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css-1rnnmjb"><style data-emotion="css 90fn5w">.css-90fn5w{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-flex-direction:column;-ms-flex-direction:column;flex-direction:column;}@media (min-width:0px){.css-90fn5w{-webkit-flex-direction:column-reverse;-ms-flex-direction:column-reverse;flex-direction:column-reverse;}}@media (min-width:600px){.css-90fn5w{-webkit-flex-direction:row;-ms-flex-direction:row;flex-direction:row;}}</style><div class="css-90fn5w"><style data-emotion="css vofosd">.css-vofosd{padding:1.5rem 0;}@media (min-width:0px){.css-vofosd{width:100%;}}@media (min-width:600px){.css-vofosd{width:calc(100% - 17.5rem);}}</style><div class="MuiBox-root css-vofosd"><style data-emotion="css 1ekb41w">.css-1ekb41w{width:100%;margin-left:auto;box-sizing:border-box;margin-right:auto;display:block;padding-left:16px;padding-right:16px;}@media (min-width:600px){.css-1ekb41w{padding-left:24px;padding-right:24px;}}@media (min-width:1536px){.css-1ekb41w{max-width:1536px;}}</style><div class="MuiContainer-root MuiContainer-maxWidthXl doc-content css-1ekb41w"><div class="markdown-body MuiBox-root css-0"><h1 id="statement-summary-tables" style="position:relative"><a href="#statement-summary-tables" aria-label="statement summary tables permalink" class="anchor before"><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>Statement Summary Tables</h1><p>针对 SQL 性能相关的问题，MySQL 在 <code>performance_schema</code> 提供了 <a href="https://dev.mysql.com/doc/refman/5.7/en/performance-schema-statement-summary-tables.html" target="_blank" referrerpolicy="no-referrer-when-downgrade">statement summary tables</a>，用来监控和统计 SQL。例如其中的一张表 <code>events_statements_summary_by_digest</code>，提供了丰富的字段，包括延迟、执行次数、扫描行数、全表扫描次数等，有助于用户定位 SQL 问题。</p><p>为此，从 4.0.0-rc.1 版本开始，TiDB 在 <code>information_schema</code>（<em>而不是</em> <code>performance_schema</code>）中提供与 <code>events_statements_summary_by_digest</code> 功能相似的系统表：</p><ul><li><code>statements_summary</code></li><li><code>statements_summary_history</code></li><li><code>cluster_statements_summary</code></li><li><code>cluster_statements_summary_history</code></li></ul><p>本文将详细介绍这些表，以及如何利用它们来排查 SQL 性能问题。</p><h2 id="statements_summary" style="position:relative"><a href="#statements_summary" aria-label="statements_summary permalink" class="anchor before"><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><code>statements_summary</code></h2><p><code>statements_summary</code> 是 <code>information_schema</code> 里的一张系统表，它把 SQL 按 SQL digest 和 plan digest 分组，统计每一组的 SQL 信息。</p><p>此处的 SQL digest 与 slow log 里的 SQL digest 一样，是把 SQL 规一化后算出的唯一标识符。SQL 的规一化会忽略常量、空白符、大小写的差别。即语法一致的 SQL 语句，其 digest 也相同。</p><p>例如：</p><pre><code class="hljs language-sql"><style data-emotion="css 1qhimia">.css-1qhimia{margin-right:3rem;overflow:auto;}</style><div class="MuiBox-root css-1qhimia"><span class="hljs-keyword">SELECT</span> <span class="hljs-operator">*</span> <span class="hljs-keyword">FROM</span> employee <span class="hljs-keyword">WHERE</span> id <span class="hljs-keyword">IN</span> (<span class="hljs-number">1</span>, <span class="hljs-number">2</span>, <span class="hljs-number">3</span>) <span class="hljs-keyword">AND</span> salary <span class="hljs-keyword">BETWEEN</span> <span class="hljs-number">1000</span> <span class="hljs-keyword">AND</span> <span class="hljs-number">2000</span>; <span class="hljs-keyword">select</span> <span class="hljs-operator">*</span> <span class="hljs-keyword">from</span> EMPLOYEE <span class="hljs-keyword">where</span> ID <span class="hljs-keyword">in</span> (<span