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style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">数据迁移</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" 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></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" 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-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">数据集成</div></div><svg class="MuiSvgIcon-root 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class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">故障诊断</div></div><style data-emotion="css 171pefp">.css-171pefp{-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:1.5rem;fill:#999999;height:1rem;width:1rem;margin-left:auto;-webkit-transform:rotate(90deg);-moz-transform:rotate(90deg);-ms-transform:rotate(90deg);transform:rotate(90deg);}</style><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-171pefp" 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></div></div><style 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style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">故障场景</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-171pefp" 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></div></div><ul class="MuiCollapse-root MuiCollapse-vertical MuiTreeItem-group MuiCollapse-entered css-1xxsnna" style="min-height:0px" role="group"><div class="MuiCollapse-wrapper MuiCollapse-vertical css-hboir5"><div class="MuiCollapse-wrapperInner MuiCollapse-vertical css-8atqhb"><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="true" id="left-nav-treeview-0-9-1-0" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content 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style="min-height:0px" role="group"><div class="MuiCollapse-wrapper MuiCollapse-vertical css-hboir5"><div class="MuiCollapse-wrapperInner MuiCollapse-vertical css-8atqhb"><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-9-1-0-0" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content Mui-expanded" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><style data-emotion="css 5fc025">.css-5fc025{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-flex-direction:row;-ms-flex-direction:row;flex-direction:row;min-height:1.75rem;-webkit-align-items:center;-webkit-box-align:center;-ms-flex-align:center;align-items:center;padding-left:1.5rem;padding-top:0.25rem;padding-bottom:0.25rem;}</style><div class="css-5fc025"><a aria-current="page" style="text-decoration:none;width:100%;color:inherit" class="" href="/zh/tidb/stable/identify-slow-queries"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">定位慢查询</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-9-1-0-1" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-5fc025"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/analyze-slow-queries"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">分析慢查询</div></div></a></div></div></div></li></div></div></ul></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-9-1-1" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-snygwd"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/troubleshoot-tidb-oom"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">TiDB OOM 故障排查</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-9-1-2" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-snygwd"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/troubleshoot-hot-spot-issues"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">热点问题处理</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-9-1-3" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-snygwd"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/troubleshoot-cpu-issues"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">CPU 