a href="#binlog-socket" aria-label="binlog socket permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>binlog 输出网络地址。</li><li>默认值：""</li></ul><h3 id="strategy" style="position:relative"><code>strategy</code><a href="#strategy" aria-label="strategy permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>binlog 输出时选择 pump 的策略，仅支持 hash，range 方法。</li><li>默认值："range"</li></ul><h2 id="status" style="position:relative">status<a href="#status" aria-label="status permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h2><p>TiDB 服务状态相关配置。</p><h3 id="report-status" style="position:relative"><code>report-status</code><a href="#report-status" aria-label="report status permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>开启 HTTP API 服务的开关。</li><li>默认值：true</li></ul><h3 id="record-db-qps" style="position:relative"><code>record-db-qps</code><a href="#record-db-qps" aria-label="record db qps permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>输出与 database 相关的 QPS metrics 到 Prometheus 的开关。</li><li>默认值：false</li></ul><h3 id="record-db-label" style="position:relative"><code>record-db-label</code><a href="#record-db-label" aria-label="record db label permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>控制是否向 Prometheus 传输与数据库相关的 QPS 指标。</li><li>支持的指标类型比 <code>record-db-qps</code> 更多，比如 duration 和 statements。</li><li>默认值：<code>false</code></li></ul><h2 id="pessimistic-txn" style="position:relative">pessimistic-txn<a href="#pessimistic-txn" aria-label="pessimistic txn permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h2><p>悲观事务使用方法请参考 <a href="/zh/tidb/stable/pessimistic-transaction">TiDB 悲观事务模式</a>。</p><h3 id="max-retry-count" style="position:relative">max-retry-count<a href="#max-retry-count" aria-label="max retry count permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>悲观事务中单个语句最大重试次数，重试次数超过该限制，语句执行将会报错。</li><li>默认值：256</li></ul><h3 id="deadlock-history-capacity" style="position:relative">deadlock-history-capacity<a href="#deadlock-history-capacity" aria-label="deadlock history capacity permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>单个 TiDB 节点的 <a href="/zh/tidb/stable/information-schema-deadlocks"><code>INFORMATION_SCHEMA.DEADLOCKS</code></a> 表最多可记录的死锁事件个数。当表的容量已满时，如果再次发生死锁错误，最早的一次死锁错误的信息将从表中移除。</li><li>默认值：10</li><li>最小值：0</li><li>最大值：10000</li></ul><h3 id="deadlock-history-collect-retryable" style="position:relative">deadlock-history-collect-retryable<a href="#deadlock-history-collect-retryable" aria-label="deadlock history collect retryable permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>控制 <a href="/zh/tidb/stable/information-schema-deadlocks"><code>INFORMATION_SCHEMA.DEADLOCKS</code></a> 表中是否收集可重试的死锁错误信息。详见 <code>DEADLOCKS</code> 表文档的<a href="/zh/tidb/stable/information-schema-deadlocks#可重试的死锁错误">可重试的死锁错误</a>小节。</li><li>默认值：false</li></ul><h3 id="pessimistic-auto-commit" style="position:relative">pessimistic-auto-commit<a href="#pessimistic-auto-commit" aria-label="pessimistic auto commit permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>用来控制开启全局悲观事务模式下 (<code>tidb_txn_mode='pessimistic'</code>) 时，自动提交的事务使用的事务模式。默认情况下，即使开启全局悲观事务模式，自动提交事务依然使用乐观事务模式来执行。当开启该配置项后（设置为 <code>true</code>），在全局悲观事务模式下，自动提交事务将也使用悲观事务模式执行。行为与其他显式提交的悲观事务相同。</li><li>对于存在冲突的场景，开启本开关可以将自动提交事务纳入全局等锁管理中，从而避免死锁，改善冲突造成死锁带来的时延尖刺。</li><li>对于不存在冲突的场景，如果有大量自动提交事务（例如自动提交事务数量占业务数量的比例超过一半甚至更多，需要根据实际情况分析）且单个事务操作数据量较大的情况下，开启该配置项会造成性能回退。例如，自动提交的 <code>INSERT INTO SELECT</code> 语句。</li><li>当 SESSION 级系统变量 <a href="/zh/tidb/stable/system-variables#tidb_dml_type-从-v800-版本开始引入"><code>tidb_dml_type</code></a> 设置为 <code>"bulk"</code> 时，在该 SESSION 中，该配置项的效果等同于设置为 <code>false</code>。</li><li>默认值：false</li></ul><h3 id="constraint-check-in-place-pessimistic-span-classversion-mark从-v640-版本开始引入span" style="position:relative">constraint-check-in-place-pessimistic <span class="version-mark">从 v6.4.0 版本开始引入</span><a href="#constraint-check-in-place-pessimistic-span-classversion-mark%E4%BB%8E-v640-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="constraint check in place pessimistic span classversion mark从 v640 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>用来控制系统变量 <a href="/zh/tidb/stable/system-variables#tidb_constraint_check_in_place_pessimistic-从-v630-版本开始引入"><code>tidb_constraint_check_in_place_pessimistic</code></a> 的默认值。</li><li>默认值：true</li></ul><h2 id="isolation-read" style="position:relative">isolation-read<a href="#isolation-read" aria-label="isolation read permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h2><p>读取隔离相关的配置项。</p><h3 id="engines" style="position:relative"><code>engines</code><a href="#engines" aria-label="engines permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>用于控制 TiDB 节点允许从哪种类型的引擎读取数据。</li><li>默认值：["tikv", "tiflash", "tidb"]，表示由优化器自动选择存储引擎。</li><li>可选值："tikv", "tiflash", "tidb" 的组合，如：["tikv", "tidb"]、["tiflash", "tidb"]。</li></ul><h2 id="instance" style="position:relative">instance<a href="#instance" aria-label="instance permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h2><h3 id="tidb_enable_collect_execution_info" style="position:relative"><code>tidb_enable_collect_execution_info</code><a href="#tidb_enable_collect_execution_info" aria-label="tidb_enable_collect_execution_info permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>用于控制是否同时将各个执行算子的执行信息记录入 slow query log 中，以及是否维护<a href="/zh/tidb/stable/information-schema-tidb-index-usage">访问索引有关的统计信息</a>。</li><li>默认值：true</li><li>在 v6.1.0 之前，该功能通过配置项 <code>enable-collect-execution-info</code> 进行设置。</li></ul><h3 id="tidb_enable_slow_log" style="position:relative"><code>tidb_enable_slow_log</code><a href="#tidb_enable_slow_log" aria-label="tidb_enable_slow_log permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>是否开启慢查询日志。</li><li>默认值：true</li><li>可以设置成 <code>true</code> 或 <code>false</code> 来启用或禁用慢查询日志。</li><li>在 v6.1.0 之前，该功能通过配置项 <code>enable-slow-log</code> 进行设置。</li></ul><h3 id="tidb_slow_log_threshold" style="position:relative"><code>tidb_slow_log_threshold</code><a href="#tidb_slow_log_threshold" aria-label="tidb_slow_log_threshold permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>输出慢日志的耗时阈值。</li><li>默认值：300</li><li>范围：<code>[-1, 9223372036854775807]</code></li><li>单位：毫秒</li><li>如果查询耗时大于这个值，会视作一个慢查询，并记录到慢查询日志。注意，当日志的输出级别 <a href="#level"><code>log.level</code></a> 是 <code>"debug"</code> 时，所有查询都会记录到慢日志，不受该参数的限制。</li><li>在 v6.1.0 之前，该功能通过配置项 <code>slow-threshold</code> 进行设置。</li></ul><h3 id="in-mem-slow-query-topn-num-span-classversion-mark从-v730-版本开始引入span" style="position:relative"><code>in-mem-slow-query-topn-num</code> <span class="version-mark">从 v7.3.0 版本开始引入</span><a href="#in-mem-slow-query-topn-num-span-classversion-mark%E4%BB%8E-v730-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="in mem slow query topn num span classversion mark从 v730 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>缓存在内存中的最慢的 slow query 个数。</li><li>默认值：30</li></ul><h3 id="in-mem-slow-query-recent-num-span-classversion-mark从-v730-版本开始引入span" style="position:relative"><code>in-mem-slow-query-recent-num</code> <span class="version-mark">从 v7.3.0 版本开始引入</span><a href="#in-mem-slow-query-recent-num-span-classversion-mark%E4%BB%8E-v730-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="in mem slow query recent num span classversion mark从 v730 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>缓存在内存中的最近使用的 slow query 个数。</li><li>默认值：500</li></ul><h3 id="tidb_expensive_query_time_threshold" style="position:relative"><code>tidb_expensive_query_time_threshold</code><a href="#tidb_expensive_query_time_threshold" aria-label="tidb_expensive_query_time_threshold permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>控制打印 expensive query 日志的阈值时间，默认值是 60 秒。expensive query 日志和慢日志的差别是，慢日志是在语句执行完后才打印，expensive query 日志可以把正在执行中且执行时间超过该阈值的语句及其相关信息打印出来。</li><li>默认值：60</li><li>范围：<code>[10, 2147483647]</code></li><li>单位：秒</li><li>在 v5.4.0 之前，该功能通过配置项 <code>expensive-threshold</code> 进行设置。</li></ul><h3 id="tidb_record_plan_in_slow_log" style="position:relative"><code>tidb_record_plan_in_slow_log</code><a href="#tidb_record_plan_in_slow_log" aria-label="tidb_record_plan_in_slow_log permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>在慢日志中记录执行计划。</li><li>默认值：1</li><li>0 表示关闭，1 表示开启，默认开启，该值作为系统变量 <a href="/zh/tidb/stable/system-variables#tidb_record_plan_in_slow_log"><code>tidb_record_plan_in_slow_log</code></a> 的初始值。</li><li>在 v6.1.0 之前，该功能通过配置项 <code>record-plan-in-slow-log</code> 进行设置。</li></ul><h3 id="tidb_force_priority" style="position:relative"><code>tidb_force_priority</code><a href="#tidb_force_priority" aria-label="tidb_force_priority permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>把所有的语句优先级设置为系统变量 <code>tidb_force_priority</code> 的值。</li><li>默认值：NO_PRIORITY</li><li>默认值 NO_PRIORITY 表示不强制改变执行语句的优先级，其它优先级从低到高可设置为 LOW_PRIORITY、DELAYED 或 HIGH_PRIORITY。</li><li>在 v6.1.0 之前，该功能通过配置项 <code>force-priority</code> 进行设置。</li></ul><div class="MuiBox-root css-1weqspv"><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardInfo MuiAlert-standard css-1bzshic" role="alert"><div class="MuiAlert-icon css-1l54tgj"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="InfoOutlinedIcon"><path d="M11,9H13V7H11M12,20C7.59,20 4,16.41 4,12C4,7.59 7.59,4 12,4C16.41,4 20,7.59 20, 12C20,16.41 16.41,20 12,20M12,2A10,10 0 0,0 2,12A10,10 0 0,0 12,22A10,10 0 0,0 22,12A10, 10 0 0,0 12,2M11,17H13V11H11V17Z"/></svg></div><div class="MuiAlert-message css-1xsto0d"><div class="MuiTypography-root MuiTypography-body1 MuiTypography-gutterBottom MuiAlertTitle-root css-m00e13">注意</div><p>TiDB 从 v6.6.0 版本开始支持<a href="/zh/tidb/stable/tidb-resource-control">使用资源管控 (Resource Control) 实现资源隔离</a>功能。该功能可以将不同优先级的语句放在不同的资源组中执行，并为这些资源组分配不同的配额和优先级，可以达到更好的资源管控效果。在开启资源管控功能后，语句的调度主要受资源组的控制，<code>PRIORITY</code> 将不再生效。建议在支持资源管控的版本优先使用资源管控功能。