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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-hg1lfe">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-z7v9yr" 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-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">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-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">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-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">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-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">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-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">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-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">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-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">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-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">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-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">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-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">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-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">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-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">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-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">TiDB 工具</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-13" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">参考指南</div></div></div></div></div></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-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">常见问题解答 (FAQ)</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="true" id="left-nav-treeview-0-15" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">版本发布历史</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 style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/release-notes"><li class="MuiTreeItem-root css-14t19hb" role="treeitem" id="left-nav-treeview-0-15-0" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">发布版本汇总</div></div></div></div></div></li></a><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/release-timeline"><li class="MuiTreeItem-root css-14t19hb" role="treeitem" id="left-nav-treeview-0-15-1" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">版本发布时间线</div></div></div></div></div></li></a><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/versioning"><li class="MuiTreeItem-root css-14t19hb" role="treeitem" id="left-nav-treeview-0-15-2" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">TiDB 版本规则</div></div></div></div></div></li></a><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/binary-package"><li class="MuiTreeItem-root css-14t19hb" role="treeitem" id="left-nav-treeview-0-15-3" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">TiDB 离线包</div></div></div></div></div></li></a><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15-4" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">v8.1</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15-5" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">v8.0</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15-6" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">v7.6</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15-7" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">v7.5</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15-8" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">v7.4</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15-9" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">v7.3</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15-10" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">v7.2</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15-11" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">v7.1</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15-12" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">v7.0</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15-13" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">v6.6</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15-14" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">v6.5</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="true" id="left-nav-treeview-0-15-15" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">v6.4</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/release-6.4.0"><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-selected="true" id="left-nav-treeview-0-15-15-0" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">6.4.0-DMR</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-0-15-16" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">v6.3</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15-17" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">v6.2</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15-18" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">v6.1</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15-19" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">v6.0</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15-20" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">v5.4</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15-21" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">v5.3</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15-22" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">v5.2</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15-23" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">v5.1</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15-24" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">v5.0</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15-25" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">v4.0</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15-26" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">v3.1</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15-27" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">v3.0</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15-28" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">v2.1</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15-29" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">v2.0</div></div></div></div></div></li><li class="MuiTreeItem-root css-14t19hb" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15-30" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">v1.0</div></div></div></div></div></li></div></div></ul></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-zfdk9c 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-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1rc6ywa">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-640-release-notes" style="position:relative">TiDB 6.4.0 Release Notes<a href="#tidb-640-release-notes" aria-label="tidb 640 release notes 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>发版日期：2022 年 11 月 17 日</p><p>TiDB 版本：6.4.0-DMR</p><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-o4nulc">注意</div><p>TiDB 6.4.0-DMR 的用户文档已<a href="https://docs-archive.pingcap.com/zh/tidb/v6.4" target="_blank" referrerpolicy="no-referrer-when-downgrade">归档</a>。