占用过多导致读写延迟增加</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-9-1-4" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-snygwd"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/troubleshoot-write-conflicts"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">写冲突与写性能下降</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-9-1-5" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-snygwd"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/troubleshoot-high-disk-io"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">磁盘 I/O 过高</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-9-1-6" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-snygwd"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/troubleshoot-lock-conflicts"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">锁冲突与 TTL 超时</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-9-1-7" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-snygwd"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/troubleshoot-data-inconsistency-errors"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">数据索引不一致报错</div></div></a></div></div></div></li></div></div></ul></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-9-2" tabindex="-1" 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href="/zh/tidb/stable/support"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">获取支持</div></div></a></div></div></div></li></div></div></ul></li><li class="MuiTreeItem-root css-1oy5rnm" 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-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">性能调优</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" 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></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" 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css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">TiDB 工具</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" 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></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" 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-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">参考指南</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" 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></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" 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-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">常见问题解答 (FAQ)</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" 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></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15" tabindex="-1" 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href="/zh/tidb/stable/glossary"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">术语表</div></div></a></div></div></div></li></ul></div></aside><style data-emotion="css sb2sd0">.css-sb2sd0{width:100%;}@media (min-width:1200px){.css-sb2sd0{max-width:calc(100% - 18.75rem);}}</style><main class="MuiBox-root css-sb2sd0"><style data-emotion="css 1rnnmjb">.css-1rnnmjb{max-width:1340px;width:100%;margin-left:auto;margin-right:auto;display:block;box-sizing:border-box;}</style><div class="MuiBox-root 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="慢查询日志" style="position:relative"><a href="#%E6%85%A2%E6%9F%A5%E8%AF%A2%E6%97%A5%E5%BF%97" aria-label="慢查询日志 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>慢查询日志</h1><p>TiDB 会将执行时间超过 <a href="/zh/tidb/stable/system-variables#tidb_slow_log_threshold"><code>tidb_slow_log_threshold</code></a>（默认值为 300 毫秒）的语句输出到 <a href="/zh/tidb/stable/tidb-configuration-file#slow-query-file">slow-query-file</a>（默认值为 "tidb-slow.log"）日志文件中，用于帮助用户定位慢查询语句，分析和解决 SQL 执行的性能问题。