</p></div></div></div><h3 id="max_connections" style="position:relative"><code>max_connections</code><a href="#max_connections" aria-label="max_connections permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>TiDB 中同时允许的最大客户端连接数，用于资源控制。</li><li>默认值：0</li><li>取值范围：<code>[0, 100000]</code></li><li>默认情况下，TiDB 不限制客户端连接数。当本配置项的值大于 <code>0</code> 且客户端连接数到达此值时，TiDB 服务端将会拒绝新的客户端连接。</li><li>该值作为系统变量 <a href="/zh/tidb/stable/system-variables#max_connections"><code>max_connections</code></a> 的初始值。</li><li>在 v6.2.0 之前，该功能通过配置项 <code>max-server-connections</code> 进行设置。</li></ul><h3 id="tidb_enable_ddl" style="position:relative"><code>tidb_enable_ddl</code><a href="#tidb_enable_ddl" aria-label="tidb_enable_ddl permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>用于表示该 tidb-server 是否可以成为 DDL owner。</li><li>默认值：true</li><li>该值作为系统变量 <a href="/zh/tidb/stable/system-variables#tidb_enable_ddl-从-v630-版本开始引入"><code>tidb_enable_ddl</code></a> 的初始值。</li><li>在 v6.3.0 之前，该功能由配置项 <code>run-ddl</code> 进行设置。</li></ul><h3 id="tidb_stmt_summary_enable_persistent-span-classversion-mark从-v660-版本开始引入span" style="position:relative"><code>tidb_stmt_summary_enable_persistent</code> <span class="version-mark">从 v6.6.0 版本开始引入</span><a href="#tidb_stmt_summary_enable_persistent-span-classversion-mark%E4%BB%8E-v660-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="tidb_stmt_summary_enable_persistent span classversion mark从 v660 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><div class="MuiBox-root css-1weqspv"><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardError MuiAlert-standard css-kdwypz" role="alert"><div class="MuiAlert-icon css-1l54tgj"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ErrorOutlineIcon"><path d="M11 15h2v2h-2zm0-8h2v6h-2zm.99-5C6.47 2 2 6.48 2 12s4.47 10 9.99 10C17.52 22 22 17.52 22 12S17.52 2 11.99 2zM12 20c-4.42 0-8-3.58-8-8s3.58-8 8-8 8 3.58 8 8-3.58 8-8 8z"/></svg></div><div class="MuiAlert-message css-1xsto0d"><div class="MuiTypography-root MuiTypography-body1 MuiTypography-gutterBottom MuiAlertTitle-root css-m00e13">警告</div><p>statements summary 持久化目前为实验特性，不建议在生产环境中使用。该功能可能会在未事先通知的情况下发生变化或删除。如果发现 bug，请在 GitHub 上提 <a href="https://github.com/pingcap/tidb/issues" target="_blank" referrerpolicy="no-referrer-when-downgrade">issue</a> 反馈。</p></div></div></div><ul><li>用于控制是否开启 statements summary 持久化。</li><li>默认值：false</li><li>详情参考<a href="/zh/tidb/stable/statement-summary-tables#持久化-statements-summary">持久化 statements summary</a>。</li></ul><h3 id="tidb_stmt_summary_filename-span-classversion-mark从-v660-版本开始引入span" style="position:relative"><code>tidb_stmt_summary_filename</code> <span class="version-mark">从 v6.6.0 版本开始引入</span><a href="#tidb_stmt_summary_filename-span-classversion-mark%E4%BB%8E-v660-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="tidb_stmt_summary_filename span classversion mark从 v660 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><div class="MuiBox-root css-1weqspv"><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardError MuiAlert-standard css-kdwypz" role="alert"><div class="MuiAlert-icon css-1l54tgj"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ErrorOutlineIcon"><path d="M11 15h2v2h-2zm0-8h2v6h-2zm.99-5C6.47 2 2 6.48 2 12s4.47 10 9.99 10C17.52 22 22 17.52 22 12S17.52 2 11.99 2zM12 20c-4.42 0-8-3.58-8-8s3.58-8 8-8 8 3.58 8 8-3.58 8-8 8z"/></svg></div><div class="MuiAlert-message css-1xsto0d"><div class="MuiTypography-root MuiTypography-body1 MuiTypography-gutterBottom MuiAlertTitle-root css-m00e13">警告</div><p>statements summary 持久化目前为实验特性，不建议在生产环境中使用。该功能可能会在未事先通知的情况下发生变化或删除。如果发现 bug，请在 GitHub 上提 <a href="https://github.com/pingcap/tidb/issues" target="_blank" referrerpolicy="no-referrer-when-downgrade">issue</a> 反馈。</p></div></div></div><ul><li>当开启了 statements summary 持久化时，该配置用于指定持久化数据所写入的文件。</li><li>默认值："tidb-statements.log"</li></ul><h3 id="tidb_stmt_summary_file_max_days-span-classversion-mark从-v660-版本开始引入span" style="position:relative"><code>tidb_stmt_summary_file_max_days</code> <span class="version-mark">从 v6.6.0 版本开始引入</span><a href="#tidb_stmt_summary_file_max_days-span-classversion-mark%E4%BB%8E-v660-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="tidb_stmt_summary_file_max_days span classversion mark从 v660 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><div class="MuiBox-root css-1weqspv"><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardError MuiAlert-standard css-kdwypz" role="alert"><div class="MuiAlert-icon css-1l54tgj"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ErrorOutlineIcon"><path d="M11 15h2v2h-2zm0-8h2v6h-2zm.99-5C6.47 2 2 6.48 2 12s4.47 10 9.99 10C17.52 22 22 17.52 22 12S17.52 2 11.99 2zM12 20c-4.42 0-8-3.58-8-8s3.58-8 8-8 8 3.58 8 8-3.58 8-8 8z"/></svg></div><div class="MuiAlert-message css-1xsto0d"><div class="MuiTypography-root MuiTypography-body1 MuiTypography-gutterBottom MuiAlertTitle-root css-m00e13">警告</div><p>statements summary 持久化目前为实验特性，不建议在生产环境中使用。该功能可能会在未事先通知的情况下发生变化或删除。如果发现 bug，请在 GitHub 上提 <a href="https://github.com/pingcap/tidb/issues" target="_blank" referrerpolicy="no-referrer-when-downgrade">issue</a> 反馈。</p></div></div></div><ul><li>当开启了 statements summary 持久化时，该配置用于指定持久化数据文件所保留的最大天数。</li><li>默认值：3</li><li>单位：天</li><li>可结合数据保留时长需求与磁盘空间占用适当调整。</li></ul><h3 id="tidb_stmt_summary_file_max_size-span-classversion-mark从-v660-版本开始引入span" style="position:relative"><code>tidb_stmt_summary_file_max_size</code> <span class="version-mark">从 v6.6.0 版本开始引入</span><a href="#tidb_stmt_summary_file_max_size-span-classversion-mark%E4%BB%8E-v660-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="tidb_stmt_summary_file_max_size span classversion mark从 v660 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><div class="MuiBox-root css-1weqspv"><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardError MuiAlert-standard css-kdwypz" role="alert"><div class="MuiAlert-icon css-1l54tgj"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ErrorOutlineIcon"><path d="M11 15h2v2h-2zm0-8h2v6h-2zm.99-5C6.47 2 2 6.48 2 12s4.47 10 9.99 10C17.52 22 22 17.52 22 12S17.52 2 11.99 2zM12 20c-4.42 0-8-3.58-8-8s3.58-8 8-8 8 3.58 8 8-3.58 8-8 8z"/></svg></div><div class="MuiAlert-message css-1xsto0d"><div class="MuiTypography-root MuiTypography-body1 MuiTypography-gutterBottom MuiAlertTitle-root css-m00e13">警告</div><p>statements summary 持久化目前为实验特性，不建议在生产环境中使用。该功能可能会在未事先通知的情况下发生变化或删除。如果发现 bug，请在 GitHub 上提 <a href="https://github.com/pingcap/tidb/issues" target="_blank" referrerpolicy="no-referrer-when-downgrade">issue</a> 反馈。</p></div></div></div><ul><li>当开启了 statements summary 持久化时，该配置用于限制持久化数据单个文件的大小。</li><li>默认值：64</li><li>单位：MiB</li><li>可结合数据保留时长需求与磁盘空间占用适当调整。</li></ul><h3 id="tidb_stmt_summary_file_max_backups-span-classversion-mark从-v660-版本开始引入span" style="position:relative"><code>tidb_stmt_summary_file_max_backups</code> <span class="version-mark">从 v6.6.0 版本开始引入</span><a href="#tidb_stmt_summary_file_max_backups-span-classversion-mark%E4%BB%8E-v660-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="tidb_stmt_summary_file_max_backups span classversion mark从 v660 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><div class="MuiBox-root css-1weqspv"><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardError MuiAlert-standard css-kdwypz" role="alert"><div class="MuiAlert-icon css-1l54tgj"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ErrorOutlineIcon"><path d="M11 15h2v2h-2zm0-8h2v6h-2zm.99-5C6.47 2 2 6.48 2 12s4.47 10 9.99 10C17.52 22 22 17.52 22 12S17.52 2 11.99 2zM12 20c-4.42 0-8-3.58-8-8s3.58-8 8-8 8 3.58 8 8-3.58 8-8 8z"/></svg></div><div class="MuiAlert-message css-1xsto0d"><div class="MuiTypography-root MuiTypography-body1 MuiTypography-gutterBottom MuiAlertTitle-root css-m00e13">警告</div><p>statements summary 持久化目前为实验特性，不建议在生产环境中使用。该功能可能会在未事先通知的情况下发生变化或删除。如果发现 bug，请在 GitHub 上提 <a href="https://github.com/pingcap/tidb/issues" target="_blank" referrerpolicy="no-referrer-when-downgrade">issue</a> 反馈。</p></div></div></div><ul><li>当开启了 statements summary 持久化时，该配置用于限制持久化数据文件最大数量，<code>0</code> 表示不限制。</li><li>默认值：0</li><li>可结合数据保留时长需求与磁盘空间占用适当调整。</li></ul><h2 id="proxy-protocol" style="position:relative">proxy-protocol<a href="#proxy-protocol" aria-label="proxy protocol permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h2><p>PROXY 协议相关的配置项。</p><h3 id="networks" style="position:relative"><code>networks</code><a href="#networks" aria-label="networks permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>允许使用 <a href="https://www.haproxy.org/download/1.8/doc/proxy-protocol.txt" target="_blank" referrerpolicy="no-referrer-when-downgrade">PROXY 协议</a>连接 TiDB 的代理服务器地址列表。</li><li>默认值：""</li><li>通常情况下，通过反向代理使用 TiDB 时，TiDB 会将反向代理服务器的 IP 地址视为客户端 IP 地址。对于支持 PROXY 协议的反向代理（如 HAProxy），开启 PROXY 协议后能让反向代理透传客户端真实的 IP 地址给 TiDB。</li><li>配置该参数后，TiDB 将允许配置的源 IP 地址使用 PROXY 协议连接到 TiDB，且拒绝这些源 IP 地址使用非 PROXY 协议连接。若该参数为空，则任何源 IP 地址都不能使用 PROXY 协议连接到 TiDB。地址可以使用 IP 地址格式 (192.168.1.50) 或者 CIDR 格式 (192.168.1.0/24)，并可用 <code>,</code> 分隔多个地址，或用 <code>*</code> 代表所有 IP 地址。</li></ul><div class="MuiBox-root css-1weqspv"><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardError MuiAlert-standard css-kdwypz" role="alert"><div class="MuiAlert-icon css-1l54tgj"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ErrorOutlineIcon"><path d="M11 15h2v2h-2zm0-8h2v6h-2zm.99-5C6.47 2 2 6.48 2 12s4.47 10 9.99 10C17.52 22 22 17.52 22 12S17.52 2 11.99 2zM12 20c-4.42 0-8-3.58-8-8s3.58-8 8-8 8 3.58 8 8-3.58 8-8 8z"/></svg></div><div class="MuiAlert-message css-1xsto0d"><div class="MuiTypography-root MuiTypography-body1 MuiTypography-gutterBottom MuiAlertTitle-root css-m00e13">警告</div><p>需谨慎使用 <code>*</code> 符号，因为 <code>*</code> 允许来自任何 IP 的客户端自行汇报其 IP 地址，从而可能引入安全风险。另外，<code>*</code> 可能导致部分直接连接 TiDB 的内部组件无法使用，例如 TiDB Dashboard。