class="hljs-number">4</span>, <span class="hljs-number">5</span>) <span class="hljs-keyword">and</span> SALARY <span class="hljs-keyword">between</span> <span class="hljs-number">3000</span> <span class="hljs-keyword">and</span> <span class="hljs-number">4000</span>; </div><style data-emotion="css ux9q70">.css-ux9q70{text-align:center;-webkit-flex:0 0 auto;-ms-flex:0 0 auto;flex:0 0 auto;font-size:1.5rem;padding:8px;border-radius:50%;overflow:visible;color:rgba(0, 0, 0, 0.54);-webkit-transition:background-color 150ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;transition:background-color 150ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;padding:5px;font-size:1.125rem;top:0.625rem;right:2.4rem;background:transparent;border:unset;}.css-ux9q70:hover{background-color:rgba(0, 0, 0, 0.04);}@media (hover: none){.css-ux9q70:hover{background-color:transparent;}}.css-ux9q70.Mui-disabled{background-color:transparent;color:rgba(0, 0, 0, 0.26);}</style><style data-emotion="css 1rmx1rm">.css-1rmx1rm{display:-webkit-inline-box;display:-webkit-inline-flex;display:-ms-inline-flexbox;display:inline-flex;-webkit-align-items:center;-webkit-box-align:center;-ms-flex-align:center;align-items:center;-webkit-box-pack:center;-ms-flex-pack:center;-webkit-justify-content:center;justify-content:center;position:relative;box-sizing:border-box;-webkit-tap-highlight-color:transparent;background-color:transparent;outline:0;border:0;margin:0;border-radius:0;padding:0;cursor:pointer;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;vertical-align:middle;-moz-appearance:none;-webkit-appearance:none;-webkit-text-decoration:none;text-decoration:none;color:inherit;text-align:center;-webkit-flex:0 0 auto;-ms-flex:0 0 auto;flex:0 0 auto;font-size:1.5rem;padding:8px;border-radius:50%;overflow:visible;color:rgba(0, 0, 0, 0.54);-webkit-transition:background-color 150ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;transition:background-color 150ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;padding:5px;font-size:1.125rem;top:0.625rem;right:2.4rem;background:transparent;border:unset;}.css-1rmx1rm::-moz-focus-inner{border-style:none;}.css-1rmx1rm.Mui-disabled{pointer-events:none;cursor:default;}@media print{.css-1rmx1rm{-webkit-print-color-adjust:exact;color-adjust:exact;}}.css-1rmx1rm:hover{background-color:rgba(0, 0, 0, 0.04);}@media (hover: none){.css-1rmx1rm:hover{background-color:transparent;}}.css-1rmx1rm.Mui-disabled{background-color:transparent;color:rgba(0, 0, 0, 0.26);}</style><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeSmall css-1rmx1rm" tabindex="0" type="button" aria-label="Toggle code wrap"><style data-emotion="css 1cw4hi4">.css-1cw4hi4{-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;width:1em;height:1em;display:inline-block;fill:currentColor;-webkit-flex-shrink:0;-ms-flex-negative:0;flex-shrink:0;-webkit-transition:fill 200ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;transition:fill 200ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;font-size:inherit;}</style><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><style data-emotion="css 1e2dcm1">.css-1e2dcm1{z-index:1500;pointer-events:none;}</style><style data-emotion="css okvapm">.css-okvapm{z-index:1500;pointer-events:none;}</style><style data-emotion="css rnn29l">.css-rnn29l{text-align:center;-webkit-flex:0 0 auto;-ms-flex:0 0 auto;flex:0 0 auto;font-size:1.5rem;padding:8px;border-radius:50%;overflow:visible;color:rgba(0, 0, 0, 0.54);-webkit-transition:background-color 150ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;transition:background-color 150ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;padding:5px;font-size:1.125rem;top:0.625rem;right:0.625rem;background:transparent;border:unset;}.css-rnn29l:hover{background-color:rgba(0, 0, 0, 0.04);}@media (hover: none){.css-rnn29l:hover{background-color:transparent;}}.css-rnn29l.Mui-disabled{background-color:transparent;color:rgba(0, 0, 0, 0.26);}</style><style data-emotion="css fxo539">.css-fxo539{display:-webkit-inline-box;display:-webkit-inline-flex;display:-ms-inline-flexbox;display:inline-flex;-webkit-align-items:center;-webkit-box-align:center;-ms-flex-align:center;align-items:center;-webkit-box-pack:center;-ms-flex-pack:center;-webkit-justify-content:center;justify-content:center;position:relative;box-sizing:border-box;-webkit-tap-highlight-color:transparent;background-color:transparent;outline:0;border:0;margin:0;border-radius:0;padding:0;cursor:pointer;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;vertical-align:middle;-moz-appearance:none;-webkit-appearance:none;-webkit-text-decoration:none;text-decoration:none;color:inherit;text-align:center;-webkit-flex:0 0 auto;-ms-flex:0 0 auto;flex:0 0 auto;font-size:1.5rem;padding:8px;border-radius:50%;overflow:visible;color:rgba(0, 0, 0, 0.54);-webkit-transition:background-color 150ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;transition:background-color 150ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;padding:5px;font-size:1.125rem;top:0.625rem;right:0.625rem;background:transparent;border:unset;}.css-fxo539::-moz-focus-inner{border-style:none;}.css-fxo539.Mui-disabled{pointer-events:none;cursor:default;}@media print{.css-fxo539{-webkit-print-color-adjust:exact;color-adjust:exact;}}.css-fxo539:hover{background-color:rgba(0, 0, 0, 0.04);}@media (hover: none){.css-fxo539:hover{background-color:transparent;}}.css-fxo539.Mui-disabled{background-color:transparent;color:rgba(0, 0, 0, 0.26);}</style><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>归一化后都是：</p><pre><code class="hljs language-sql"><div class="MuiBox-root css-1qhimia"><span class="hljs-keyword">select</span> <span class="hljs-operator">*</span> <span class="hljs-keyword">from</span> employee <span class="hljs-keyword">where</span> id <span class="hljs-keyword">in</span> (...) <span class="hljs-keyword">and</span> salary <span class="hljs-keyword">between</span> ? <span class="hljs-keyword">and</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>此处的 plan digest 是把执行计划规一化后算出的唯一标识符。执行计划的规一化会忽略常量的差别。由于相同的 SQL 可能产生不同的执行计划，所以可能分到多个组，同一个组内的执行计划是相同的。</p><p><code>statements_summary</code> 用于保存 SQL 监控指标聚合后的结果。一般来说，每一项监控指标都包含平均值和最大值。例如执行延时对应 <code>AVG_LATENCY</code> 和 <code>MAX_LATENCY</code> 两个字段，分别是平均延时和最大延时。</p><p>为了监控指标的即时性，<code>statements_summary</code> 里的数据定期被清空，只展现最近一段时间内的聚合结果。清空周期由系统变量 <code>tidb_stmt_summary_refresh_interval</code> 设置。如果刚好在清空之后进行查询，显示的数据可能很少。</p><p>以下为查询 <code>statements_summary</code> 的部分结果：</p><pre><code class="hljs language-"><div class="MuiBox-root css-1qhimia"> SUMMARY_BEGIN_TIME: 2020-01-02 11:00:00 SUMMARY_END_TIME: 2020-01-02 11:30:00 STMT_TYPE: Select SCHEMA_NAME: test DIGEST: 0611cc2fe792f8c146cc97d39b31d9562014cf15f8d41f23a4938ca341f54182 DIGEST_TEXT: select * from employee where id = ? TABLE_NAMES: test.employee INDEX_NAMES: NULL SAMPLE_USER: root EXEC_COUNT: 3 SUM_LATENCY: 1035161 MAX_LATENCY: 399594 MIN_LATENCY: 301353 AVG_LATENCY: 345053 AVG_PARSE_LATENCY: 57000 MAX_PARSE_LATENCY: 57000 AVG_COMPILE_LATENCY: 175458 MAX_COMPILE_LATENCY: 175458 ........... AVG_MEM: 103 MAX_MEM: 103 AVG_DISK: 65535 MAX_DISK: 65535 AVG_AFFECTED_ROWS: 0 FIRST_SEEN: 2020-01-02 11:12:54 