</p><p>TiDB 默认启用慢查询日志，可以修改系统变量 <a href="/zh/tidb/stable/system-variables#tidb_enable_slow_log"><code>tidb_enable_slow_log</code></a> 来启用或禁用它。</p><h2 id="日志示例" style="position:relative"><a href="#%E6%97%A5%E5%BF%97%E7%A4%BA%E4%BE%8B" aria-label="日志示例 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>日志示例</h2><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-type">Time</span>: <span class="hljs-number">2019</span><span class="hljs-number">-08</span><span class="hljs-number">-14</span>T09:<span class="hljs-number">26</span>:<span class="hljs-number">59.487776265</span><span class="hljs-operator">+</span><span class="hljs-number">08</span>:<span class="hljs-number">00</span> # Txn_start_ts: <span class="hljs-number">410450924122144769</span> # <span class="hljs-keyword">User</span><span class="hljs-variable">@Host</span>: root[root] @ localhost [<span class="hljs-number">127.0</span><span class="hljs-number">.0</span><span class="hljs-number">.1</span>] # Conn_ID: <span class="hljs-number">3086</span> # Exec_retry_time: <span class="hljs-number">5.1</span> Exec_retry_count: <span class="hljs-number">3</span> # Query_time: <span class="hljs-number">1.527627037</span> # Parse_time: <span class="hljs-number">0.000054933</span> # Compile_time: <span class="hljs-number">0.000129729</span> # Rewrite_time: <span class="hljs-number">0.000000003</span> Preproc_subqueries: <span class="hljs-number">2</span> Preproc_subqueries_time: <span class="hljs-number">0.000000002</span> # Optimize_time: <span class="hljs-number">0.00000001</span> # Wait_TS: <span class="hljs-number">0.00001078</span> # Process_time: <span class="hljs-number">0.07</span> Request_count: <span class="hljs-number">1</span> Total_keys: <span class="hljs-number">131073</span> Process_keys: <span class="hljs-number">131072</span> Prewrite_time: <span class="hljs-number">0.335415029</span> Commit_time: <span class="hljs-number">0.032175429</span> Get_commit_ts_time: <span class="hljs-number">0.000177098</span> Local_latch_wait_time: <span class="hljs-number">0.106869448</span> Write_keys: <span class="hljs-number">131072</span> Write_size: <span class="hljs-number">3538944</span> Prewrite_region: <span class="hljs-number">1</span> # DB: test # Is_internal: <span class="hljs-literal">false</span> # Digest: <span class="hljs-number">50</span>a2e32d2abbd6c1764b1b7f2058d428ef2712b029282b776beb9506a365c0f1 # Stats: t:pseudo # Num_cop_tasks: <span class="hljs-number">1</span> # Cop_proc_avg: <span class="hljs-number">0.07</span> Cop_proc_p90: <span class="hljs-number">0.07</span> Cop_proc_max: <span class="hljs-number">0.07</span> Cop_proc_addr: <span class="hljs-number">172.16</span><span class="hljs-number">.5</span><span class="hljs-number">.87</span>:<span class="hljs-number">20171</span> # Cop_wait_avg: <span class="hljs-number">0</span> Cop_wait_p90: <span class="hljs-number">0</span> Cop_wait_max: <span class="hljs-number">0</span> Cop_wait_addr: <span class="hljs-number">172.16</span><span class="hljs-number">.5</span><span class="hljs-number">.87</span>:<span