</p></div></div></div><h3 id="fallbackable-span-classversion-mark从-v651-版本开始引入span" style="position:relative"><code>fallbackable</code> <span class="version-mark">从 v6.5.1 版本开始引入</span><a href="#fallbackable-span-classversion-mark%E4%BB%8E-v651-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="fallbackable span classversion mark从 v651 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>用于控制是否启用 PROXY 协议回退模式。如果设置为 <code>true</code>，TiDB 可以接受属于 <code>proxy-protocol.networks</code> 的客户端使用非 PROXY 协议规范或者没有发送 PROXY 协议头的客户端连接。默认情况下，TiDB 仅接受属于 <code>proxy-protocol.networks</code> 的客户端发送 PROXY 协议头的客户端连接。</li><li>默认：<code>false</code></li></ul><h2 id="experimental" style="position:relative">experimental<a href="#experimental" aria-label="experimental permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h2><p>experimental 部分为 TiDB 实验功能相关的配置。该部分从 v3.1.0 开始引入。</p><h3 id="allow-expression-index-span-classversion-mark从-v400-版本开始引入span" style="position:relative"><code>allow-expression-index</code> <span class="version-mark">从 v4.0.0 版本开始引入</span><a href="#allow-expression-index-span-classversion-mark%E4%BB%8E-v400-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5span" aria-label="allow expression index span classversion mark从 v400 版本开始引入span permalink" class="anchor after"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a></h3><ul><li>用于控制是否能创建表达式索引。自 v5.2.0 版本起，如果表达式中的函数是安全的，你可以直接基于该函数创建表达式索引，不需要打开该配置项。如果要创建基于其他函数的表达式索引，可以打开该配置项，但可能存在正确性问题。通过查询 <code>tidb_allow_function_for_expression_index</code> 变量可得到能直接用于创建表达式的安全函数。</li><li>默认值：false</li></ul></div></div><div class="MuiBox-root css-0"><h2 class="MuiTypography-root MuiTypography-h2 css-ys9aki">文档内容是否有帮助？</h2><div class="css-n4khra"><button class="MuiButtonBase-root MuiButton-root MuiButton-outlined MuiButton-outlinedPrimary MuiButton-sizeSmall MuiButton-outlinedSizeSmall MuiButton-disableElevation FeedbackBtn-thumbUp css-7nfhq0" tabindex="0" type="button" aria-label="Thumb Up"><span class="MuiButton-startIcon MuiButton-iconSizeSmall css-16rzsu1"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium css-11aslls" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ThumbUpOutlinedIcon"><path d="M9 21h9c.83 0 1.54-.5 1.84-1.22l3.02-7.05c.09-.23.14-.47.14-.73v-2c0-1.1-.9-2-2-2h-6.31l.95-4.57.03-.32c0-.41-.17-.79-.44-1.06L14.17 1 7.58 7.59C7.22 7.95 7 8.45 7 9v10c0 1.1.9 2 2 2zM9 9l4.34-4.34L12 10h9v2l-3 7H9V9zM1 9h4v12H1z"/></svg></span>是</button><button class="MuiButtonBase-root MuiButton-root MuiButton-outlined MuiButton-outlinedPrimary MuiButton-sizeSmall MuiButton-outlinedSizeSmall MuiButton-disableElevation FeedbackBtn-thumbDown css-7nfhq0" tabindex="0" type="button" aria-label="Thumb Down"><span class="MuiButton-startIcon MuiButton-iconSizeSmall css-16rzsu1"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium css-11aslls" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ThumbDownOutlinedIcon"><path d="M15 3H6c-.83 0-1.54.5-1.84 1.22l-3.02 7.05c-.09.23-.14.47-.14.73v2c0 1.1.9 2 2 2h6.31l-.95 4.57-.03.32c0 .41.17.79.44 1.06L9.83 23l6.59-6.59c.36-.36.58-.86.58-1.41V5c0-1.1-.9-2-2-2zm0 12-4.34 4.34L12 14H3v-2l3-7h9v10zm4-12h4v12h-4z"/></svg></span>否</button></div></div></div><div class="MuiBox-root css-tirkga"><div class="MuiBox-root css-17wsg14"><div class="css-l5c1s3"><a class="MuiTypography-root MuiTypography-body1 css-1bdwzty" href="https://download.pingcap.org/tidb-stable-zh-manual.pdf" target="_blank" icon="[object Object]" rel="noreferrer" download=""><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium css-1dzhlmu" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="SimCardDownloadIcon"><path d="M18 2h-8L4 8v12c0 1.1.9 2 2 2h12c1.1 0 2-.9 2-2V4c0-1.1-.9-2-2-2zm-6 15-4-4h3V9.02L13 9v4h3l-4 4z"/></svg>下载 PDF</a><a class="MuiTypography-root MuiTypography-body1 css-1bdwzty" href="https://github.com/pingcap/docs-cn/issues/new?body=File:%20[/release-8.1/tidb-configuration-file.md](https://docs.pingcap.com/zh/tidb/stable/tidb-configuration-file)" target="_blank" icon="[object Object]" rel="noreferrer"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium css-1dzhlmu" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="GitHubIcon"><path d="M12 1.27a11 11 0 00-3.48 21.46c.55.09.73-.28.73-.55v-1.84c-3.03.64-3.67-1.46-3.67-1.46-.55-1.29-1.28-1.65-1.28-1.65-.92-.65.1-.65.1-.65 1.1 0 1.73 1.1 1.73 1.1.92 1.65 2.57 1.2 3.21.92a2 2 0 01.64-1.47c-2.47-.27-5.04-1.19-5.04-5.5 0-1.1.46-2.1 1.2-2.84a3.76 3.76 0 010-2.93s.91-.28 3.11 1.1c1.8-.49 3.7-.49 5.5 0 2.1-1.38 3.02-1.1 3.02-1.1a3.76 3.76 0 010 2.93c.83.74 1.2 1.74 1.2 2.94 0 4.21-2.57 5.13-5.04 5.4.45.37.82.92.82 2.02v3.03c0 .27.1.64.73.55A11 11 0 0012 1.27"/></svg>文档反馈</a><a class="MuiTypography-root MuiTypography-body1 css-1bdwzty" href="https://asktug.com/?utm_source=doc" target="_blank" icon="[object Object]" rel="noreferrer"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium css-1dzhlmu" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="QuestionAnswerIcon"><path d="M21 6h-2v9H6v2c0 .55.45 1 1 1h11l4 4V7c0-.55-.45-1-1-1zm-4 6V3c0-.55-.45-1-1-1H3c-.55 0-1 .45-1 1v14l4-4h10c.55 0 1-.45 1-1z"/></svg>社区交流</a></div><nav class="MuiBox-root css-0" id="toc-container" aria-label="toc"><div class="MuiTypography-root MuiTypography-body1 css-12fnzc7">本页导航</div><ul class="MuiTypography-root MuiTypography-body1 css-12txbxl"><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-1ob1623"/><ul class="MuiTypography-root MuiTypography-body1 css-12txbxl"><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#split-table">split-table</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#tidb-max-reuse-chunk-从-v640-版本开始引入">tidb-max-reuse-chunk 从 v6.4.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#tidb-max-reuse-column-从-v640-版本开始引入">tidb-max-reuse-column 从 v6.4.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#token-limit">token-limit</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#temp-dir-从-v630-版本开始引入">temp-dir 从 v6.3.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#oom-use-tmp-storage">oom-use-tmp-storage</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#tmp-storage-path">tmp-storage-path</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#tmp-storage-quota">tmp-storage-quota</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#lease">lease</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#compatible-kill-query">compatible-kill-query</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#check-mb4-value-in-utf8">check-mb4-value-in-utf8</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#treat-old-version-utf8-as-utf8mb4">treat-old-version-utf8-as-utf8mb4</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#alter-primary-key已废弃">alter-primary-key（已废弃）</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#server-version">server-version</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#repair-mode">repair-mode</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#repair-table-list">repair-table-list</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#new_collations_enabled_on_first_bootstrap">new_collations_enabled_on_first_bootstrap</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#max-server-connections">max-server-connections</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#max-index-length">max-index-length</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#table-column-count-limit-从-v50-版本开始引入">table-column-count-limit 从 v5.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#index-limit-从-v50-版本开始引入">index-limit 从 v5.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#enable-telemetry-从-v402-版本开始引入从-v810-版本开始废弃">enable-telemetry 从 v4.0.2 版本开始引入，从 v8.1.0 版本开始废弃</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#deprecate-integer-display-length">deprecate-integer-display-length</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#enable-tcp4-only-从-v50-版本开始引入">enable-tcp4-only 从 v5.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#enable-enum-length-limit-从-v50-版本开始引入">enable-enum-length-limit 从 v5.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#graceful-wait-before-shutdown-从-v50-版本开始引入">graceful-wait-before-shutdown 从 v5.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#enable-global-kill-从-v610-版本开始引入">enable-global-kill 从 v6.1.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#enable-32bits-connection-id-从-v730-版本开始引入">enable-32bits-connection-id 从 v7.3.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#initialize-sql-file-从-v660-版本开始引入">initialize-sql-file 从 v6.6.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#enable-forwarding-从-v500-版本开始引入">enable-forwarding 从 v5.0.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#enable-table-lock-从-v400-版本开始引入">enable-table-lock 从 v4.0.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#labels">labels</a></li></ul></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-1ob1623" href="#log">log</a><ul class="MuiTypography-root MuiTypography-body1 css-12txbxl"><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#level">level</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#format">format</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#enable-timestamp">enable-timestamp</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#enable-slow-log">enable-slow-log</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#slow-query-file">slow-query-file</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#slow-threshold">slow-threshold</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#record-plan-in-slow-log">record-plan-in-slow-log</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#expensive-threshold">expensive-threshold</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#general-log-file-从-v800-版本开始引入">general-log-file 从 v8.0.