LAST_SEEN: 2020-01-02 11:25:24 QUERY_SAMPLE_TEXT: select * from employee where id=3100 PREV_SAMPLE_TEXT: PLAN_DIGEST: f415b8d52640b535b9b12a9c148a8630d2c6d59e419aad29397842e32e8e5de3 PLAN: Point_Get_1 root 1 table:employee, handle:3100 </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><style data-emotion="css 1weqspv">.css-1weqspv{padding-top:0.5rem;padding-bottom:0.5rem;}.css-1weqspv .MuiAlert-message p{margin-bottom:0px;margin-top:0px;}</style><div class="MuiBox-root css-1weqspv"><style data-emotion="css 17zlexa">.css-17zlexa{font-size:0.875rem;line-height:1.25rem;font-family:"Helvetica Neue","sans-serif";font-weight:400;font-style:normal;color:rgb(1, 67, 97);background-color:rgb(229, 246, 253);display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;padding:6px 16px;}.css-17zlexa .MuiAlert-icon{color:#03a9f4;}</style><style data-emotion="css 152gid5">.css-152gid5{background-color:#fff;color:rgba(0, 0, 0, 0.87);-webkit-transition:box-shadow 300ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;transition:box-shadow 300ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;border-radius:4px;box-shadow:none;font-size:0.875rem;line-height:1.25rem;font-family:"Helvetica Neue","sans-serif";font-weight:400;font-style:normal;color:rgb(1, 67, 97);background-color:rgb(229, 246, 253);display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;padding:6px 16px;}.css-152gid5 .MuiAlert-icon{color:#03a9f4;}</style><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardInfo MuiAlert-standard css-152gid5" role="alert"><style data-emotion="css 1l54tgj">.css-1l54tgj{margin-right:12px;padding:7px 0;display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;font-size:22px;opacity:0.9;}</style><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><style data-emotion="css 1xsto0d">.css-1xsto0d{padding:8px 0;min-width:0;overflow:auto;}</style><div class="MuiAlert-message css-1xsto0d"><style data-emotion="css 1h2y6o4">.css-1h2y6o4{font-weight:500;margin-top:-2px;}</style><style data-emotion="css 17ioyuk">.css-17ioyuk{margin:0;font-size:1rem;line-height:1.5rem;font-family:"Helvetica Neue","sans-serif";font-weight:400;font-style:normal;color:#666666;margin-bottom:0.35em;font-weight:500;margin-top:-2px;}</style><div class="MuiTypography-root MuiTypography-body1 MuiTypography-gutterBottom MuiAlertTitle-root css-17ioyuk">注意</div><p>在 TiDB 中，statement summary tables 中字段的时间单位是纳秒 (ns)，而 MySQL 中的时间单位是皮秒 (ps)。</p></div></div></div><h2 id="statements_summary_history" style="position:relative"><a href="#statements_summary_history" aria-label="statements_summary_history permalink" class="anchor before"><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><code>statements_summary_history</code></h2><p><code>statements_summary_history</code> 的表结构与 <code>statements_summary</code> 完全相同，用于保存历史时间段的数据。通过历史数据，可以排查过去出现的异常，也可以对比不同时间的监控指标。</p><p>字段 <code>SUMMARY_BEGIN_TIME</code> 和 <code>SUMMARY_END_TIME</code> 代表历史时间段的开始时间和结束时间。</p><h2 id="statements_summary_evicted" style="position:relative"><a href="#statements_summary_evicted" aria-label="statements_summary_evicted permalink" class="anchor before"><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><code>statements_summary_evicted</code></h2><p><code>statements_summary</code> 表的容量受 <code>tidb_stmt_summary_max_stmt_count</code> 配置控制，内部使用 LRU 算法，一旦接收到的 SQL 种类超过了 <code>tidb_stmt_summary_max_stmt_count</code>，表中最久未被命中的记录就会被驱逐出表。TiDB 引入了 <code>statements_summary_evicted</code> 表，该表记录了各个时段被驱逐 SQL 语句的具体数量。</p><p>只有当 SQL 语句被 <code>statement summary</code> 表驱逐的时候，<code>statements_summary_evicted</code> 表的内容才会更新。