如无特殊需求，建议使用 TiDB 数据库的<a href="https://docs.pingcap.com/zh/tidb/stable" target="_blank" referrerpolicy="no-referrer-when-downgrade">最新 LTS 版本</a>。</p></div></div></div><p>试用链接：<a href="https://docs.pingcap.com/zh/tidb/v6.4/quick-start-with-tidb" target="_blank" referrerpolicy="no-referrer-when-downgrade">快速体验</a> | <a href="https://cn.pingcap.com/product-community/?version=v6.4.0-DMR#version-list" target="_blank" referrerpolicy="no-referrer-when-downgrade">下载离线包</a></p><p>在 6.4.0-DMR 版本中，你可以获得以下关键特性：</p><ul><li>支持通过 <a href="/zh/tidb/stable/sql-statement-flashback-cluster"><code>FLASHBACK CLUSTER TO TIMESTAMP</code></a> 命令将集群快速回退到特定的时间点 (实验特性）。</li><li>支持对 TiDB 实例的<a href="/zh/tidb/stable/configure-memory-usage">全局内存使用进行追踪</a>（实验特性）。</li><li>TiDB 分区表<a href="/zh/tidb/stable/partitioned-table#tidb-对-linear-hash-分区的处理">兼容 LINEAR HASH 分区语法</a>。</li><li>支持高性能、全局单调递增的 <a href="/zh/tidb/stable/auto-increment#mysql-兼容模式"><code>AUTO_INCREMENT</code></a> 列属性（实验特性）。</li><li>支持对 <a href="/zh/tidb/stable/data-type-json">JSON 类型</a>中的 Array 数据做范围选择。</li><li>实现磁盘故障、I/O 无响应等极端情况下的故障恢复加速。</li><li>新增<a href="/zh/tidb/stable/join-reorder#join-reorder-动态规划算法实例">动态规划算法</a>来决定表的连接顺序。</li><li>引入<a href="/zh/tidb/stable/optimizer-hints#no_decorrelate">新的优化器提示 <code>NO_DECORRELATE</code></a> 来控制关联优化的解除。</li><li><a href="/zh/tidb/stable/dashboard-diagnostics-access">集群诊断功能</a> GA。</li><li><a href="/zh/tidb/stable/encryption-at-rest#tiflash">TiFlash 静态加密</a>支持国密算法 SM4。</li><li>支持通过 SQL 语句立即对指定分区的 TiFlash 副本进行<a href="/zh/tidb/stable/sql-statement-alter-table-compact">物理数据整理 (Compaction)</a>。</li><li>支持<a href="https://docs.pingcap.com/zh/tidb-in-kubernetes/v1.4/backup-to-aws-s3-by-snapshot" target="_blank" referrerpolicy="no-referrer-when-downgrade">基于 AWS EBS snapshot 的集群备份和恢复</a>。</li><li>支持在分库分表合并迁移场景中<a href="/zh/tidb/stable/dm-table-routing#提取分库分表数据源信息写入合表">标记下游表中的数据来自上游哪个分库、分表和数据源</a>。</li></ul><h2 id="新功能" style="position:relative">新功能<a href="#%E6%96%B0%E5%8A%9F%E8%83%BD" aria-label="新功能 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="sql" style="position:relative">SQL<a href="#sql" aria-label="sql 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><p>支持通过 SQL 语句立即对指定分区的 TiFlash 副本进行物理数据整理 (Compaction) <a href="https://github.com/pingcap/tiflash/issues/5315" target="_blank" referrerpolicy="no-referrer-when-downgrade">#5315</a> @<a href="https://github.com/hehechen" target="_blank" referrerpolicy="no-referrer-when-downgrade">hehechen</a></p><p> TiDB v6.2.0 发布了针对全表的 TiFlash 副本立即进行<a href="/zh/tidb/stable/sql-statement-alter-table-compact#alter-table--compact">物理数据整理 (Compaction)</a> 的功能，支持用户自行选择合适的时机，手动执行 SQL 语句立即对 TiFlash 中的物理数据进行整理，从而减少存储空间占用，并提升查询性能。v6.4.0 细化了 TiFlash 副本数据整理的粒度，支持对表中指定分区的 TiFlash 副本立即进行数据整理。</p><p> 通过 SQL 语句 <code>ALTER TABLE table_name COMPACT [PARTITION PartitionNameList] [engine_type REPLICA]</code>，你可以立即对指定分区的 TiFlash 副本进行数据整理。</p><p> 更多信息，请参考<a href="/zh/tidb/stable/sql-statement-alter-table-compact#对分区表中指定分区的-tiflash-副本进行数据整理">用户文档</a>。