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#timeout-从-v710-版本开始引入">timeout 从 v7.1.0 版本开始引入</a></li></ul></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-1ob1623" href="#logfile">log.file</a><ul class="MuiTypography-root MuiTypography-body1 css-12txbxl"><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr"/><ul class="MuiTypography-root MuiTypography-body1 css-12txbxl"><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-snjii5" href="#filename">filename</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-snjii5" href="#max-size">max-size</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-snjii5" href="#max-days">max-days</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-snjii5" href="#max-backups">max-backups</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-snjii5" href="#compression-从-v800-版本开始引入">compression 从 v8.0.0 版本开始引入</a></li></ul></li></ul></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-1ob1623" href="#security">security</a><ul class="MuiTypography-root MuiTypography-body1 css-12txbxl"><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#enable-sem">enable-sem</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#ssl-ca">ssl-ca</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#ssl-cert">ssl-cert</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#ssl-key">ssl-key</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#cluster-ssl-ca">cluster-ssl-ca</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#cluster-ssl-cert">cluster-ssl-cert</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#cluster-ssl-key">cluster-ssl-key</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#spilled-file-encryption-method">spilled-file-encryption-method</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#auto-tls">auto-tls</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#tls-version">tls-version</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#auth-token-jwks-从-v640-版本开始引入">auth-token-jwks 从 v6.4.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#auth-token-refresh-interval-从-v640-版本开始引入">auth-token-refresh-interval 从 v6.4.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#disconnect-on-expired-password-从-v650-版本开始引入">disconnect-on-expired-password 从 v6.5.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#session-token-signing-cert-从-v640-版本开始引入">session-token-signing-cert 从 v6.4.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#session-token-signing-key-从-v640-版本开始引入">session-token-signing-key 从 v6.4.0 版本开始引入</a></li></ul></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-1ob1623" href="#performance">performance</a><ul class="MuiTypography-root MuiTypography-body1 css-12txbxl"><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#max-procs">max-procs</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#server-memory-quota-从-v409-版本开始引入">server-memory-quota 从 v4.0.9 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#txn-entry-size-limit-从-v4010-和-v500-版本开始引入">txn-entry-size-limit 从 v4.0.10 和 v5.0.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#txn-total-size-limit">txn-total-size-limit</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#max-txn-ttl">max-txn-ttl</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#stmt-count-limit">stmt-count-limit</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#tcp-keep-alive">tcp-keep-alive</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#tcp-no-delay">tcp-no-delay</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#cross-join">cross-join</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#stats-lease">stats-lease</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#pseudo-estimate-ratio">pseudo-estimate-ratio</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#force-priority">force-priority</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#distinct-agg-push-down">distinct-agg-push-down</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#enforce-mpp">enforce-mpp</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#stats-load-concurrency-从-v540-版本开始引入">stats-load-concurrency 从 v5.4.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#stats-load-queue-size-从-v540-版本开始引入">stats-load-queue-size 从 v5.4.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#enable-stats-cache-mem-quota-从-v610-版本开始引入">enable-stats-cache-mem-quota 从 v6.1.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#concurrently-init-stats-从-v810-和-v752-版本开始引入">concurrently-init-stats 从 v8.1.0 和 v7.5.2 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#lite-init-stats-从-v710-版本开始引入">lite-init-stats 从 v7.1.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#force-init-stats-从-v657-和-v710-版本开始引入">force-init-stats 从 v6.5.7 和 v7.1.0 版本开始引入</a></li></ul></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-1ob1623" href="#opentracing">opentracing</a><ul class="MuiTypography-root MuiTypography-body1 css-12txbxl"><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#enable">enable</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#rpc-metrics">rpc-metrics</a></li></ul></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-1ob1623" href="#opentracingsampler">opentracing.sampler</a><ul class="MuiTypography-root MuiTypography-body1 css-12txbxl"><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#type">type</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#param">param</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#sampling-server-url">sampling-server-url</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#max-operations">max-operations</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#sampling-refresh-interval">sampling-refresh-interval</a></li></ul></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-1ob1623" href="#opentracingreporter">opentracing.reporter</a><ul class="MuiTypography-root MuiTypography-body1 css-12txbxl"><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#queue-size">queue-size</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#buffer-flush-interval">buffer-flush-interval</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#log-spans">log-spans</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#local-agent-host-port">local-agent-host-port</a></li></ul></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-1ob1623" href="#tikv-client">tikv-client</a><ul class="MuiTypography-root MuiTypography-body1 css-12txbxl"><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#grpc-connection-count">grpc-connection-count</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#grpc-keepalive-time">grpc-keepalive-time</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#grpc-keepalive-timeout">grpc-keepalive-timeout</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#grpc-compression-type">grpc-compression-type</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#commit-timeout">commit-timeout</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#max-batch-size">max-batch-size</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#max-batch-wait-time">max-batch-wait-time</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#batch-wait-size">batch-wait-size</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#overload-threshold">overload-threshold</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#copr-req-timeout-从-v750-版本开始引入">copr-req-timeout 从 v7.5.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#enable-replica-selector-v2-从-v800-版本开始引入">enable-replica-selector-v2 从 v8.0.0 版本开始引入</a></li></ul></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-1ob1623" href="#tikv-clientcopr-cache-从-v400-版本开始引入">tikv-client.copr-cache 从 v4.0.0 版本开始引入</a><ul class="MuiTypography-root MuiTypography-body1 css-12txbxl"><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#capacity-mb">capacity-mb</a></li></ul></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-1ob1623" href="#txn-local-latches">txn-local-latches</a><ul class="MuiTypography-root MuiTypography-body1 css-12txbxl"><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#enabled">enabled</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#capacity">capacity</a></li></ul></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-1ob1623" href="#binlog">binlog</a><ul class="MuiTypography-root MuiTypography-body1 css-12txbxl"><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#enable-1">enable</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#write-timeout">write-timeout</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#ignore-error">ignore-error</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#binlog-socket">binlog-socket</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#strategy">strategy</a></li></ul></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-1ob1623" href="#status">status</a><ul class="MuiTypography-root MuiTypography-body1 css-12txbxl"><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#report-status">report-status</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#record-db-qps">record-db-qps</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#record-db-label">record-db-label</a></li></ul></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-1ob1623" href="#pessimistic-txn">pessimistic-txn</a><ul class="MuiTypography-root MuiTypography-body1 css-12txbxl"><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#max-retry-count">max-retry-count</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#deadlock-history-capacity">deadlock-history-capacity</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#deadlock-history-collect-retryable">deadlock-history-collect-retryable</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#pessimistic-auto-commit">pessimistic-auto-commit</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#constraint-check-in-place-pessimistic-从-v640-版本开始引入">constraint-check-in-place-pessimistic 从 v6.4.0 版本开始引入</a></li></ul></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-1ob1623" href="#isolation-read">isolation-read</a><ul class="MuiTypography-root MuiTypography-body1 css-12txbxl"><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#engines">engines</a></li></ul></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-1ob1623" href="#instance">instance</a><ul class="MuiTypography-root MuiTypography-body1 css-12txbxl"><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#tidb_enable_collect_execution_info">tidb_enable_collect_execution_info</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#tidb_enable_slow_log">tidb_enable_slow_log</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#tidb_slow_log_threshold">tidb_slow_log_threshold</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#in-mem-slow-query-topn-num-从-v730-版本开始引入">in-mem-slow-query-topn-num 从 v7.3.