<code>statements_summary_evicted</code> 表记录发生驱逐的时间段和被驱逐 SQL 的数量。</p><h2 id="statement-summary-的-cluster-表" style="position:relative"><a href="#statement-summary-%E7%9A%84-cluster-%E8%A1%A8" aria-label="statement summary 的 cluster 表 permalink" class="anchor before"><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>statement summary 的 cluster 表</h2><p><code>statements_summary</code>、<code>statements_summary_history</code> 和 <code>statements_summary_evicted</code> 仅显示单台 TiDB server 的 statement summary 数据。若要查询整个集群的数据，需要查询 <code>cluster_statements_summary</code>、<code>cluster_statements_summary_history</code> 或 <code>cluster_statements_summary_evicted</code> 表。</p><p><code>cluster_statements_summary</code> 显示各台 TiDB server 的 <code>statements_summary</code> 数据，<code>cluster_statements_summary_history</code> 显示各台 TiDB server 的 <code>statements_summary_history</code> 数据，而 <code>cluster_statements_summary_evicted</code> 则显示各台 TiDB server 的 <code>statements_summary_evicted</code> 数据。这三张表用字段 <code>INSTANCE</code> 表示 TiDB server 的地址，其他字段与 <code>statements_summary</code>、<code>statements_summary_history</code> 和 <code>statements_summary_evicted</code> 表相同。</p><h2 id="参数配置" style="position:relative"><a href="#%E5%8F%82%E6%95%B0%E9%85%8D%E7%BD%AE" aria-label="参数配置 permalink" class="anchor before"><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>参数配置</h2><p>以下系统变量用于控制 statement summary：</p><ul><li><code>tidb_enable_stmt_summary</code>：是否打开 statement summary 功能。1 代表打开，0 代表关闭，默认打开。statement summary 关闭后，系统表里的数据会被清空，下次打开后重新统计。经测试，打开后对性能几乎没有影响。</li><li><code>tidb_stmt_summary_refresh_interval</code>：<code>statements_summary</code> 的清空周期，单位是秒 (s)，默认值是 <code>1800</code>。</li><li><code>tidb_stmt_summary_history_size</code>：<code>statements_summary_history</code> 保存每种 SQL 的历史的数量，也是 <code>statements_summary_evicted</code> 的表容量，默认值是 <code>24</code>。</li><li><code>tidb_stmt_summary_max_stmt_count</code>：statement summary tables 保存的 SQL 种类数量，默认 3000 条。当 SQL 种类超过该值时，会移除最近没有使用的 SQL。这些 SQL 将会被 <code>DIGEST</code> 为 <code>NULL</code> 的行和 <code>statements_summary_evicted</code> 统计记录。<code>DIGEST</code> 为 <code>NULL</code> 的行数据在 <a href="/zh/tidb/stable/dashboard-statement-list#others">TiDB Dashboard SQL 语句分析列表页面</a> 中显示为 <code>Others</code>。</li><li><code>tidb_stmt_summary_max_sql_length</code>：字段 <code>DIGEST_TEXT</code> 和 <code>QUERY_SAMPLE_TEXT</code> 的最大显示长度，默认值是 4096。</li><li><code>tidb_stmt_summary_internal_query</code>：是否统计 TiDB 的内部 SQL。1 代表统计，0 代表不统计，默认不统计。</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-152gid5" 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-17ioyuk">注意</div><p>当一种 SQL 因为达到 <code>tidb_stmt_summary_max_stmt_count</code> 限制要被移除时，TiDB 会移除该 SQL 语句种类在所有时间段的数据。因此，即使一个时间段内的 SQL 种类数量没有达到上限，显示的 SQL 语句数量也会比实际的少。如遇到该情况，对性能也有一些影响，建议调大 <code>tidb_stmt_summary_max_stmt_count</code> 的值。</p></div></div></div><p>statement summary 配置示例如下：</p><pre><code class="hljs language-sql"><div class="MuiBox-root css-1qhimia"><span class="hljs-keyword">set</span> <span class="hljs-keyword">global</span> tidb_stmt_summary_max_stmt_count <span class="hljs-operator">=</span> <span class="hljs-number">3000</span>; <span class="hljs-keyword">set</span> <span class="hljs-keyword">global</span> tidb_enable_stmt_summary <span class="hljs-operator">=</span> <span class="hljs-literal">true</span>; <span class="hljs-keyword">set</span> <span class="hljs-keyword">global</span> tidb_stmt_summary_refresh_interval <span class="hljs-operator">=</span> <span class="hljs-number">1800</span>; <span class="hljs-keyword">set</span> <span class="hljs-keyword">global</span> tidb_stmt_summary_history_size <span class="hljs-operator">=</span> <span class="hljs-number">24</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>以上配置生效后，<code>statements_summary</code> 每 30 分钟清空一次，<code>statements_summary_history</code> 最多保存 3000 种 SQL 种类的数据，每种类型的 SQL 保存最近出现过的 24 个时间段的数据。