</p></li><li><p>支持通过 <code>FLASHBACK CLUSTER TO TIMESTAMP</code> 命令将集群快速回退到特定的时间点（实验特性）<a href="https://github.com/pingcap/tidb/issues/37197" target="_blank" referrerpolicy="no-referrer-when-downgrade">#37197</a> <a href="https://github.com/tikv/tikv/issues/13303" target="_blank" referrerpolicy="no-referrer-when-downgrade">#13303</a> @<a href="https://github.com/Defined2014" target="_blank" referrerpolicy="no-referrer-when-downgrade">Defined2014</a> @<a href="https://github.com/bb7133" target="_blank" referrerpolicy="no-referrer-when-downgrade">bb7133</a> @<a href="https://github.com/JmPotato" target="_blank" referrerpolicy="no-referrer-when-downgrade">JmPotato</a> @<a href="https://github.com/Connor1996" target="_blank" referrerpolicy="no-referrer-when-downgrade">Connor1996</a> @<a href="https://github.com/HuSharp" target="_blank" referrerpolicy="no-referrer-when-downgrade">HuSharp</a> @<a href="https://github.com/CalvinNeo" target="_blank" referrerpolicy="no-referrer-when-downgrade">CalvinNeo</a></p><p> <code>FLASHBACK CLUSTER TO TIMESTAMP</code> 支持在 Garbage Collection (GC) life time 内快速回退整个集群到指定的时间点。使用该特性可以快速撤消 DML 误操作。例如，在误执行了没有 <code>WHERE</code> 子句的 <code>DELETE</code> 后，使用 <code>FLASHBACK CLUSTER TO TIMESTAMP</code> 能够在几分钟内将集群数据恢复到指定的时间点。该特性不依赖于数据库备份，并支持在时间线上多次回退以确定特定数据更改发生的时间。需要注意的是，<code>FLASHBACK CLUSTER TO TIMESTAMP</code> 不能替代数据库备份。</p><p> 在执行 <code>FLASHBACK CLUSTER TO TIMESTAMP</code> 之前，需要暂停 PITR 和 TiCDC 等工具上运行的同步任务，待 <code>FLASHBACK</code> 执行完成后再启动，否则会造成同步失败等问题。</p><p> 更多信息，请参考<a href="/zh/tidb/stable/sql-statement-flashback-cluster">用户文档</a>。</p></li><li><p>支持通过 <code>FLASHBACK DATABASE</code> 命令来恢复被删除的数据库 <a href="https://github.com/pingcap/tidb/issues/20463" target="_blank" referrerpolicy="no-referrer-when-downgrade">#20463</a> @<a href="https://github.com/erwadba" target="_blank" referrerpolicy="no-referrer-when-downgrade">erwadba</a></p><p> <code>FLASHBACK DATABASE</code> 支持在 Garbage Collection (GC) life time 时间内恢复被 <code>DROP</code> 删除的数据库以及数据。该特性不依赖任何外部工具，可以轻松快速地通过 SQL 语句进行数据和元信息的恢复。</p><p> 更多信息，请参考<a href="/zh/tidb/stable/sql-statement-flashback-database">用户文档</a>。</p></li></ul><h3 id="安全" style="position:relative">安全<a href="#%E5%AE%89%E5%85%A8" aria-label="安全 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><p>TiFlash 静态加密支持国密算法 SM4 <a href="https://github.com/pingcap/tiflash/issues/5953" target="_blank" referrerpolicy="no-referrer-when-downgrade">#5953</a> @<a href="https://github.com/lidezhu" target="_blank" referrerpolicy="no-referrer-when-downgrade">lidezhu</a></p><p> TiFlash 的静态加密新增 SM4 算法，你可以将配置文件 <code>tiflash-learner.toml</code> 中的 <code>data-encryption-method</code> 参数的值设置为 <code>sm4-ctr</code>，以启用基于国密算法 SM4 的静态加密能力。</p><p> 更多信息，请参考<a href="/zh/tidb/stable/encryption-at-rest#tiflash">用户文档</a>。</p></li></ul><h3 id="可观测性" style="position:relative">可观测性<a href="#%E5%8F%AF%E8%A7%82%E6%B5%8B%E6%80%A7" aria-label="可观测性 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><p>集群诊断功能 GA <a href="https://github.com/pingcap/tidb-dashboard/issues/1438" target="_blank" referrerpolicy="no-referrer-when-downgrade">#1438</a> @<a href="https://github.com/Hawkson-jee" target="_blank" referrerpolicy="no-referrer-when-downgrade">Hawkson-jee</a></p><p> <a href="/zh/tidb/stable/dashboard-diagnostics-access">集群诊断功能</a>是在指定的时间范围内，对集群可能存在的问题进行诊断，并将诊断结果和一些集群相关的负载监控信息汇总成一个<a href="/zh/tidb/stable/dashboard-diagnostics-report">诊断报告</a>。诊断报告是网页形式，通过浏览器保存后可离线浏览和传阅。</p><p> 你可以通过该报告快速了解集群内的基本诊断信息，包括负载、组件、耗时和配置信息。若集群存在一些常见问题，在<a href="/zh/tidb/stable/dashboard-diagnostics-report#诊断信息">诊断信息</a>部分可以了解 TiDB 内置自动诊断的结果。</p></li></ul><h3 id="性能" style="position:relative">性能<a href="#%E6%80%A7%E8%83%BD" aria-label="性能 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><p>引入 Coprocessor Task 并发度自适应机制 <a href="https://github.com/pingcap/tidb/issues/37724" target="_blank" referrerpolicy="no-referrer-when-downgrade">#37724</a> @<a href="https://github.com/you06" target="_blank" referrerpolicy="no-referrer-when-downgrade">you06</a></p><p> 随着 Coprocessor Task 任务数增加，TiDB 将结合 TiKV 处理速度自动增加任务并发度（调整 <a href="/zh/tidb/stable/system-variables#tidb_distsql_scan_concurrency"><code>tidb_distsql_scan_concurrency</code></a>），减少 Coprocessor Task 任务排队，降低延迟。