class="hljs-number">20171</span> # Cop_backoff_regionMiss_total_times: <span class="hljs-number">200</span> Cop_backoff_regionMiss_total_time: <span class="hljs-number">0.2</span> Cop_backoff_regionMiss_max_time: <span class="hljs-number">0.2</span> Cop_backoff_regionMiss_max_addr: <span class="hljs-number">127.0</span><span class="hljs-number">.0</span><span class="hljs-number">.1</span> Cop_backoff_regionMiss_avg_time: <span class="hljs-number">0.2</span> Cop_backoff_regionMiss_p90_time: <span class="hljs-number">0.2</span> # Cop_backoff_rpcPD_total_times: <span class="hljs-number">200</span> Cop_backoff_rpcPD_total_time: <span class="hljs-number">0.2</span> Cop_backoff_rpcPD_max_time: <span class="hljs-number">0.2</span> Cop_backoff_rpcPD_max_addr: <span class="hljs-number">127.0</span><span class="hljs-number">.0</span><span class="hljs-number">.1</span> Cop_backoff_rpcPD_avg_time: <span class="hljs-number">0.2</span> Cop_backoff_rpcPD_p90_time: <span class="hljs-number">0.2</span> # Cop_backoff_rpcTiKV_total_times: <span class="hljs-number">200</span> Cop_backoff_rpcTiKV_total_time: <span class="hljs-number">0.2</span> Cop_backoff_rpcTiKV_max_time: <span class="hljs-number">0.2</span> Cop_backoff_rpcTiKV_max_addr: <span class="hljs-number">127.0</span><span class="hljs-number">.0</span><span class="hljs-number">.1</span> Cop_backoff_rpcTiKV_avg_time: <span class="hljs-number">0.2</span> Cop_backoff_rpcTiKV_p90_time: <span class="hljs-number">0.2</span> # Mem_max: <span class="hljs-number">525211</span> # Disk_max: <span class="hljs-number">65536</span> # Prepared: <span class="hljs-literal">false</span> # Plan_from_cache: <span class="hljs-literal">false</span> # Succ: <span class="hljs-literal">true</span> # Plan: tidb_decode_plan(<span class="hljs-string">'ZJAwCTMyXzcJMAkyMAlkYXRhOlRhYmxlU2Nhbl82CjEJMTBfNgkxAR0AdAEY1Dp0LCByYW5nZTpbLWluZiwraW5mXSwga2VlcCBvcmRlcjpmYWxzZSwgc3RhdHM6cHNldWRvCg=='</span>) use test; <span class="hljs-keyword">insert</span> <span class="hljs-keyword">into</span> t <span class="hljs-keyword">select</span> <span class="hljs-operator">*</span> <span class="hljs-keyword">from</span> t; </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 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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 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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><h2 id="字段含义说明" style="position:relative"><a href="#%E5%AD%97%E6%AE%B5%E5%90%AB%E4%B9%89%E8%AF%B4%E6%98%8E" aria-label="字段含义说明 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>字段含义说明</h2><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 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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>慢查询日志中所有时间相关字段的单位都是 <strong>“秒”</strong></p></div></div></div><p>Slow Query 基础信息：</p><ul><li><code>Time</code>：表示日志打印时间。</li><li><code>Query_time</code>：表示执行这个语句花费的时间。</li><li><code>Parse_time</code>：表示这个语句在语法解析阶段花费的时间。</li><li><code>Compile_time</code>：表示这个语句在查询优化阶段花费的时间。</li><li><code>Optimize_time</code>：表示这个语句在优化查询计划阶段花费的时间。</li><li><code>Wait_TS</code>：表示这个语句在等待获取事务 TS 阶段花费的时间。</li><li><code>Query</code>：表示 SQL 语句。慢日志里面不会打印 <code>Query</code>，但映射到内存表后，对应的字段叫 <code>Query</code>。</li><li><code>Digest</code>：表示 SQL 语句的指纹。</li><li><code>Txn_start_ts</code>：表示事务的开始时间戳，也是事务的唯一 ID，可以用这个值在 TiDB 日志中查找事务相关的其他日志。</li><li><code>Is_internal</code>：表示是否为 TiDB 内部的 SQL 语句。<code>true</code> 表示 TiDB 系统内部执行的 SQL 语句，<code>false</code> 表示用户执行的 SQL 语句。</li><li><code>Index_names</code>：表示这个语句执行用到的索引。