<code>statements_summary_evicted</code> 保存最近 24 个发生了 evict 的时间段记录；<code>statements_summary_evicted</code> 则以 30 分钟为一个记录周期，表容量为 24 个时间段。</p><div class="MuiBox-root css-1weqspv"><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardInfo MuiAlert-standard css-152gid5" 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-17ioyuk">注意</div><ul><li>假设某种 SQL 每分钟都出现，那 <code>statements_summary_history</code> 中会保存这种 SQL 最近 12 个小时的数据。但如果某种 SQL 只在每天 00:00 ~ 00:30 出现，则 <code>statements_summary_history</code> 中会保存这种 SQL 24 个时间段的数据，每个时间段的间隔都是 1 天，所以会有这种 SQL 最近 24 天的数据。</li><li><code>tidb_stmt_summary_history_size</code>、<code>tidb_stmt_summary_max_stmt_count</code>、<code>tidb_stmt_summary_max_sql_length</code> 这些配置都影响内存占用，建议根据实际情况调整（取决于 SQL 大小、SQL 数量、机器配置）不宜设置得过大。内存大小可通过 <code>tidb_stmt_summary_history_size</code> * <code>tidb_stmt_summary_max_stmt_count</code> * <code>tidb_stmt_summary_max_sql_length</code> * <code>3</code> 来进行估算。</li></ul></div></div></div><h3 id="为-statement-summary-设定合适的大小" style="position:relative"><a href="#%E4%B8%BA-statement-summary-%E8%AE%BE%E5%AE%9A%E5%90%88%E9%80%82%E7%9A%84%E5%A4%A7%E5%B0%8F" aria-label="为 statement summary 设定合适的大小 permalink" class="anchor before"><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>为 statement summary 设定合适的大小</h3><p>在系统运行一段时间后（视系统负载而定），可以查看 <code>statements_summary</code> 表检查是否发生了 evict，例如：</p><pre><code class="hljs language-sql"><div class="MuiBox-root css-1qhimia"><span class="hljs-keyword">select</span> @<span class="hljs-variable">@global</span>.tidb_stmt_summary_max_stmt_count; <span class="hljs-keyword">select</span> <span class="hljs-built_in">count</span>(<span class="hljs-operator">*</span>) <span class="hljs-keyword">from</span> information_schema.statements_summary; </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-"><div class="MuiBox-root css-1qhimia">+-------------------------------------------+ | @@global.tidb_stmt_summary_max_stmt_count | +-------------------------------------------+ | 3000 | +-------------------------------------------+ 1 row in set (0.001 sec) +----------+ | count(*) | +----------+ | 3001 | +----------+ 1 row in set (0.001 sec) </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>可以发现 <code>statements_summary</code> 表已经满了。再查看 <code>statements_summary_evicted</code> 表检查 evict 的数据。</p><pre><code class="hljs language-sql"><div class="MuiBox-root css-1qhimia"><span class="hljs-keyword">select</span> <span class="hljs-operator">*</span> <span class="hljs-keyword">from</span> information_schema.statements_summary_evicted; </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-"><div class="MuiBox-root css-1qhimia">+---------------------+---------------------+---------------+ | BEGIN_TIME | END_TIME | EVICTED_COUNT | +---------------------+---------------------+---------------+ | 2020-01-02 16:30:00 | 2020-01-02 17:00:00 | 59 | +---------------------+---------------------+---------------+ | 2020-01-02 16:00:00 | 2020-01-02 16:30:00 | 45 | +---------------------+---------------------+---------------+ 2 row in set (0.001 sec) </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>由上可知，对最多 59 种 SQL 发生了 evict。此时，建议将 <code>statements_summary</code> 表的容量至少增大 59 条记录，即至少增大至 3059 条。