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#in-mem-slow-query-recent-num-从-v730-版本开始引入">in-mem-slow-query-recent-num 从 v7.3.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#tidb_expensive_query_time_threshold">tidb_expensive_query_time_threshold</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#tidb_record_plan_in_slow_log">tidb_record_plan_in_slow_log</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#tidb_force_priority">tidb_force_priority</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#max_connections">max_connections</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#tidb_enable_ddl">tidb_enable_ddl</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#tidb_stmt_summary_enable_persistent-从-v660-版本开始引入">tidb_stmt_summary_enable_persistent 从 v6.6.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#tidb_stmt_summary_filename-从-v660-版本开始引入">tidb_stmt_summary_filename 从 v6.6.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#tidb_stmt_summary_file_max_days-从-v660-版本开始引入">tidb_stmt_summary_file_max_days 从 v6.6.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#tidb_stmt_summary_file_max_size-从-v660-版本开始引入">tidb_stmt_summary_file_max_size 从 v6.6.0 版本开始引入</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#tidb_stmt_summary_file_max_backups-从-v660-版本开始引入">tidb_stmt_summary_file_max_backups 从 v6.6.0 版本开始引入</a></li></ul></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-1ob1623" href="#proxy-protocol">proxy-protocol</a><ul class="MuiTypography-root MuiTypography-body1 css-12txbxl"><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#networks">networks</a></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#fallbackable-从-v651-版本开始引入">fallbackable 从 v6.5.1 版本开始引入</a></li></ul></li><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-1ob1623" href="#experimental">experimental</a><ul class="MuiTypography-root MuiTypography-body1 css-12txbxl"><li class="MuiTypography-root MuiTypography-body1 css-ae3kd9"><a class="MuiTypography-root MuiTypography-body1 css-140pvdr" href="#allow-expression-index-从-v400-版本开始引入">allow-expression-index 从 v4.0.0 版本开始引入</a></li></ul></li></ul></nav></div></div><div class="MuiBox-root css-uwm08j"><div class="MuiBox-root css-0"><button class="MuiButtonBase-root MuiButton-root MuiButton-outlined MuiButton-outlinedPrimary MuiButton-sizeMedium MuiButton-outlinedSizeMedium MuiButton-disableElevation css-11k53m3" tabindex="0" type="button" id="toc-mobile-button" aria-haspopup="true">本页导航<span class="MuiButton-endIcon MuiButton-iconSizeMedium css-pt151d"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium css-vubbuv" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="KeyboardArrowDownIcon"><path d="M7.41 8.59 12 13.17l4.59-4.58L18 10l-6 6-6-6 1.41-1.41z"/></svg></span></button></div></div></div><div class="MuiBox-root css-1oapptu"/></div></main></div></div><footer class="MuiBox-root css-1nbrgf1"><div class="MuiBox-root css-2n4sq9"><div class="css-ha8tv0"><div class="css-iat7r2"><div class="MuiTypography-root MuiTypography-body1 css-4qoz5v">产品</div><div class="css-1syltr5"><a class="MuiTypography-root MuiTypography-body1 css-asx90z" target="_blank" href="https://cn.pingcap.com/product/#SelectProduct" style="text-decoration:none"><div class="MuiTypography-root MuiTypography-body1 css-94kxj">TiDB</div></a><a class="MuiTypography-root MuiTypography-body1 css-asx90z" target="_blank" href="https://www.pingcap.com/tidb-cloud-serverless/" style="text-decoration:none"><div class="MuiTypography-root MuiTypography-body1 css-94kxj">TiDB Cloud Serverless</div></a><a class="MuiTypography-root MuiTypography-body1 css-asx90z" target="_blank" href="https://www.pingcap.com/tidb-cloud-dedicated/" style="text-decoration:none"><div class="MuiTypography-root MuiTypography-body1 css-94kxj">TiDB Cloud Dedicated</div></a></div></div><div class="css-iat7r2"><div class="MuiTypography-root MuiTypography-body1 css-4qoz5v">生态</div><div class="css-1syltr5"><a class="MuiTypography-root MuiTypography-body1 css-asx90z" target="_blank" href="https://github.com/tikv/tikv" style="text-decoration:none"><div class="MuiTypography-root MuiTypography-body1 css-94kxj">TiKV</div></a><a class="MuiTypography-root MuiTypography-body1 css-asx90z" target="_blank" href="https://github.com/pingcap/tiflash" style="text-decoration:none"><div class="MuiTypography-root MuiTypography-body1 css-94kxj">TiFlash</div></a><a class="MuiTypography-root MuiTypography-body1 css-asx90z" target="_blank" href="https://ossinsight.io/" style="text-decoration:none"><div class="MuiTypography-root MuiTypography-body1 css-94kxj">OSS Insight</div></a></div></div><div class="css-iat7r2"><div class="MuiTypography-root MuiTypography-body1 css-4qoz5v">资源</div><div class="css-1syltr5"><a class="MuiTypography-root MuiTypography-body1 css-asx90z" target="_blank" href="https://docs.pingcap.com/zh/tidb/dev/tidb-roadmap" style="text-decoration:none"><div class="MuiTypography-root MuiTypography-body1 css-94kxj">TiDB 路线图</div></a><a class="MuiTypography-root MuiTypography-body1 css-asx90z" target="_blank" href="https://docs.pingcap.com/zh/tidb/stable/faq-overview" style="text-decoration:none"><div class="MuiTypography-root MuiTypography-body1 css-94kxj">常见问题解答</div></a><a class="MuiTypography-root MuiTypography-body1 css-asx90z" target="_blank" href="https://docs.pingcap.com/zh/tidb/stable/dev-guide-overview" style="text-decoration:none"><div class="MuiTypography-root MuiTypography-body1 css-94kxj">开发者手册</div></a><a class="MuiTypography-root MuiTypography-body1 css-asx90z" target="_blank" href="https://cn.pingcap.com/blog/" style="text-decoration:none"><div class="MuiTypography-root MuiTypography-body1 css-94kxj">博客</div></a><a class="MuiTypography-root MuiTypography-body1 css-asx90z" target="_blank" href="https://cn.pingcap.com/education/" style="text-decoration:none"><div class="MuiTypography-root MuiTypography-body1 css-94kxj">Education</div></a></div></div><div class="css-iat7r2"><div class="MuiTypography-root MuiTypography-body1 css-4qoz5v">支持</div><div class="css-1syltr5"><a class="MuiTypography-root MuiTypography-body1 css-asx90z" target="_blank" href="https://asktug.com" style="text-decoration:none"><div class="MuiTypography-root MuiTypography-body1 css-94kxj">社区</div></a><a class="MuiTypography-root MuiTypography-body1 css-asx90z" target="_blank" href="https://cn.pingcap.com/contact/" style="text-decoration:none"><div class="MuiTypography-root MuiTypography-body1 css-94kxj">联系我们</div></a></div></div><div class="css-iat7r2"><div class="MuiTypography-root MuiTypography-body1 css-4qoz5v">公司</div><div class="css-1syltr5"><a class="MuiTypography-root MuiTypography-body1 css-asx90z" target="_blank" href="https://cn.pingcap.com/about-us?tab=companyOverview" style="text-decoration:none"><div class="MuiTypography-root MuiTypography-body1 css-94kxj">关于我们</div></a><a class="MuiTypography-root MuiTypography-body1 css-asx90z" target="_blank" href="https://careers.pingcap.com" style="text-decoration:none"><div class="MuiTypography-root MuiTypography-body1 css-94kxj">招贤纳士</div></a><a class="MuiTypography-root MuiTypography-body1 css-asx90z" target="_blank" href="https://cn.pingcap.com/company-activity/" style="text-decoration:none"><div class="MuiTypography-root MuiTypography-body1 css-94kxj">新闻报道</div></a></div></div><div class="css-179s9c9"><div class="MuiTypography-root MuiTypography-body1 css-4qoz5v">Stay Connected</div><div class="css-8mv08g"><a class="MuiButtonBase-root MuiIconButton-root MuiIconButton-colorInherit MuiIconButton-sizeMedium css-1deacqj" tabindex="0" aria-label="github" href="https://github.com/pingcap" target="_blank"><svg width="26" height="25" viewbox="0 0 26 25" fill="none"><path d="M13.0234 0.09375C5.85795 0.09375 0.0474854 5.77495 0.0474854 12.7836C0.0474854 18.3904 3.76549 23.1472 8.92122 24.8252C9.56972 24.9427 9.8078 24.5499 9.8078 24.2147C9.8078 23.9121 9.79577 22.9125 9.79018 21.8521C6.18026 22.6198 5.41853 20.3548 5.41853 20.3548C4.82826 18.888 3.97778 18.498 3.97778 18.498C2.80048 17.7104 4.06653 17.7266 4.06653 17.7266C5.36954 17.8159 6.05563 19.0343 6.05563 19.0343C7.21296 20.9743 9.09119 20.4135 9.83165 20.0892C9.94811 19.2692 10.2844 18.709 10.6555 18.3923C7.77335 18.0714 4.7436 16.9833 4.7436 12.1208C4.7436 10.7354 5.25049 9.60332 6.08056 8.71463C5.94583 8.3948 5.50168 7.10431 6.20626 5.35635C6.20626 5.35635 7.2959 5.01529 9.77557 6.65713C10.8106 6.37596 11.9207 6.23495 13.0234 6.23012C14.1262 6.23495 15.2371 6.37596 16.2741 6.65713C18.7507 5.01529 19.8389 5.35635 19.8389 5.35635C20.5452 7.10431 20.1008 8.3948 19.9661 8.71463C20.7981 9.60332 21.3015 10.7354 21.3015 12.1208C21.3015 16.9949 18.266 18.0681 15.3765 18.3822C15.8419 18.776 16.2567 19.5483 16.2567 20.7323C16.2567 22.43 16.2416 23.7966 16.2416 24.2147C16.2416 24.5524 16.4752 24.9481 17.1329 24.8235C22.2859 23.1436 25.9991 18.3885 25.9991 12.7836C25.9991 5.77495 20.1895 0.09375 13.0234 0.09375Z" fill="white"/><path d="M4.96214 18.3138C4.93356 18.377 4.83214 18.3957 4.73974 