</li><li><code>Stats</code>：表示这个语句使用到的统计信息的健康状态、内部版本号、总行数、修改行数以及加载状态。<code>pseudo</code> 状态表示统计信息不健康。如果有尝试使用但没有完全加载的统计信息，会在之后输出其内部状态。例如，<code>t1:439478225786634241[105000;5000][col1:allEvicted][idx1:allEvicted]</code> 的含义如下：<ul><li><code>t1</code>：本次查询优化过程中使用了 <code>t1</code> 表上的统计信息</li><li><code>439478225786634241</code>：其内部版本号</li><li><code>105000</code>：统计信息中维护的总行数</li><li><code>5000</code>：自上次收集统计信息以来记录的修改的行数</li><li><code>col1:allEvicted</code>：<code>col1</code> 列对应的统计信息没有完全加载</li><li><code>idx1:allEvicted</code>：<code>idx1</code> 索引对应的统计信息没有完全加载</li></ul></li><li><code>Succ</code>：表示语句是否执行成功。</li><li><code>Backoff_time</code>：表示语句遇到需要重试的错误时在重试前等待的时间。常见的需要重试的错误有以下几种：遇到了 lock、Region 分裂、<code>tikv server is busy</code>。</li><li><code>Plan</code>：表示语句的执行计划，用 <code>select tidb_decode_plan('xxx...')</code> SQL 语句可以解析出具体的执行计划。</li><li><code>Binary_plan</code>：表示以二进制格式编码后的语句的执行计划，用 <code>select tidb_decode_binary_plan('xxx...')</code> SQL 语句可以解析出具体的执行计划。传递的信息和 <code>Plan</code> 字段基本相同，但是解析出的执行计划的格式会和 <code>Plan</code> 字段不同。</li><li><code>Prepared</code>：表示这个语句是否是 <code>Prepare</code> 或 <code>Execute</code> 的请求。</li><li><code>Plan_from_cache</code>：表示这个语句是否命中了执行计划缓存。</li><li><code>Plan_from_binding</code>：表示这个语句是否用的绑定的执行计划。</li><li><code>Has_more_results</code>：表示这个语句的查询结果是否还有更多的数据待用户发起 <code>fetch</code> 命令获取。</li><li><code>Rewrite_time</code>：表示这个语句在查询改写阶段花费的时间。</li><li><code>Preproc_subqueries</code>：表示这个语句中被提前执行的子查询个数，如 <code>where id in (select if from t)</code> 这个子查询就可能被提前执行。</li><li><code>Preproc_subqueries_time</code>：表示这个语句中被提前执行的子查询耗时。</li><li><code>Exec_retry_count</code>：表示这个语句执行的重试次数。一般出现在悲观事务中，上锁失败时重试执行该语句。</li><li><code>Exec_retry_time</code>：表示这个语句的重试执行时间。例如某个查询一共执行了三次（前两次失败），则 <code>Exec_retry_time</code> 表示前两次的执行时间之和，<code>Query_time</code> 减去 <code>Exec_retry_time</code> 则为最后一次执行时间。</li><li><code>KV_total</code>：表示这个语句在 TiKV/TiFlash 上所有 RPC 请求花费的时间。</li><li><code>PD_total</code>：表示这个语句在 PD 上所有 RPC 请求花费的时间。</li><li><code>Backoff_total</code>：表示这个语句在执行过程中所有 backoff 花费的时间。</li><li><code>Write_sql_response_total</code>：表示这个语句把结果发送回客户端花费的时间。</li><li><code>Result_rows</code>：表示这个语句查询结果的行数。</li><li><code>Warnings</code>：表示这个语句执行过程中产生的警告，采用 JSON 格式。通常和 <a href="/zh/tidb/stable/sql-statement-show-warnings"><code>SHOW WARNINGS</code></a> 语句的输出结果一致，但是可能会包含 <a href="/zh/tidb/stable/sql-statement-show-warnings"><code>SHOW WARNINGS</code></a> 中没有的警告，因而可以提供更多诊断信息。这类警告将被标记为 <code>IsExtra: true</code>。</li><li><code>IsExplicitTxn</code>：表示这个语句是否在一个明确声明的事务中。如果是 <code>false</code>，表示这个语句的事务是 <code>autocommit=1</code>，即语句执行完成后就自动提交的事务。</li></ul><p>和事务执行相关的字段：</p><ul><li><code>Prewrite_time</code>：表示事务两阶段提交中第一阶段（prewrite 阶段）的耗时。</li><li><code>Commit_time</code>：表示事务两阶段提交中第二阶段（commit 阶段）的耗时。</li><li><code>Get_commit_ts_time</code>：表示事务两阶段提交中第二阶段（commit 阶段）获取 commit 时间戳的耗时。</li><li><code>Local_latch_wait_time</code>：表示事务两阶段提交中第二阶段（commit 阶段）发起前在 TiDB 侧等锁的耗时。</li><li><code>Write_keys</code>：表示该事务向 TiKV 的 Write CF 写入 Key 的数量。</li><li><code>Write_size</code>：表示事务提交时写 key 或 value 的总大小。</li><li><code>Prewrite_region</code>：表示事务两阶段提交中第一阶段（prewrite 阶段）涉及的 TiKV Region 数量。每个 Region 会触发一次远程过程调用。</li><li><code>Wait_prewrite_binlog_time</code>：表示事务提交时用于写 binlog 的时间。</li><li><code>Resolve_lock_time</code>：表示事务提交时遇到锁后，清理锁或者等待锁过期的时间。</li></ul><p>和内存使用相关的字段：</p><ul><li><code>Mem_max</code>：表示执行期间 TiDB 使用的最大内存空间，单位为 byte。</li></ul><p>和硬盘使用相关的字段：</p><ul><li><code>Disk_max</code>：表示执行期间 TiDB 使用的最大硬盘空间，单位为 byte。</li></ul><p>和 SQL 执行的用户相关的字段：</p><ul><li><code>User</code>：表示执行语句的用户名。