</p><h2 id="目前的限制" style="position:relative"><a href="#%E7%9B%AE%E5%89%8D%E7%9A%84%E9%99%90%E5%88%B6" aria-label="目前的限制 permalink" class="anchor before"><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>目前的限制</h2><p>由于 statement summary tables 默认都存储在内存中，TiDB server 重启后，statement summary 会全部丢失。</p><p>为解决该问题，TiDB v6.6.0 实验性地引入了 <a href="#%E6%8C%81%E4%B9%85%E5%8C%96-statements-summary">statement summary 持久化</a>功能，该功能默认为关闭。开启该功能后，历史数据不再存储在内存内，而是直接写入磁盘。TiDB server 重启后，历史数据也依然可用。</p><h2 id="持久化-statements-summary" style="position:relative"><a href="#%E6%8C%81%E4%B9%85%E5%8C%96-statements-summary" aria-label="持久化 statements summary permalink" class="anchor before"><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>持久化 statements summary</h2><div class="MuiBox-root css-1weqspv"><style data-emotion="css 1rl2db2">.css-1rl2db2{font-size:0.875rem;line-height:1.25rem;font-family:"Helvetica Neue","sans-serif";font-weight:400;font-style:normal;color:rgb(95, 33, 32);background-color:rgb(253, 237, 237);display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;padding:6px 16px;}.css-1rl2db2 .MuiAlert-icon{color:#ef5350;}</style><style data-emotion="css 21rxh6">.css-21rxh6{background-color:#fff;color:rgba(0, 0, 0, 0.87);-webkit-transition:box-shadow 300ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;transition:box-shadow 300ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;border-radius:4px;box-shadow:none;font-size:0.875rem;line-height:1.25rem;font-family:"Helvetica Neue","sans-serif";font-weight:400;font-style:normal;color:rgb(95, 33, 32);background-color:rgb(253, 237, 237);display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;padding:6px 16px;}.css-21rxh6 .MuiAlert-icon{color:#ef5350;}</style><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardError MuiAlert-standard css-21rxh6" 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-17ioyuk">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><p>如<a href="#%E7%9B%AE%E5%89%8D%E7%9A%84%E9%99%90%E5%88%B6">目前的限制</a>一节所描述，默认情况下 statements summary 只在内存中维护，一旦 TiDB server 发生重启，所有 statements summary 数据都会丢失。自 v6.6.0 起，TiDB 实验性地提供了配置项 <a href="/zh/tidb/stable/tidb-configuration-file#tidb_stmt_summary_enable_persistent-从-v660-版本开始引入"><code>tidb_stmt_summary_enable_persistent</code></a> 来允许用户控制是否开启 statements summary 持久化。</p><p>如果要开启 statements summary 持久化，可以在 TiDB 配置文件中添加如下配置：</p><pre><code class="hljs language-toml"><div class="MuiBox-root css-1qhimia"><span class="hljs-section">[instance]</span> <span class="hljs-attr">tidb_stmt_summary_enable_persistent</span> = <span class="hljs-literal">true</span> <span class="hljs-comment"># 以下配置为默认值，可根据需求调整。</span> <span class="hljs-comment"># tidb_stmt_summary_filename = "tidb-statements.log"</span> <span class="hljs-comment"># tidb_stmt_summary_file_max_days = 3</span> <span class="hljs-comment"># tidb_stmt_summary_file_max_size = 64 # MiB</span> <span class="hljs-comment"># tidb_stmt_summary_file_max_backups = 0</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>开启 statements summary 持久化后，内存中只维护当前的实时数据，不再维护历史数据。历史数据生成后直接被写入磁盘文件，写入周期参考<a href="#%E5%8F%82%E6%95%B0%E9%85%8D%E7%BD%AE">参数配置</a>一节所描述的 <code>tidb_stmt_summary_refresh_interval</code>。后续针对 <code>statements_summary_history</code> 或 <code>cluster_statements_summary_history</code> 表的查询将结合内存和磁盘两处数据返回结果。