</p></li><li><p>新增动态规划算法来决定表的连接顺序 <a href="https://github.com/pingcap/tidb/issues/37825" target="_blank" referrerpolicy="no-referrer-when-downgrade">#37825</a> @<a href="https://github.com/winoros" target="_blank" referrerpolicy="no-referrer-when-downgrade">winoros</a></p><p> 在之前的版本中，TiDB 采用贪心算法来决定表的连接顺序。在 v6.4.0 中，优化器引入了<a href="/zh/tidb/stable/join-reorder#join-reorder-动态规划算法实例">动态规划算法</a>。相比贪心算法，动态规划算法会枚举更多可能的连接顺序，进而有机会发现更好的执行计划，提升部分场景下 SQL 执行效率。</p><p> 由于动态规划算法的枚举过程可能消耗更多的时间，目前 Join Reorder 算法由变量 <a href="/zh/tidb/stable/system-variables#tidb_opt_join_reorder_threshold"><code>tidb_opt_join_reorder_threshold</code></a> 控制，当参与 Join Reorder 的节点个数大于该阈值时选择贪心算法，反之选择动态规划算法。</p><p> 更多信息，请参考<a href="/zh/tidb/stable/join-reorder">用户文档</a>。</p></li><li><p>前缀索引支持对空值进行过滤 <a href="https://github.com/pingcap/tidb/issues/21145" target="_blank" referrerpolicy="no-referrer-when-downgrade">#21145</a> @<a href="https://github.com/xuyifangreeneyes" target="_blank" referrerpolicy="no-referrer-when-downgrade">xuyifangreeneyes</a></p><p> 该特性是对前缀索引使用上的优化。当表中某列存在前缀索引，那么 SQL 语句中对该列的 <code>IS NULL</code> 或 <code>IS NOT NULL</code> 条件可以直接利用前缀进行过滤，避免了这种情况下的回表，提升了 SQL 语句的执行性能。</p><p> 更多信息，请参考<a href="/zh/tidb/stable/system-variables#tidb_opt_prefix_index_single_scan-从-v640-版本开始引入">用户文档</a>。</p></li><li><p>增强 TiDB Chunk 复用机制 <a href="https://github.com/pingcap/tidb/issues/38606" target="_blank" referrerpolicy="no-referrer-when-downgrade">#38606</a> @<a href="https://github.com/keeplearning20221" target="_blank" referrerpolicy="no-referrer-when-downgrade">keeplearning20221</a></p><p> 在之前的版本中，TiDB 只在 <code>writechunk</code> 函数中复用 Chunk。TiDB v6.4.0 扩展 Chunk 复用机制到 Executor 的算子中，通过复用 Chunk 减少 TiDB 申请释放内存频率，进而提升部分场景下的 SQL 查询执行效率。你可以通过系统变量 <a href="/zh/tidb/stable/system-variables#tidb_enable_reuse_chunk-从-v640-版本开始引入"><code>tidb_enable_reuse_chunk</code></a> 来控制是否启用 Chunk 对象复用，默认为开启。</p></li><li><p>引入新的优化器提示 <code>NO_DECORRELATE</code> 来控制关联优化的解除 <a href="https://github.com/pingcap/tidb/issues/37789" target="_blank" referrerpolicy="no-referrer-when-downgrade">#37789</a> @<a href="https://github.com/time-and-fate" target="_blank" referrerpolicy="no-referrer-when-downgrade">time-and-fate</a></p><p> 默认情况下，TiDB 总是会尝试重写关联子查询以解除关联，这通常会提高执行效率。但是在一部分场景下，解除关联反而会降低执行效率。TiDB 在 v6.4.0 版本中引入了 hint <code>NO_DECORRELATE</code>，用来提示优化器不要对指定的查询块解除关联，以提升部分场景下的查询性能。</p><p> 更多信息，请参考<a href="/zh/tidb/stable/optimizer-hints#no_decorrelate">用户文档</a>。</p></li><li><p>提升了分区表统计信息收集的性能 <a href="https://github.com/pingcap/tidb/issues/37977" target="_blank" referrerpolicy="no-referrer-when-downgrade">#37977</a> @<a href="https://github.com/Yisaer" target="_blank" referrerpolicy="no-referrer-when-downgrade">Yisaer</a></p><p> 在 v6.4.0 版本中，TiDB 优化了分区表统计信息的收集策略。你可以通过系统变量 <a href="/zh/tidb/stable/system-variables#tidb_auto_analyze_partition_batch_size-从-v640-版本开始引入"><code>tidb_auto_analyze_partition_batch_size</code></a> 定义并发度，用并行的方式同时收集多个分区的统计信息，从而加快统计信息收集的速度，减少 analyze 所需的时间。</p></li></ul><h3 id="稳定性" style="position:relative">稳定性<a href="#%E7%A8%B3%E5%AE%9A%E6%80%A7" aria-label="稳定性 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><p>磁盘故障、I/O 无响应等极端情况下的故障恢复加速 <a href="https://github.com/tikv/tikv/issues/13648" target="_blank" referrerpolicy="no-referrer-when-downgrade">#13648</a> @<a href="https://github.com/LykxSassinator" target="_blank" referrerpolicy="no-referrer-when-downgrade">LykxSassinator</a></p><p> 数据库的可用性是企业用户最为关注的指标之一，但是在复杂的硬件环境下，如何快速检测故障并恢复一直是数据库面临的挑战之一。TiDB v6.4.0 全面优化了 TiKV 节点的状态检测机制。