</li><li><code>Host</code>：表示执行语句的用户地址。</li><li><code>Conn_ID</code>：表示用户的链接 ID，可以用类似 <code>con:3</code> 的关键字在 TiDB 日志中查找该链接相关的其他日志。</li><li><code>DB</code>：表示执行语句时使用的 database。</li></ul><p>和 TiKV Coprocessor Task 相关的字段：</p><ul><li><code>Request_count</code>：表示这个语句发送的 Coprocessor 请求的数量。</li><li><code>Total_keys</code>：表示 Coprocessor 扫过的 key 的数量。</li><li><code>Process_time</code>：执行 SQL 在 TiKV 的处理时间之和，因为数据会并行的发到 TiKV 执行，这个值可能会超过 <code>Query_time</code>。</li><li><code>Wait_time</code>：表示这个语句在 TiKV 的等待时间之和，因为 TiKV 的 Coprocessor 线程数是有限的，当所有的 Coprocessor 线程都在工作的时候，请求会排队；当队列中有某些请求耗时很长的时候，后面的请求的等待时间都会增加。</li><li><code>Process_keys</code>：表示 Coprocessor 处理的 key 的数量。相比 total_keys，processed_keys 不包含 MVCC 的旧版本。如果 processed_keys 和 total_keys 相差很大，说明旧版本比较多。</li><li><code>Num_cop_tasks</code>：表示这个语句发送的 Coprocessor 请求的数量。</li><li><code>Cop_proc_avg</code>：cop-task 的平均执行时间，包括一些无法统计的等待时间，如 RocksDB 内的 mutex。</li><li><code>Cop_proc_p90</code>：cop-task 的 P90 分位执行时间。</li><li><code>Cop_proc_max</code>：cop-task 的最大执行时间。</li><li><code>Cop_proc_addr</code>：执行时间最长的 cop-task 所在地址。</li><li><code>Cop_wait_avg</code>：cop-task 的平均等待时间，包括请求排队和获取 snapshot 时间。</li><li><code>Cop_wait_p90</code>：cop-task 的 P90 分位等待时间。</li><li><code>Cop_wait_max</code>：cop-task 的最大等待时间。</li><li><code>Cop_wait_addr</code>：等待时间最长的 cop-task 所在地址。</li><li><code>Rocksdb_delete_skipped_count</code>：RocksDB 读数据过程中已删除 Key 的扫描数。</li><li><code>Rocksdb_key_skipped_count</code>：RocksDB 扫数据时遇到的已删除 (tombstone) Key 数量。</li><li><code>Rocksdb_block_cache_hit_count</code>：RocksDB 从 Block Cache 缓存中读数据的次数。</li><li><code>Rocksdb_block_read_count</code>：RocksDB 从文件系统中读数据的次数。</li><li><code>Rocksdb_block_read_byte</code>：RocksDB 从文件系统中读数据的数据量。</li><li><code>Rocksdb_block_read_time</code>：RocksDB 从文件系统中读数据的时间。</li><li><code>Cop_backoff_{backoff-type}_total_times</code>：因某种错误造成的 backoff 总次数。</li><li><code>Cop_backoff_{backoff-type}_total_time</code>：因某种错误造成的 backoff 总时间。</li><li><code>Cop_backoff_{backoff-type}_max_time</code>：因某种错误造成的最大 backoff 时间。</li><li><code>Cop_backoff_{backoff-type}_max_addr</code>：因某种错误造成的最大 backoff 时间的 cop-task 地址。</li><li><code>Cop_backoff_{backoff-type}_avg_time</code>：因某种错误造成的平均 backoff 时间。</li><li><code>Cop_backoff_{backoff-type}_p90_time</code>：因某种错误造成的 P90 分位 backoff 时间。</li></ul><p><code>backoff-type</code> 一般有以下几种：</p><ul><li><code>tikvRPC</code>：给 TiKV 发送 RPC 请求失败而产生的 backoff。</li><li><code>tiflashRPC</code>：给 TiFlash 发送 RPC 请求失败而产生的 backoff。</li><li><code>pdRPC</code>：给 PD 发送 RPC 请求失败而产生的 backoff。</li><li><code>txnLock</code>：遇到锁冲突后产生的 backoff。</li><li><code>regionMiss</code>：Region 发生分裂或者合并后，TiDB 的 Region 缓存信息过期导致请求失败而产生的 backoff。</li><li><code>regionScheduling</code>：Region 还在调度中，尚未选出 Leader 导致无法处理请求而产生的 backoff。</li><li><code>tikvServerBusy</code>：因为 TiKV 负载太高无法处理新请求而产生的 backoff。</li><li><code>tiflashServerBusy</code>：因为 TiFlash 负载太高无法处理新请求而产生的 backoff。</li><li><code>tikvDiskFull</code>：因为 TiKV 的磁盘满了而产生的 backoff。</li><li><code>txnLockFast</code>：因为读数据时遇到了锁而产生的 backoff。</li></ul><p>和资源管控相关的字段：</p><ul><li><code>Resource_group</code>：语句执行所绑定的资源组。</li><li><code>Request_unit_read</code>：执行语句消耗的总读 RU。</li><li><code>Request_unit_write</code>：执行语句消耗的总写 RU。</li><li><code>Time_queued_by_rc</code>：执行语句过程中等待可用资源的总耗时。</li></ul><h2 id="相关系统变量" style="position:relative"><a href="#%E7%9B%B8%E5%85%B3%E7%B3%BB%E7%BB%9F%E5%8F%98%E9%87%8F" aria-label="相关系统变量 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>相关系统变量</h2><ul><li><a href="/zh/tidb/stable/system-variables#tidb_slow_log_threshold">tidb_slow_log_threshold</a>：设置慢日志的阈值，执行时间超过阈值的 SQL 语句将被记录到慢日志中。