</p><div class="MuiBox-root css-1weqspv"><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardInfo MuiAlert-standard css-152gid5" 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-17ioyuk">注意</div><ul><li>当开启持久化后，由于不再于内存中维护历史数据，因此<a href="#%E5%8F%82%E6%95%B0%E9%85%8D%E7%BD%AE">参数配置</a>一节所描述的 <code>tidb_stmt_summary_history_size</code> 将不再生效，而是由 <a href="/zh/tidb/stable/tidb-configuration-file#tidb_stmt_summary_file_max_days-从-v660-版本开始引入"><code>tidb_stmt_summary_file_max_days</code></a>、<a href="/zh/tidb/stable/tidb-configuration-file#tidb_stmt_summary_file_max_size-从-v660-版本开始引入"><code>tidb_stmt_summary_file_max_size</code></a> 和 <a href="/zh/tidb/stable/tidb-configuration-file#tidb_stmt_summary_file_max_backups-从-v660-版本开始引入"><code>tidb_stmt_summary_file_max_backups</code></a> 这三项配置来决定历史数据在磁盘上的保留数量和时间。</li><li><code>tidb_stmt_summary_refresh_interval</code> 取值越小，数据写入到磁盘就越实时，但写入磁盘的冗余数据也会随之增多。</li></ul></div></div></div><h2 id="排查示例" style="position:relative"><a href="#%E6%8E%92%E6%9F%A5%E7%A4%BA%E4%BE%8B" aria-label="排查示例 permalink" class="anchor before"><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>排查示例</h2><p>下面用两个示例问题演示如何利用 statement summary 来排查。</p><h3 id="sql-延迟比较大是不是服务端的问题" style="position:relative"><a href="#sql-%E5%BB%B6%E8%BF%9F%E6%AF%94%E8%BE%83%E5%A4%A7%E6%98%AF%E4%B8%8D%E6%98%AF%E6%9C%8D%E5%8A%A1%E7%AB%AF%E7%9A%84%E9%97%AE%E9%A2%98" aria-label="sql 延迟比较大是不是服务端的问题 permalink" class="anchor before"><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>SQL 延迟比较大，是不是服务端的问题？</h3><p>例如客户端显示 employee 表的点查比较慢，那么可以按 SQL 文本来模糊查询：</p><pre><code class="hljs language-sql"><div class="MuiBox-root css-1qhimia"><span class="hljs-keyword">SELECT</span> avg_latency, exec_count, query_sample_text <span class="hljs-keyword">FROM</span> information_schema.statements_summary <span class="hljs-keyword">WHERE</span> digest_text <span class="hljs-keyword">LIKE</span> <span class="hljs-string">'select * from employee%'</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>结果如下，<code>avg_latency</code> 是 1 ms 和 0.3 ms，在正常范围，所以可以判定不是服务端的问题，继而排查客户端或网络问题。</p><pre><code class="hljs language-"><div class="MuiBox-root css-1qhimia">+-------------+------------+------------------------------------------+ | avg_latency | exec_count | query_sample_text | +-------------+------------+------------------------------------------+ | 1042040 | 2 | select * from employee where name='eric' | | 345053 | 3 | select * from employee where id=3100 | +-------------+------------+------------------------------------------+ 2 rows in set (0.00 sec) </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><h3 id="哪类-sql-的总耗时最高" style="position:relative"><a href="#%E5%93%AA%E7%B1%BB-sql-%E7%9A%84%E6%80%BB%E8%80%97%E6%97%B6%E6%9C%80%E9%AB%98" aria-label="哪类 sql 的总耗时最高 permalink" class="anchor before"><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>哪类 SQL 的总耗时最高？</h3><p>假如上午 10:00 到 10:30 的 QPS 明显下降，可以从历史表中找出当时耗时最高的三类 SQL：</p><pre><code class="hljs language-sql"><div class="MuiBox-root css-1qhimia"><span class="hljs-keyword">SELECT</span> sum_latency, avg_latency, exec_count, query_sample_text <span class="hljs-keyword">FROM</span> information_schema.statements_summary_history <span class="hljs-keyword">WHERE</span> summary_begin_time<span class="hljs-operator">=</span><span class="hljs-string">'2020-01-02 10:00:00'</span> <span class="hljs-keyword">ORDER</span> <span class="hljs-keyword">BY</span> sum_latency <span class="hljs-keyword">DESC</span> LIMIT <span class="hljs-number">3</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>结果显示以下三类 SQL 的总延迟最高，所以这些 SQL 需要重点优化。</p><pre><code class="hljs language-"><div class="MuiBox-root css-1qhimia">+-------------+-------------+------------+-----------------------------------------------------------------------+ | sum_latency | avg_latency | exec_count | query_sample_text | +-------------+-------------+------------+-----------------------------------------------------------------------+