即使在磁盘故障或 I/O 无响应等极端情况下，TiDB 依然可以快速上报节点状态，同时搭配主动唤醒机制，提前发起 Leader 选举，加速集群自愈。通过这次优化，TiDB 在磁盘故障场景下，集群恢复时间可以缩短 50% 左右。</p></li><li><p>TiDB 全局内存控制（实验特性）<a href="https://github.com/pingcap/tidb/issues/37816" target="_blank" referrerpolicy="no-referrer-when-downgrade">#37816</a> @<a href="https://github.com/wshwsh12" target="_blank" referrerpolicy="no-referrer-when-downgrade">wshwsh12</a></p><p> v6.4.0 引入了全局内存控制，对 TiDB 实例的全局内存使用进行追踪。你可以通过系统变量 <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> 设置全局内存的使用上限。当内存使用量接近预设的上限时，TiDB 会尝试对内存进行回收，释放更多的可用内存；当内存使用量超出预设的上限时，TiDB 会识别出当前内存使用量最大的 SQL 操作，并取消这个操作，避免因为内存使用过度而产生的系统性问题。</p><p> 当 TiDB 实例的内存消耗存在潜在风险时，TiDB 会预先收集诊断信息并写入指定目录，方便对问题的诊断。同时，TiDB 提供了系统表视图 <a href="/zh/tidb/stable/information-schema-memory-usage"><code>INFORMATION_SCHEMA.MEMORY_USAGE</code></a> 和 <a href="/zh/tidb/stable/information-schema-memory-usage-ops-history"><code>INFORMATION_SCHEMA.MEMORY_USAGE_OPS_HISTORY</code></a> 用来展示内存使用情况及历史操作，帮助用户清晰了解内存使用状况。</p><p> 全局内存控制是 TiDB 内存管理的重要一步，对实例采用全局视角，引入系统性方法对内存用量进行管理，这可以极大提升数据库的稳定性，提高服务的可用性，支持 TiDB 在更多重要场景平稳运行。</p><p> 更多信息，请参考<a href="/zh/tidb/stable/configure-memory-usage">用户文档</a>。</p></li><li><p>控制优化器在构造范围时的内存占用 <a href="https://github.com/pingcap/tidb/issues/37176" target="_blank" referrerpolicy="no-referrer-when-downgrade">#37176</a> @<a href="https://github.com/xuyifangreeneyes" target="_blank" referrerpolicy="no-referrer-when-downgrade">xuyifangreeneyes</a></p><p> v6.4.0 引入了系统变量 <a href="/zh/tidb/stable/system-variables#tidb_opt_range_max_size-从-v640-版本开始引入"><code>tidb_opt_range_max_size</code></a> 来限制优化器在构造范围时消耗的内存上限。当内存使用超出这个限制，则放弃构造精确的范围，转而构建更粗粒度的范围，以此降低内存消耗。当 SQL 语句中的 <code>IN</code> 条件较多时，这个优化可以显著降低编译时的内存使用量，保证系统的稳定性。</p><p> 更多信息，请参考<a href="/zh/tidb/stable/system-variables#tidb_opt_range_max_size-从-v640-版本开始引入">用户文档</a>。</p></li><li><p>支持统计信息的同步加载（GA）<a href="https://github.com/pingcap/tidb/issues/37434" target="_blank" referrerpolicy="no-referrer-when-downgrade">#37434</a> @<a href="https://github.com/chrysan" target="_blank" referrerpolicy="no-referrer-when-downgrade">chrysan</a></p><p> TiDB v6.4.0 起，正式开启了统计信息同步加载的特性（默认开启），支持在执行当前 SQL 语句时将直方图、TopN、CMSketch 等占用空间较大的统计信息同步加载到内存，提高优化该 SQL 语句时统计信息的完整性。</p><p> 更多信息，请参考<a href="/zh/tidb/stable/system-variables#tidb_stats_load_sync_wait-从-v540-版本开始引入">用户文档</a>。</p></li><li><p>降低批量写入请求对轻量级事务写入的响应时间的影响 <a href="https://github.com/tikv/tikv/issues/13313" target="_blank" referrerpolicy="no-referrer-when-downgrade">#13313</a> @<a href="https://github.com/glorv" target="_blank" referrerpolicy="no-referrer-when-downgrade">glorv</a></p><p> 定时批量 DML 任务存在于一部分系统的业务逻辑中。在此场景下，处理这些批量写入任务会增加在线交易的时延。在 v6.3.0 中，TiKV 对混合负载场景下读请求的优先级进行了优化，你可以通过 <a href="/zh/tidb/stable/tikv-configuration-file#auto-adjust-pool-size-从-v630-版本开始引入"><code>readpool.unified.auto-adjust-pool-size</code></a> 配置项开启 TiKV 对统一处理读请求的线程池 (UnifyReadPool) 大小的自动调整。在 v6.4.0 中，TiKV 对写入请求也进行了动态识别和优先级调整，控制 Apply 线程每一轮处理单个状态机写入的最大数据量，从而降低批量写入对交易事务写入的响应时间的影响。</p></li></ul><h3 id="易用性" style="position:relative">易用性<a href="#%E6%98%93%E7%94%A8%E6%80%A7" aria-label="易用性 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><p>TiKV API V2 成为正式功能 <a href="https://github.com/tikv/tikv/issues/11745" target="_blank" referrerpolicy="no-referrer-when-downgrade">#11745</a> @<a href="https://github.com/pingyu" target="_blank" referrerpolicy="no-referrer-when-downgrade">pingyu</a></p><p> 在 v6.1.0 之前，TiKV 的 RawKV 接口仅存储客户端传入的原始数据，因此只提供基本的 Key-Value 读写能力。此外，由于编码方式不同、数据范围没有隔离等，同一个 TiKV 集群中，TiDB、事务 KV、RawKV 无法同时使用，因此对于不同使用方式并存的场景，必须部署多个集群，增加了机器和部署成本。