18.3524C4.64562 18.311 4.59276 18.2251 4.62328 18.1618C4.65121 18.0969 4.75285 18.079 4.84675 18.1221C4.94108 18.1637 4.9948 18.2505 4.96214 18.3138Z" fill="white"/><path d="M5.48764 18.887C5.42576 18.9431 5.30478 18.9171 5.2227 18.8284C5.13782 18.7399 5.12192 18.6216 5.18467 18.5647C5.24848 18.5086 5.36581 18.5348 5.4509 18.6233C5.53577 18.7128 5.55232 18.8303 5.48764 18.887Z" fill="white"/><path d="M5.99931 19.6179C5.9198 19.6719 5.7898 19.6213 5.70944 19.5084C5.62994 19.3956 5.62994 19.2603 5.71116 19.206C5.79174 19.1518 5.9198 19.2006 6.00124 19.3126C6.08053 19.4271 6.08053 19.5626 5.99931 19.6179Z" fill="white"/><path d="M6.70033 20.3239C6.6292 20.4006 6.47772 20.38 6.36684 20.2753C6.25339 20.173 6.2218 20.0278 6.29314 19.9511C6.36512 19.8742 6.51747 19.8958 6.6292 19.9996C6.7418 20.1017 6.77618 20.248 6.70033 20.3239Z" fill="white"/><path d="M7.66729 20.7342C7.63592 20.8336 7.49002 20.8788 7.34304 20.8365C7.19628 20.793 7.10024 20.6766 7.12989 20.5762C7.1604 20.4761 7.30695 20.4291 7.455 20.4743C7.60154 20.5175 7.69781 20.6331 7.66729 20.7342Z" fill="white"/><path d="M8.72911 20.8102C8.73277 20.9149 8.60814 21.0017 8.45386 21.0033C8.29872 21.0069 8.17323 20.9222 8.17151 20.8192C8.17151 20.7135 8.29334 20.6276 8.44848 20.6251C8.60277 20.6221 8.72911 20.7062 8.72911 20.8102Z" fill="white"/><path d="M9.71731 20.6456C9.73578 20.7477 9.62856 20.8526 9.47535 20.8803C9.32473 20.9074 9.18527 20.8444 9.16615 20.7431C9.14745 20.6384 9.25661 20.5336 9.40702 20.5065C9.56045 20.4804 9.69775 20.5418 9.71731 20.6456Z" fill="white"/></svg></a><a class="MuiButtonBase-root MuiIconButton-root MuiIconButton-colorInherit MuiIconButton-sizeMedium css-1deacqj" tabindex="0" aria-label="twitter" href="https://twitter.com/PingCAP" target="_blank"><svg width="26" height="25" viewbox="0 0 26 25" fill="none"><path fill-rule="evenodd" clip-rule="evenodd" d="M13 0C5.8203 0 0 5.59644 0 12.5C0 19.4036 5.8203 25 13 25C20.1797 25 26 19.4036 26 12.5C26 5.59644 20.1797 0 13 0ZM19.0945 5.95801L14.0396 11.8296H14.0393L19.5371 19.8247H15.4938L11.7915 14.4408L7.15642 19.8247H5.9585L11.2597 13.6674L5.9585 5.95801H10.0018L13.5075 11.0562L17.8967 5.95801H19.0945ZM11.8618 12.9677L12.3989 13.7353V13.7356L16.0573 18.9645H17.8973L13.4141 12.5566L12.8769 11.7889L9.428 6.85912H7.58805L11.8618 12.9677Z" fill="white"/></svg></a><a class="MuiButtonBase-root MuiIconButton-root MuiIconButton-colorInherit MuiIconButton-sizeMedium css-1deacqj" tabindex="0" aria-label="linkedin" href="https://linkedin.com/company/pingcap" target="_blank"><svg width="26" height="25" viewbox="0 0 26 25" fill="none"><path fill-rule="evenodd" clip-rule="evenodd" d="M13 0C5.8203 0 0 5.59644 0 12.5C0 19.4036 5.8203 25 13 25C20.1797 25 26 19.4036 26 12.5C26 5.59644 20.1797 0 13 0ZM9.27262 7.72008C9.2535 6.88555 8.63286 6.24992 7.62502 6.24992C6.61718 6.24992 5.95829 6.88555 5.95829 7.72008C5.95829 8.53732 6.59771 9.19125 7.58678 9.19125H7.6056C8.63286 9.19125 9.27262 8.53732 9.27262 7.72008ZM9.07867 10.353H6.13259V18.8643H9.07867V10.353ZM16.3113 10.1531C18.25 10.1531 19.7034 11.3699 19.7034 13.9842L19.7033 18.8643H16.7573V14.3107C16.7573 13.167 16.331 12.3865 15.2645 12.3865C14.4506 12.3865 13.9658 12.9127 13.7528 13.4208C13.6749 13.603 13.6558 13.8567 13.6558 14.1111V18.8645H10.7094C10.7094 18.8645 10.7482 11.1519 10.7094 10.3532H13.6558V11.5588C14.0468 10.9792 14.7471 10.1531 16.3113 10.1531Z" fill="white"/></svg></a><a class="MuiButtonBase-root MuiIconButton-root MuiIconButton-colorInherit MuiIconButton-sizeMedium css-1deacqj" tabindex="0" aria-label="facebook" href="https://facebook.com/pingcap2015" target="_blank"><svg width="26" height="25" viewbox="0 0 26 25" fill="none"><path fill-rule="evenodd" clip-rule="evenodd" d="M13 0C5.8203 0 0 5.59644 0 12.5C0 19.4036 5.8203 25 13 25C20.1797 25 26 19.4036 26 12.5C26 5.59644 20.1797 0 13 0ZM14.1384 13.049V19.8496H11.212V13.0493H9.75004V10.7057H11.212V9.29865C11.212 7.38679 12.0376 6.24992 14.383 6.24992H16.3357V8.59373H15.1151C14.2021 8.59373 14.1417 8.92124 14.1417 9.53248L14.1384 10.7054H16.3495L16.0908 13.049H14.1384Z" fill="white"/></svg></a><a class="MuiButtonBase-root MuiIconButton-root MuiIconButton-colorInherit MuiIconButton-sizeMedium css-1deacqj" tabindex="0" aria-label="slack" href="https://slack.tidb.io/invite?team=tidb-community&amp;channel=everyone&amp;ref=pingcap-docs" target="_blank"><svg width="26" height="25" viewbox="0 0 26 25" fill="none"><path fill-rule="evenodd" clip-rule="evenodd" d="M13 0C5.8203 0 0 5.59644 0 12.5C0 19.4036 5.8203 25 13 25C20.1797 25 26 19.4036 26 12.5C26 5.59644 20.1797 0 13 0ZM11.0617 8.87138C10.26 8.87138 9.60508 8.21643 9.60508 7.41469C9.60508 6.61295 10.26 5.95801 11.0617 5.95801C11.8634 5.95801 12.5183 6.61295 12.5183 7.41469V8.87138H11.0617ZM7.41487 16.1775C8.21657 16.1775 8.87148 15.5225 8.87148 14.7208V13.2641H7.41487C6.61316 13.2641 5.95825 13.919 5.95825 14.7208C5.95825 15.5225 6.61316 16.1775 7.41487 16.1775ZM11.0617 13.2641C10.26 13.2641 9.60508 13.919 9.60508 14.7208V18.3681C9.60508 19.1699 10.26 19.8248 11.0617 19.8248C11.8634 19.8248 12.5183 19.1699 12.5183 18.3681V14.7208C12.5183 13.919 11.8634 13.2641 11.0617 13.2641ZM12.5187 11.0621C12.5187 10.2603 11.8638 9.60537 11.0621 9.60537H7.41487C6.61316 9.60537 5.95825 10.2603 5.95825 11.0621C5.95825 11.8638 6.61316 12.5187 7.41487 12.5187H11.0621C11.8638 12.5187 12.5187 11.8638 12.5187 11.0621ZM16.9113 11.062C16.9113 10.2603 17.5662 9.60534 18.368 9.60534C19.1697 9.60534 19.8246 10.2603 19.8246 11.062C19.8246 11.8638 19.1697 12.5187 18.368 12.5187H16.9113V11.062ZM14.7211 12.5187C15.5228 12.5187 16.1777 11.8638 16.1777 11.0621V7.41469C16.1777 6.61295 15.5228 5.95801 14.7211 5.95801C13.9194 5.95801 13.2645 6.61295 13.2645 7.41469V11.0621C13.2645 11.8638 13.9194 12.5187 14.7211 12.5187ZM14.7211 16.9115C15.5228 16.9115 16.1777 17.5664 16.1777 18.3682C16.1777 19.1699 15.5228 19.8249 14.7211 19.8249C13.9194 19.8249 13.2645 19.1699 13.2645 18.3682V16.9115H14.7211ZM13.2645 14.7208C13.2645 15.5225 13.9194 16.1775 14.7211 16.1775H18.3683C19.17 16.1775 19.8249 15.5225 19.8249 14.7208C19.8249 13.9191 19.17 13.2641 18.3683 13.2641H14.7211C13.9194 13.2641 13.2645 13.9191 13.2645 14.7208Z" fill="white"/></svg></a><a class="MuiButtonBase-root MuiIconButton-root MuiIconButton-colorInherit MuiIconButton-sizeMedium css-1deacqj" tabindex="0" aria-label="discord" href="https://discord.gg/DQZ2dy3cuc?utm_source=doc" target="_blank"><svg width="26" height="25" viewbox="0 0 26 25" fill="none"><path fill-rule="evenodd" clip-rule="evenodd" d="M13 0C5.8203 0 0 5.59644 0 12.5C0 19.4036 5.8203 25 13 25C20.1797 25 26 19.4036 26 12.5C26 5.59644 20.1797 0 13 0ZM14.8438 7.58301C15.8318 7.75016 16.7936 8.04606 17.7046 8.46316C19.2741 10.7579 20.0539 13.346 19.766 16.3322C18.7055 17.1163 17.5179 17.7118 16.2552 18.0925C15.9708 17.711 15.7194 17.306 15.5037 16.8819C15.9147 16.7283 16.3114 16.5389 16.6892 16.3158C16.5911 16.2493 16.494 16.1751 16.3991 16.0977C15.3018 16.6137 14.1042 16.8813 12.8916 16.8813C11.679 16.8813 10.4813 16.6137 9.384 16.0977C9.29021 16.1697 9.19314 16.2438 9.09389 16.3158C9.471 16.5385 9.86698 16.7275 10.2773 16.8808C10.0612 17.3051 9.80987 17.7104 9.52579 18.0925C8.26415 17.7102 7.07741 17.1145 6.01714 16.3311C5.77174 13.7561 6.26254 11.144 8.07303 8.46534C8.985 8.04818 9.94742 7.75157 10.936 7.58301C11.0711 7.82471 11.1935 8.07336 11.3025 8.32792C12.3548 8.16934 13.425 8.16934 14.4774 8.32792C14.5863 8.07333 14.7086 7.82468 14.8438 7.58301ZM9.33928 13.3634C9.33928 14.1269 9.90425 14.7475 10.5881 14.7475C11.285 14.7475 11.8238 14.1269 11.8358 13.3634C11.8478 12.6 11.2872 11.974 10.5859 11.974C9.88461 11.974 9.33928 12.6 9.33928 13.3634ZM13.9473 13.3634C13.9473 14.1269 14.5101 14.7475 15.195 14.7475C15.892 14.7475 16.4297 14.1269 16.4417 13.3634C16.4537 12.6 15.8974 11.974 15.195 11.974C14.4926 11.974 13.9473 12.6 13.9473 13.3634Z" fill="white"/></svg></a><a class="MuiButtonBase-root MuiIconButton-root MuiIconButton-colorInherit MuiIconButton-sizeMedium css-1deacqj" tabindex="0" aria-label="youtube" href="https://youtube.com/channel/UCuq4puT32DzHKT5rU1IZpIA" target="_blank"><svg width="26" height="25" viewbox="0 0 26 25" fill="none"><path fill-rule="evenodd" clip-rule="evenodd" d="M13 0C5.8203 0 0 5.59644 0 12.5C0 19.4036 5.8203 25 13 25C20.1797 25 26 19.4036 26 12.5C26 5.59644 20.1797 0 13 0ZM18.4175 8.2028C19.0142 8.36023 19.4841 8.82409 19.6436 9.41316C19.9333 10.4808 19.9333 12.7084 19.9333 12.7084C19.9333 12.7084 19.9333 14.9359 19.6436 16.0036C19.4841 16.5926 19.0142 17.0565 18.4175 17.214C17.3363 17.5 13 17.5 13 17.5C13 17.5 8.66377 17.5 7.5824 17.214C6.98574 17.0565 6.51585 16.5926 6.35638 16.0036C6.06668 14.9359 6.06668 12.7084 6.06668 12.7084C6.06668 12.7084 6.06668 10.4808 6.35638 9.41316C6.51585 8.82409 6.98574 8.36023 7.5824 8.2028C8.66377 7.91669 13 7.91669 13 7.91669C13 7.91669 17.3363 7.91669 18.4175 8.2028Z" fill="white"/><path d="M11.7001 14.9999V10.8333L15.1667 12.9167L11.7001 14.9999Z" fill="white"/></svg></a></div></div></div><div class="css-1207o6v"><div class="css-8mv08g"><a class="MuiButtonBase-root MuiIconButton-root MuiIconButton-colorInherit MuiIconButton-sizeMedium css-1deacqj" tabindex="0" aria-label="github" href="https://github.com/pingcap" target="_blank"><svg width="26" height="25" viewbox="0 0 26 25" fill="none"><path d="M13.0234 0.09375C5.85795 0.09375 0.0474854 5.77495 0.0474854 12.7836C0.0474854 18.3904 3.76549 23.1472 8.92122 24.8252C9.56972 24.9427 9.8078 24.5499 9.8078 24.2147C9.8078 23.9121 9.79577 22.9125 9.79018 21.8521C6.18026 22.6198 5.41853 20.3548 5.41853 20.3548C4.82826 18.888 3.97778 18.498 3.97778 18.498C2.80048 17.7104 4.06653 17.7266 4.06653 17.7266C5.36954 17.8159 6.05563 19.0343 6.05563 19.0343C7.21296 20.9743 9.09119 20.4135 9.83165 20.0892C9.94811 19.2692 10.2844 18.709 10.6555 18.3923C7.77335 18.0714 4.7436 16.9833 4.7436 12.1208C4.7436 10.7354 5.25049 9.60332 6.08056 8.71463C5.94583 8.3948 5.50168 7.10431 6.20626 5.35635C6.20626 5.35635 7.2959 5.01529 9.77557 6.65713C10.8106 6.37596 11.9207 6.23495 13.0234 6.23012C14.1262 6.23495 15.2371 6.37596 16.2741 6.65713C18.7507 5.01529 19.8389 5.35635 19.8389 5.35635C20.5452 7.10431 20.1008 8.3948 19.9661 8.71463C20.7981 9.60332 21.3015 10.7354 21.3015 12.1208C21.3015 16.9949 18.266 18.0681 15.3765 18.3822C15.8419 18.776 16.2567 19.5483 16.2567 20.7323C16.2567 22.43 16.2416 23.7966 16.2416 24.2147C16.2416 24.5524 16.4752 24.9481 17.1329 24.8235C22.2859 23.1436 25.9991 18.3885 25.9991 12.7836C25.9991 5.77495 20.1895 0.09375 13.0234 0.09375Z" fill="white"/><path d="M4.96214 18.3138C4.93356 18.377 4.83214 18.3957 4.73974 18.3524C4.64562 18.311 4.59276 18.2251 4.62328 18.1618C4.65121 18.0969 4.75285 18.079 4.84675 18.1221C4.94108 18.1637 4.9948 18.2505 4.96214 18.3138Z" fill="white"/><path d="M5.48764 18.887C5.42576 18.9431 5.30478 18.9171 5.2227 18.8284C5.13782 18.7399 5.12192 18.6216 5.18467 18.5647C5.24848 18.5086 5.36581 18.5348 5.4509 18.6233C5.53577 18.7128 5.55232 18.8303 5.48764 18.887Z" fill="white"/><path d="M5.99931 19.6179C5.9198 19.6719 5.7898 19.6213 5.70944 19.5084C5.62994 19.3956 5.62994 19.2603 5.71116 19.206C5.79174 19.1518 5.9198 19.2006 6.00124 19.3126C6.08053 19.4271 6.08053 19.5626 5.99931 19.6179Z" fill="white"/><path d="M6.70033 20.3239C6.6292 20.4006 6.47772 20.38 6.36684 20.2753C6.25339 20.173 6.2218 20.0278 6.29314 19.9511C6.36512 19.8742 6.51747 19.8958 6.6292 19.9996C6.7418 20.1017 6.77618 20.248 6.70033 20.3239Z" fill="white"/><path d="M7.66729 20.7342C7.63592 20.8336 7.49002 20.8788 7.34304 20.8365C7.19628 20.793 7.10024 20.6766 7.12989 20.5762C7.1604 20.4761 7.30695 20.4291 7.455 20.4743C7.60154 20.5175 7.69781 20.6331 7.66729 20.7342Z" fill="white"/><path d="M8.72911 20.8102C8.73277 20.9149 8.60814 21.0017 8.45386 21.0033C8.29872 21.0069 8.17323 20.9222 8.17151 20.8192C8.17151 20.7135 8.29334 20.6276 8.44848 20.6251C8.60277 20.6221 8.72911 20.7062 8.72911 20.8102Z" fill="white"/><path d="M9.71731 20.6456C9.73578 20.7477 9.62856 20.8526 9.47535 20.8803C9.32473 20.9074 9.18527 20.8444 9.16615 20.7431C9.14745 20.6384 9.25661 20.5336 9.40702 20.5065C9.56045 20.4804 9.69775 20.5418 9.71731 20.6456Z" fill="white"/></svg></a><a class="MuiButtonBase-root MuiIconButton-root MuiIconButton-colorInherit MuiIconButton-sizeMedium css-1deacqj" tabindex="0" aria-label="twitter" href="https://twitter.com/PingCAP" target="_blank"><svg width="26" height="25" viewbox="0 0 26 25" fill="none"><path fill-rule="evenodd" clip-rule="evenodd" d="M13 0C5.8203 0 0 5.59644 0 12.5C0 19.4036 5.8203 25 13 25C20.1797 25 26 19.4036 26 12.5C26 5.59644 20.1797 0 13 0ZM19.0945 5.95801L14.0396 11.8296H14.0393L19.5371 19.8247H15.4938L11.7915 14.4408L7.15642 19.8247H5.9585L11.2597 13.6674L5.9585 5.95801H10.0018L13.5075 11.0562L17.8967 5.95801H19.0945ZM11.8618 12.9677L12.3989 13.7353V13.7356L16.0573 18.9645H17.8973L13.4141 12.5566L12.8769 11.7889L9.428 6.85912H7.58805L11.8618 12.9677Z" fill="white"/></svg></a><a class="MuiButtonBase-root MuiIconButton-root MuiIconButton-colorInherit MuiIconButton-sizeMedium css-1deacqj" tabindex="0" aria-label="linkedin" href="https://linkedin.com/company/pingcap" target="_blank"><svg width="26" height="25" viewbox="0 0 26 25" fill="none"><path fill-rule="evenodd" clip-rule="evenodd" d="M13 0C5.8203 0 0 5.59644 0 12.5C0 19.4036 5.8203 25 13 25C20.1797 25 26 19.4036 26 12.5C26 5.59644 20.1797 0 13 0ZM9.27262 7.72008C9.2535 6.88555 8.63286 6.24992 7.62502 6.24992C6.61718 6.24992 5.95829 6.88555 5.95829 7.72008C5.95829 8.53732 6.59771 9.19125 7.58678 9.19125H7.6056C8.63286 9.19125 9.27262 8.53732 9.27262 7.72008ZM9.07867 10.353H6.13259V18.8643H9.07867V10.353ZM16.3113 10.1531C18.25 10.1531 19.7034 11.3699 19.7034 13.9842L19.7033 18.8643H16.7573V14.3107C16.7573 13.167 16.331 12.3865 15.2645 12.3865C14.4506 12.3865 13.9658 12.9127 13.7528 13.4208C13.6749 13.603 13.6558 13.8567 13.6558 14.1111V18.8645H10.7094C10.7094 18.8645 10.7482 11.1519 10.7094 10.3532H13.6558V11.5588C14.0468 10.9792 14.7471 10.1531 16.3113 10.1531Z" fill="white"/></svg></a><a class="MuiButtonBase-root MuiIconButton-root MuiIconButton-colorInherit MuiIconButton-sizeMedium css-1deacqj" tabindex="0" aria-label="facebook" href="https://facebook.com/pingcap2015" target="_blank"><svg width="26" height="25" viewbox="0 0 26 25" fill="none"><path fill-rule="evenodd" clip-rule="evenodd" d="M13 0C5.8203 0 0 5.59644 0 12.5C0 19.4036 5.8203 25 13 25C20.1797 25 26 19.4036 26 12.5C26 5.59644 20.1797 0 13 0ZM14.1384 13.049V19.8496H11.212V13.0493H9.75004V10.7057H11.212V9.29865C11.212 7.38679 12.0376 6.24992 14.383 6.24992H16.3357V8.59373H15.1151C14.2021 8.59373 14.1417 8.92124 14.1417 9.53248L14.1384 10.7054H16.3495L16.0908 13.049H14.1384Z" fill="white"/></svg></a><a class="MuiButtonBase-root MuiIconButton-root MuiIconButton-colorInherit MuiIconButton-sizeMedium css-1deacqj" tabindex="0" aria-label="slack" href="https://slack.tidb.io/invite?team=tidb-community&amp;channel=everyone&amp;ref=pingcap-docs" target="_blank"><svg width="26" height="25" viewbox="0 0 26 25" fill="none"><path fill-rule="evenodd" clip-rule="evenodd" d="M13 0C5.8203 0 0 5.59644 0 12.5C0 19.4036 5.8203 25 13 25C20.1797 25 26 19.4036 26 12.5C26 5.59644 20.1797 0 13 0ZM11.0617 8.87138C10.26 8.87138 9.60508 8.21643 9.60508 7.41469C9.60508 6.61295 10.26 5.95801 11.0617 5.95801C11.8634 5.95801 12.5183 6.61295 12.5183 7.41469V8.87138H11.0617ZM7.41487 16.1775C8.21657 16.1775 8.87148 15.5225 8.87148 14.7208V13.2641H7.41487C6.61316 13.2641 5.95825 13.919 5.95825 14.7208C5.95825 15.5225 6.61316 16.1775 7.41487 16.1775ZM11.0617 13.2641C10.26 13.2641 9.60508 13.919 9.60508 14.7208V18.3681C9.60508 19.1699 10.26 19.8248 11.0617 19.8248C11.8634 19.8248 12.5183 19.1699 12.5183 18.3681V14.7208C12.5183 13.919 11.8634 13.2641 11.0617 13.2641ZM12.5187 11.0621C12.5187 10.2603 11.8638 9.60537 11.0621 9.60537H7.41487C6.61316 9.60537 5.95825 10.2603 5.95825 11.0621C5.95825 11.8638 6.61316 12.5187 7.41487 12.5187H11.0621C11.8638 12.5187 12.5187 11.8638 12.5187 11.0621ZM16.9113 11.062C16.9113 10.2603 17.5662 9.60534 18.368 9.60534C19.1697 9.60534 19.8246 10.2603 19.8246 11.062C19.8246 11.8638 19.1697 12.5187 18.368 12.5187H16.9113V11.062ZM14.7211 12.5187C15.5228 12.5187 16.1777 11.8638 16.1777 11.0621V7.41469C16.1777 6.61295 15.5228 5.95801 14.7211 5.95801C13.9194 5.95801 13.2645 6.61295 13.2645 7.41469V11.0621C13.2645 11.8638 13.9194 12.5187 14.7211 12.5187ZM14.7211 16.9115C15.5228 16.9115 16.1777 17.5664 16.1777 18.3682C16.1777 19.1699 15.5228 19.8249 14.7211 19.8249C13.9194 19.8249 13.2645 19.1699 13.2645 18.3682V16.9115H14.7211ZM13.2645 14.7208C13.2645 15.5225 13.9194 16.1775 14.7211 16.1775H18.3683C19.17 16.1775 19.8249 15.5225 19.8249 14.7208C19.8249 13.9191 19.17 13.2641 18.3683 13.2641H14.7211C13.9194 13.2641 13.2645 13.9191 13.2645 14.7208Z" fill="white"/></svg></a><a class="MuiButtonBase-root MuiIconButton-root MuiIconButton-colorInherit MuiIconButton-sizeMedium css-1deacqj" tabindex="0" aria-label="discord" href="https://discord.gg/DQZ2dy3cuc?utm_source=doc" target="_blank"><svg width="26" height="25" viewbox="0 0 26 25" fill="none"><path fill-rule="evenodd" clip-rule="evenodd" d="M13 0C5.8203 0 0 5.59644 0 12.5C0 19.4036 5.8203 25 13 25C20.1797 25 26 19.4036 26 12.5C26 5.59644 20.1797 0 13 0ZM14.8438 7.58301C15.8318 7.75016 16.7936 8.04606 17.7046 8.46316C19.2741 10.7579 20.0539 13.346 19.766 16.3322C18.7055 17.1163 17.5179 17.7118 16.2552 18.0925C15.9708 17.711 15.7194 17.306 15.5037 16.8819C15.9147 16.7283 16.3114 16.5389 16.6892 16.3158C16.5911 16.2493 16.494 16.1751 16.3991 16.0977C15.3018 16.6137 14.1042 16.8813 12.8916 16.8813C11.679 16.8813 10.4813 16.6137 9.384 16.0977C9.29021 16.1697 9.19314 16.2438 9.09389 16.3158C9.471 16.5385 9.86698 16.7275 10.2773 16.8808C10.0612 17.3051 9.80987 17.7104 9.52579 18.0925C8.26415 17.7102 7.07741 17.1145 6.01714 16.3311C5.77174 13.7561 6.26254 11.144 8.07303 8.46534C8.985 8.04818 9.94742 7.75157 10.936 7.58301C11.0711 7.82471 11.1935 8.07336 11.3025 8.32792C12.3548 8.16934 13.425 8.16934 14.4774 8.32792C14.5863 8.07333 14.7086 7.82468 14.8438 7.58301ZM9.33928 13.3634C9.33928 14.1269 9.90425 14.7475 10.5881 14.7475C11.285 14.7475 11.8238 14.1269 11.8358 13.3634C11.8478 12.6 11.2872 11.974 10.5859 11.974C9.88461 11.974 9.33928 12.6 9.33928 13.3634ZM13.9473 13.3634C13.9473 14.1269 14.5101 14.7475 15.195 14.7475C15.892 14.7475 16.4297 14.1269 16.4417 13.3634C16.4537 12.6 15.8974 11.974 15.195 11.974C14.4926 11.974 13.9473 12.6 13.9473 13.3634Z" fill="white"/></svg></a><a class="MuiButtonBase-root MuiIconButton-root MuiIconButton-colorInherit MuiIconButton-sizeMedium css-1deacqj" tabindex="0" aria-label="youtube" href="https://youtube.com/channel/UCuq4puT32DzHKT5rU1IZpIA" target="_blank"><svg width="26" height="25" viewbox="0 0 26 25" fill="none"><path fill-rule="evenodd" clip-rule="evenodd" d="M13 0C5.8203 0 0 5.59644 0 12.5C0 19.4036 5.8203 25 13 25C20.1797 25 26 19.4036 26 12.5C26 5.59644 20.1797 0 13 0ZM18.4175 8.2028C19.0142 8.36023 19.4841 8.82409 19.6436 9.41316C19.9333 10.4808 19.9333 12.7084 19.9333 12.7084C19.9333 12.7084 19.9333 14.9359 19.6436 16.0036C19.4841 16.5926 19.0142 17.0565 18.4175 17.214C17.3363 17.5 13 17.5 13 17.5C13 17.5 8.66377 17.5 7.5824 17.214C6.98574 17.0565 6.51585 16.5926 6.35638 16.0036C6.06668 14.9359 6.06668 12.7084 6.06668 12.7084C6.06668 12.7084 6.06668 10.4808 6.35638 9.41316C6.51585 8.82409 6.98574 8.36023 7.5824 8.2028C8.66377 7.91669 13 7.91669 13 7.91669C13 7.91669 17.3363 7.91669 18.4175 8.2028Z" fill="white"/><path d="M11.7001 14.9999V10.8333L15.1667 12.9167L11.7001 14.9999Z" fill="white"/></svg></a></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium css-1pmugoj" focusable="false" aria-hidden="true" viewbox="0 0 98 26" fill="none"><path