</p><p> TiKV API V2 提供了新的存储格式，功能亮点如下：</p><ul><li>RawKV 数据以 MVCC 方式存储，记录数据的变更时间戳，并在此基础上提供 Change Data Capture 能力（实验特性，见 <a href="https://github.com/tikv/migration/blob/main/cdc/README.md" target="_blank" referrerpolicy="no-referrer-when-downgrade">TiKV-CDC</a>）。</li><li>数据根据使用方式划分范围，支持单一集群 TiDB、事务 KV、RawKV 应用共存。</li><li>预留 Key Space 字段，为多租户等特性提供支持。</li></ul><p>你可以通过在 TiKV 的 <code>[storage]</code> 配置中设置 <code>api-version = 2</code> 来启用 TiKV API V2。</p><p>更多信息，请参考<a href="/zh/tidb/stable/tikv-configuration-file#api-version-从-v610-版本开始引入">用户文档</a>。</p></li><li><p>优化 TiFlash 数据同步进度的准确性 <a href="https://github.com/pingcap/tiflash/issues/4902" target="_blank" referrerpolicy="no-referrer-when-downgrade">#4902</a> @<a href="https://github.com/hehechen" target="_blank" referrerpolicy="no-referrer-when-downgrade">hehechen</a></p><p> TiDB 的 <code>INFORMATION_SCHEMA.TIFLASH_REPLICA</code> 表中的 <code>PROGRESS</code> 字段表示 TiFlash 副本与 TiKV 中对应表数据的同步进度。在之前的版本中，<code>PROCESS</code> 字段只显示 TiFlash 副本创建过程中的数据同步进度。在 TiFlash 副本创建完后，当在 TiKV 相应的表中导入新的数据时，该值不会更新数据的同步进度。</p><p> v6.4.0 版本改进了 TiFlash 副本数据同步进度更新机制。在创建 TiFlash 副本后，进行数据导入等操作，TiFlash 副本需要和 TiKV 数据进行同步时，<a href="/zh/tidb/stable/information-schema-tiflash-replica"><code>INFORMATION_SCHEMA.TIFLASH_REPLICA</code></a> 表中的 <code>PROGRESS</code> 值将会更新，显示实际的数据同步进度。通过此优化，你可以方便地查看 TiFlash 数据同步的实际进度。</p><p> 更多信息，请参考<a href="/zh/tidb/stable/information-schema-tiflash-replica">用户文档</a>。</p></li></ul><h3 id="mysql-兼容性" style="position:relative">MySQL 兼容性<a href="#mysql-%E5%85%BC%E5%AE%B9%E6%80%A7" aria-label="mysql 兼容性 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><p>TiDB 分区表兼容 Linear Hash 分区语法 <a href="https://github.com/pingcap/tidb/issues/38450" target="_blank" referrerpolicy="no-referrer-when-downgrade">#38450</a> @<a href="https://github.com/mjonss" target="_blank" referrerpolicy="no-referrer-when-downgrade">mjonss</a></p><p> TiDB 现有的分区方式支持 Hash、Range、List 分区。TiDB v6.4.0 增加了对 <a href="https://dev.mysql.com/doc/refman/5.7/en/partitioning-linear-hash.html" target="_blank" referrerpolicy="no-referrer-when-downgrade">MySQL LINEAR HASH</a> 分区语法的兼容。</p><p> 在 TiDB 上，你可以直接执行原有的 MySQL Linear Hash 分区的 DDL 语句，TiDB 将创建一个常规的非线性 Hash 分区表（注意 TiDB 内部实际不存在 LINEAR HASH 分区）。你也可以直接执行原有的 MySQL LINEAR HASH 分区的 DML 语句，TiDB 将正常返回对应的 TiDB Hash 分区的查询结果。此功能保证了 TiDB 对 MySQL LINEAR HASH 分区的语法兼容，方便基于 MySQL 的应用无缝迁移到 TiDB。</p><p> 当分区数是 2 的幂时，TiDB Hash 分区表中行的分布情况与 MySQL Linear Hash 分区表相同，但当分区数不是 2 的幂时，TiDB Hash 分区表中行的分布情况与 MySQL Linear Hash 分区表会有所区别。</p><p> 更多信息，请参考<a href="/zh/tidb/stable/partitioned-table#tidb-对-linear-hash-分区的处理">用户文档</a>。</p></li><li><p>支持高性能、全局单调递增的 <code>AUTO_INCREMENT</code> 列属性（实验特性）<a href="https://github.com/pingcap/tidb/issues/38442" target="_blank" referrerpolicy="no-referrer-when-downgrade">#38442</a> @<a href="https://github.com/tiancaiamao" target="_blank" referrerpolicy="no-referrer-when-downgrade">tiancaiamao</a></p><p> TiDB v6.4.0 引入了 <code>AUTO_INCREMENT</code> 的 MySQL 兼容模式，通过中心化分配自增 ID，实现了自增 ID 在所有 TiDB 实例上单调递增。使用该特性能够更容易地实现查询结果按自增 ID 排序。要使用 MySQL 兼容模式，你需要在建表时将 <code>AUTO_ID_CACHE</code> 设置为 <code>1</code>。</p><pre><code class="hljs language-sql"><div class="MuiBox-root css-1qhimia"><span class="hljs-keyword">CREATE</span> <span class="hljs-keyword">TABLE</span> t(a <span class="hljs-type">int</span> AUTO_INCREMENT key) AUTO_ID_CACHE <span class="hljs-number">1</span>; </div><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeSmall css-1rmx1rm" tabindex="0" type="button" aria-label="Toggle code wrap"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="WrapTextIcon"><path d="M4 19h6v-2H4v2zM20 5H4v2h16V5zm-3 6H4v2h13.25c1.1 0 2 .9 2 2s-.9 2-2 2H15v-2l-3 3 3 3v-2h2c2.21 0 4-1.79 4-4s-1.79-4-4-4z"/></svg></button><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeSmall css-fxo539" tabindex="0" type="button" aria-label="copy"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ContentCopyIcon"><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"/></svg></button></code></pre><p> 更多信息，请参考<a href="/zh/tidb/stable/auto-increment#mysql-兼容模式">用户文档</a>。