d="M39.8024 6.68462H38.2456V8.23794H39.8024V6.68462Z" fill="white"/><path d="M39.8024 10.1767H38.2456V19.6531H39.8024V10.1767Z" fill="white"/><path d="M45.8612 9.58899C45.2783 9.57411 44.6988 9.67987 44.1589 9.89959C43.6191 10.1193 43.1308 10.4482 42.7247 10.8656C42.3149 11.2856 41.9939 11.7834 41.7807 12.3295C41.5675 12.8756 41.4664 13.4589 41.4835 14.0448V19.6417H42.9886V13.9169C42.9819 13.5402 43.0543 13.1663 43.2012 12.8192C43.3482 12.4722 43.5663 12.1597 43.8416 11.9018C44.1029 11.6309 44.4167 11.4157 44.7638 11.2694C45.111 11.1231 45.4843 11.0487 45.8612 11.0507C46.2338 11.0465 46.6033 11.1191 46.9465 11.2639C47.2897 11.4087 47.5993 11.6226 47.8559 11.8923C48.1311 12.1509 48.35 12.4633 48.4991 12.8099C48.6481 13.1566 48.7241 13.5302 48.7222 13.9074V19.6417H50.2274V14.0448C50.2442 13.4571 50.1409 12.8722 49.9239 12.3257C49.7069 11.7791 49.3807 11.2823 48.9651 10.8656C48.565 10.4493 48.0824 10.1208 47.5479 9.90096C47.0135 9.68116 46.439 9.57491 45.8612 9.58899Z" fill="white"/><path d="M61.7596 18.7143V14.6459C61.7756 13.9638 61.6477 13.2859 61.3841 12.6564C61.1205 12.0268 60.7272 11.4596 60.2296 10.9916C59.7774 10.5253 59.2376 10.1525 58.6411 9.89442C58.0445 9.63633 57.4028 9.49802 56.7526 9.48739C56.1024 9.47676 55.4565 9.59401 54.8518 9.83245C54.247 10.0709 53.6953 10.4259 53.228 10.8771C53.1687 10.9343 53.1114 10.9935 53.054 11.0526C52.1288 12.0089 51.6213 13.2921 51.6426 14.6211C51.6367 15.3083 51.7691 15.9897 52.0319 16.6249C52.2947 17.2601 52.6826 17.8363 53.1726 18.3193C53.6426 18.8105 54.2127 19.1955 54.8445 19.4484C55.4763 19.7012 56.155 19.8159 56.835 19.7848C57.4825 19.769 58.1204 19.6247 58.7114 19.3603C59.3025 19.0959 59.8348 18.7167 60.2774 18.2448V18.8917M60.2774 18.8784C60.2792 19.3029 60.1895 19.7229 60.0143 20.1098C59.839 20.4967 59.5825 20.8414 59.2619 21.1206C58.947 21.4286 58.5743 21.6715 58.165 21.8353C57.7557 21.999 57.318 22.0804 56.877 22.0747C56.1126 22.0789 55.368 21.8321 54.758 21.3725C54.2743 21.0384 53.885 20.5856 53.6277 20.0577L52.4363 20.7466C52.735 21.3328 53.1594 21.8461 53.6794 22.2503C54.5478 22.9254 55.6137 23.2986 56.7145 23.3132H56.9402C58.1311 23.32 59.2863 22.9079 60.2029 22.1491C60.6874 21.7899 61.0799 21.3213 61.3481 20.7816C61.6163 20.242 61.7528 19.6467 61.7462 19.0444V18.7009M60.2488 14.7337C60.2385 15.6811 59.86 16.5876 59.1931 17.2621C58.8825 17.6017 58.5031 17.8716 58.0801 18.0539C57.6571 18.2362 57.2001 18.3266 56.7393 18.3193C56.267 18.3286 55.7979 18.24 55.3617 18.059C54.9255 17.878 54.5317 17.6086 54.2053 17.2678C53.5237 16.5954 53.1319 15.6842 53.1134 14.728C53.0948 13.7719 53.4509 12.8462 54.1059 12.148C54.4082 11.7918 54.7822 11.5029 55.2036 11.3001C55.625 11.0973 56.0843 10.985 56.5519 10.9706H56.7432C57.2041 10.9639 57.6609 11.0579 58.0815 11.2462C58.5021 11.4344 58.8763 11.7123 59.1778 12.0602C59.5361 12.4039 59.8168 12.8201 60.0008 13.2808C60.1849 13.7416 60.2681 14.2363 60.2449 14.7317L60.2488 14.7337Z" fill="white"/><path d="M73.3512 16.0866L73.3149 16.1362C72.8848 16.8154 72.2936 17.3784 71.5936 17.7754C70.8841 18.2096 70.0697 18.4431 69.2374 18.4509C67.87 18.4509 66.6651 17.9014 65.6726 16.8251C64.7087 15.7657 64.1956 14.3738 64.242 12.9437C64.2483 11.5757 64.773 10.2606 65.7108 9.26268C66.1382 8.77658 66.6651 8.38758 67.256 8.12193C67.8469 7.85627 68.488 7.72014 69.1361 7.72272C70.9434 7.70936 72.2974 8.44785 73.29 9.98782L73.3149 10.0393H73.3397L74.5063 9.31229C74.0185 8.49472 73.3596 7.79176 72.5747 7.25138C71.5806 6.59524 70.416 6.24307 69.224 6.23809C68.3844 6.21999 67.5505 6.38084 66.7781 6.70991C66.0057 7.03898 65.3126 7.52869 64.745 8.14635C63.5 9.42679 62.8631 11.0679 62.8631 13.0067C62.8348 14.8078 63.4994 16.5513 64.7201 17.8785C65.9499 19.2142 67.4416 19.8802 69.1495 19.8802H69.2107C71.4578 19.8306 73.3149 18.7353 74.4929 16.8003L73.3512 16.0866Z" fill="white"/><path d="M82.1104 6.43273H80.5211L74.5924 19.6417H76.4877L78.3179 15.2527L78.9586 13.8883L81.3435 8.29901L83.6786 13.8826H80.3298L79.7159 15.247H84.2198L86.0635 19.636H87.7331L82.1104 6.43273Z" fill="white"/><path d="M96.3947 7.63303C95.4904 6.83506 94.3158 6.41006 93.1091 6.44418H88.8098V19.6398H90.3646V14.4703V13.0811V7.87347H93.1435C93.8829 7.85905 94.6034 8.10726 95.1765 8.5738C95.4521 8.77883 95.6784 9.04265 95.8389 9.34604C95.9993 9.64943 96.0899 9.98473 96.104 10.3275C96.1399 10.7052 96.0833 11.0859 95.9391 11.437C95.7948 11.788 95.5672 12.0988 95.2759 12.3426C94.7187 12.8445 93.9895 13.1136 93.2391 13.0945H91.6135V14.4837H93.4839C94.5638 14.4995 95.6076 14.0958 96.3947 13.3578C96.7877 13.0165 97.103 12.5952 97.3194 12.1222C97.5358 11.6492 97.6483 11.1355 97.6493 10.6156C97.6813 10.056 97.5849 9.49648 97.3675 8.97963C97.1501 8.46277 96.8174 8.00222 96.3947 7.63303Z" fill="white"/><path d="M35.4611 7.63303C34.5559 6.8351 33.3808 6.41014 32.1735 6.44418H27.8819V19.6398H29.4386V14.4703V13.0811V7.87347H32.2232C32.9628 7.85788 33.6838 8.10622 34.2562 8.5738C34.5326 8.77806 34.7595 9.04172 34.9201 9.34527C35.0806 9.64882 35.1707 9.9845 35.1837 10.3275C35.2205 10.7053 35.1643 11.0863 35.02 11.4374C34.8756 11.7886 34.6476 12.0993 34.3556 12.3426C33.7975 12.848 33.0646 13.1176 32.3112 13.0945H30.6932V14.4837H32.5617C33.6423 14.4998 34.6868 14.096 35.4744 13.3578C35.8649 13.017 36.1782 12.5973 36.3939 12.1265C36.6095 11.6558 36.7224 11.1447 36.7252 10.6271C36.76 10.0646 36.664 9.50163 36.4447 8.98225C36.2254 8.46287 35.8888 8.00111 35.4611 7.63303Z" fill="white"/><path d="M45.9376 9.60044C45.3565 9.58541 44.7786 9.69114 44.2406 9.91092C43.7026 10.1307 43.2164 10.4597 42.8126 10.8771C42.403 11.2947 42.0819 11.7905 41.8687 12.3348C41.6554 12.879 41.5543 13.4606 41.5714 14.0448V19.6169H43.0766V13.9074C43.0699 13.5307 43.1423 13.1568 43.2892 12.8097C43.4361 12.4626 43.6542 12.1501 43.9295 11.8923C44.1906 11.621 44.5043 11.4056 44.8515 11.2593C45.1987 11.113 45.5722 11.0387 45.9491 11.0412C46.3208 11.0379 46.6891 11.1119 47.0305 11.2584C47.372 11.405 47.6791 11.6208 47.9324 11.8923C48.2076 12.1508 48.4264 12.4632 48.5752 12.8099C48.7239 13.1566 48.7994 13.5302 48.7968 13.9074V19.6169H50.3038V14.0448C50.3207 13.4605 50.2193 12.8788 50.0057 12.3345C49.7922 11.7903 49.4707 11.2946 49.0607 10.8771C48.6549 10.463 48.1685 10.1361 47.6315 9.9166C47.0944 9.69706 46.518 9.58946 45.9376 9.60044Z" fill="white"/><path d="M20.3582 4.0798L6.31671 0.0610093C6.1291 0.00562615 5.9324 -0.0123436 5.73783 0.00812623C5.54326 0.028596 5.35463 0.0871044 5.18272 0.180311C5.01082 0.273517 4.85899 0.399596 4.73592 0.551349C4.61284 0.703102 4.52093 0.877557 4.46543 1.06475C4.42506 1.19845 4.40445 1.3373 4.40423 1.47694V3.28978L2.65622 2.79172C2.43668 2.72681 2.20475 2.71529 1.97983 2.75811C1.75491 2.80094 1.54354 2.89687 1.36338 3.03789C1.17948 3.17495 1.03015 3.3529 0.927234 3.55762C0.824319 3.76233 0.770656 3.98817 0.770508 4.21719L0.770508 24.5249C0.772032 24.7498 0.824418 24.9714 0.923761 25.1733C1.0231 25.3752 1.16684 25.5521 1.34425 25.6908C1.60756 25.8896 1.92825 25.998 2.25842 25.9999C2.37094 25.9985 2.4828 25.9824 2.59119 25.9522L13.63 23.3227C13.9565 23.2518 14.2487 23.0711 14.4576 22.8109C14.6665 22.5507 14.7795 22.2268 14.7775 21.8934V16.264L20.3008 14.9282C20.6296 14.8562 20.9233 14.6731 21.1324 14.4099C21.3414 14.1467 21.453 13.8195 21.4483 13.4837V5.49572C21.4483 5.17286 21.3414 4.85904 21.1443 4.603C20.9472 4.34696 20.6708 4.16304 20.3582 4.0798ZM6.13503 16.8651C6.08029 16.8782 6.02258 16.8693 5.97438 16.8403C5.95046 16.8258 5.92969 16.8067 5.91327 16.7841C5.89685 16.7615 5.88511 16.7358 5.87875 16.7086C5.87684 16.6909 5.87684 16.673 5.87875 16.6552L5.85963 5.20567L13.0831 7.25132C13.154 7.2719 13.2163 7.31479 13.2607 7.37359C13.3052 7.4324 13.3294 7.50397 13.3298 7.57763V15.1343L6.13503 16.8651ZM5.86154 18.3574H5.88831C6.00362 18.3599 6.11875 18.3471 6.23065 18.3192L13.3298 16.6018V21.3724L13.3183 21.6548C13.3178 21.7314 13.2926 21.8058 13.2464 21.8669C13.2003 21.9281 13.1356 21.9728 13.062 21.9945L2.49174 24.4962C2.46455 24.5029 2.43629 24.5039 2.40867 24.4993C2.38105 24.4948 2.35466 24.4846 2.33109 24.4695C2.30718 24.455 2.28641 24.4359 2.26999 24.4133C2.25357 24.3907 2.24183 24.365 2.23547 24.3379C2.23356 24.3207 2.23356 24.3034 2.23547 24.2863V4.45C2.2344 4.39762 2.25373 4.34687 2.2894 4.30843C2.32507 4.26999 2.3743 4.24686 2.42672 4.24391C2.45024 4.24466 2.47348 4.24917 2.49557 4.25727L4.40805 4.79539V16.8842C4.40629 17.0767 4.44253 17.2676 4.51472 17.4461C4.5869 17.6245 4.69362 17.7871 4.82877 17.9244C4.96391 18.0618 5.12485 18.1712 5.30238 18.2464C5.47991 18.3217 5.67057 18.3614 5.86345 18.3631L5.86154 18.3574ZM13.7027 5.92699L5.86154 3.69433L5.84815 1.71738C5.84814 1.66034 5.87059 1.60557 5.91065 1.56489C5.95072 1.5242 6.00519 1.50084 6.06235 1.49984H6.12546L19.7232 5.37932C19.7972 5.40126 19.8617 5.44709 19.9067 5.50961C19.9517 5.57213 19.9746 5.64779 19.9718 5.72472L19.9833 13.2738C19.9879 13.3477 19.9655 13.4208 19.9201 13.4795C19.8747 13.5381 19.8095 13.5782 19.7366 13.5925L14.7699 14.787V7.35818C14.7696 7.03703 14.6652 6.72459 14.4721 6.46763C14.2791 6.21067 14.0078 6.023 13.6989 5.93272L13.7027 5.92699Z" fill="white"/></svg></div><div class="css-15rgo24"><div class="MuiTypography-root MuiTypography-body2 css-6dn05s">© 2024 PingCAP. All Rights Reserved.</div><div class="MuiTypography-root MuiTypography-body2 css-1v0cmhv">/</div><a class="MuiTypography-root MuiTypography-body2 MuiLink-root MuiLink-underlineAlways css-11vvcg5" href="https://cn.pingcap.com/privacy-policy" target="_blank">隐私政策</a><div class="MuiTypography-root MuiTypography-body2 css-1v0cmhv">/</div><a class="MuiTypography-root MuiTypography-body2 MuiLink-root MuiLink-underlineAlways css-11vvcg5" href="https://cn.pingcap.com/law/" target="_blank">安全合规</a></div></div></footer></div><div id="gatsby-announcer" style="top:0;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0, 0, 0, 0);white-space:nowrap;border:0" aria-live="assertive" aria-atomic="true"/></div></body>