</p></li><li><p>支持对 JSON 类型中的 Array 数据做范围选择 <a href="https://github.com/tikv/tikv/issues/13644" target="_blank" referrerpolicy="no-referrer-when-downgrade">#13644</a> @<a href="https://github.com/YangKeao" target="_blank" referrerpolicy="no-referrer-when-downgrade">YangKeao</a></p><p> 从 v6.4.0 起，TiDB 支持 <a href="https://dev.mysql.com/doc/refman/8.0/en/json.html#json-paths" target="_blank" referrerpolicy="no-referrer-when-downgrade">MySQL 兼容的范围选择语法</a>。</p><ul><li><p>通过关键字 <code>to</code>，你可以指定元素起始和结束的位置，并选择 Array 中连续范围的元素，起始位置记为 <code>0</code>。例如，使用 <code>$[0 to 2]</code> 可以选择 Array 中的前三个元素。</p></li><li><p>通过关键字 <code>last</code>，你可以指定 Array 中最后一个元素的位置，实现从右到左的位置设定。例如，使用 <code>$[last-2 to last]</code> 可以选择 Array 中的最后三个元素。</p><p>该特性简化了 SQL 的编写过程，进一步提升了 JSON 类型的兼容能力，降低了 MySQL 应用向 TiDB 迁移的难度。</p></li></ul></li><li><p>支持对数据库用户增加额外说明 <a href="https://github.com/pingcap/tidb/issues/38172" target="_blank" referrerpolicy="no-referrer-when-downgrade">#38172</a> @<a href="https://github.com/CbcWestwolf" target="_blank" referrerpolicy="no-referrer-when-downgrade">CbcWestwolf</a></p><p> 在 TiDB v6.4.0 中，你可以通过 <a href="/zh/tidb/stable/sql-statement-create-user"><code>CREATE USER</code></a> 或 <a href="/zh/tidb/stable/sql-statement-alter-user"><code>ALTER USER</code></a> 语句为数据库用户添加额外的说明信息。TiDB 提供了两种说明格式，你可以通过 <code>COMMENT</code> 添加一段文本注释，也可以通过 <code>ATTRIBUTE</code> 添加一组 JSON 格式的结构化属性。</p><p> 此外，TiDB v6.4.0 新增了 <a href="/zh/tidb/stable/information-schema-user-attributes"><code>USER_ATTRIBUTES</code></a> 表。你可以在该表中查看用户的注释和属性信息。</p><pre><code class="hljs language-sql"><div class="MuiBox-root css-1qhimia"><span class="hljs-keyword">CREATE</span> <span class="hljs-keyword">USER</span> <span class="hljs-string">'newuser1'</span>@<span class="hljs-string">'%'</span> COMMENT <span class="hljs-string">'This user is created only for test'</span>; <span class="hljs-keyword">CREATE</span> <span class="hljs-keyword">USER</span> <span class="hljs-string">'newuser2'</span>@<span class="hljs-string">'%'</span> ATTRIBUTE <span class="hljs-string">'{"email": "user@pingcap.com"}'</span>; <span class="hljs-keyword">SELECT</span> <span class="hljs-operator">*</span> <span class="hljs-keyword">FROM</span> INFORMATION_SCHAME.USER_ATTRIBUTES; </div><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeSmall css-1rmx1rm" tabindex="0" type="button" aria-label="Toggle code wrap"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="WrapTextIcon"><path d="M4 19h6v-2H4v2zM20 5H4v2h16V5zm-3 6H4v2h13.25c1.1 0 2 .9 2 2s-.9 2-2 2H15v-2l-3 3 3 3v-2h2c2.21 0 4-1.79 4-4s-1.79-4-4-4z"/></svg></button><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeSmall css-fxo539" tabindex="0" type="button" aria-label="copy"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ContentCopyIcon"><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"/></svg></button></code></pre><pre><code class="hljs language-sql"><div class="MuiBox-root css-1qhimia"><span class="hljs-operator">+</span><span class="hljs-comment">-----------+------+---------------------------------------------------+</span> <span class="hljs-operator">|</span> <span class="hljs-keyword">USER</span> <span class="hljs-operator">|</span> HOST <span class="hljs-operator">|</span> ATTRIBUTE <span class="hljs-operator">|</span>