默认值是 300 ms。</li><li><a href="/zh/tidb/stable/system-variables#tidb_query_log_max_len">tidb_query_log_max_len</a>：设置慢日志记录 SQL 语句的最大长度。默认值是 4096 byte。</li><li><a href="/zh/tidb/stable/system-variables#tidb_redact_log">tidb_redact_log</a>：设置慢日志记录 SQL 时是否将用户数据脱敏用 <code>?</code> 代替。默认值是 <code>0</code>，即关闭该功能。</li><li><a href="/zh/tidb/stable/system-variables#tidb_enable_collect_execution_info">tidb_enable_collect_execution_info</a>：设置是否记录执行计划中各个算子的物理执行信息，默认值是 <code>1</code>。该功能对性能的影响约为 3%。开启该项后查看 <code>Plan</code> 的示例如下：</li></ul><pre><code class="hljs language-sql"><div class="MuiBox-root css-1qhimia"><span class="hljs-operator">&gt;</span> <span class="hljs-keyword">select</span> tidb_decode_plan(<span class="hljs-string">'jAOIMAk1XzE3CTAJMQlmdW5jczpjb3VudChDb2x1bW4jNyktPkMJC/BMNQkxCXRpbWU6MTAuOTMxNTA1bXMsIGxvb3BzOjIJMzcyIEJ5dGVzCU4vQQoxCTMyXzE4CTAJMQlpbmRleDpTdHJlYW1BZ2dfOQkxCXQRSAwyNzY4LkgALCwgcnBjIG51bTogMQkMEXMQODg0MzUFK0hwcm9jIGtleXM6MjUwMDcJMjA2HXsIMgk1BWM2zwAAMRnIADcVyAAxHcEQNQlOL0EBBPBbCjMJMTNfMTYJMQkzMTI4MS44NTc4MTk5MDUyMTcJdGFibGU6dCwgaW5kZXg6aWR4KGEpLCByYW5nZTpbLWluZiw1MDAwMCksIGtlZXAgb3JkZXI6ZmFsc2UJMjUBrgnQVnsA'</span>); <span class="hljs-operator">+</span><span class="hljs-comment">------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+</span> <span class="hljs-operator">|</span> tidb_decode_plan(<span class="hljs-string">'jAOIMAk1XzE3CTAJMQlmdW5jczpjb3VudChDb2x1bW4jNyktPkMJC/BMNQkxCXRpbWU6MTAuOTMxNTA1bXMsIGxvb3BzOjIJMzcyIEJ5dGVzCU4vQQoxCTMyXzE4CTAJMQlpbmRleDpTdHJlYW1BZ2dfOQkxCXQRSAwyNzY4LkgALCwgcnBjIG51bTogMQkMEXMQODg0MzUFK0hwcm9jIGtleXM6MjUwMDcJMjA2HXsIMg | +------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | id task estRows operator info actRows execution info memory disk | | StreamAgg_17 root 1 funcs:count(Column#7)-&gt;Column#5 1 time:10.931505ms, loops:2 372 Bytes N/A | | └─IndexReader_18 root 1 index:StreamAgg_9 1 time:10.927685ms, loops:2, rpc num: 1, rpc time:10.884355ms, proc keys:25007 206 Bytes N/A | | └─StreamAgg_9 cop 1 funcs:count(1)-&gt;Column#7 1 time:11ms, loops:25 N/A N/A | | └─IndexScan_16 cop 31281.857819905217 table:t, index:idx(a), range:[-inf,50000), keep order:false 25007 time:11ms, loops:25 N/A N/A | +------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ </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>在性能测试中可以关闭自动收集算子的执行信息：</p><pre><code class="hljs language-sql"><div class="MuiBox-root css-1qhimia"><span class="hljs-keyword">set</span> @<span class="hljs-variable">@tidb</span>_enable_collect_execution_info<span class="hljs-operator">=</span><span class="hljs-number">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><code>Plan</code> 字段显示的格式和 <a href="/zh/tidb/stable/sql-statement-explain"><code>EXPLAIN</code></a> 或者 <a href="/zh/tidb/stable/sql-statement-explain-analyze"><code>EXPLAIN ANALYZE</code></a> 大致一致。可以查看 <a href="/zh/tidb/stable/sql-statement-explain"><code>EXPLAIN</code></a> 或者 <a href="/zh/tidb/stable/sql-statement-explain-analyze"><code>EXPLAIN ANALYZE</code></a> 文档了解更多关于执行计划的信息。</p><p>更多详细信息，可以参见 <a href="/zh/tidb/stable/system-variables">TiDB 专用系统变量和语法</a>。</p><h2 id="慢日志内存映射表" style="position:relative"><a href="#%E6%85%A2%E6%97%A5%E5%BF%97%E5%86%85%E5%AD%98%E6%98%A0%E5%B0%84%E8%A1%A8" aria-label="慢日志内存映射表 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>慢日志内存映射表</h2><p>用户可通过查询 <code>INFORMATION_SCHEMA.SLOW_QUERY</code> 表来查询慢查询日志中的内容，表中列名和慢日志中字段名一一对应，表结构可查看 <a href="/zh/tidb/stable/information-schema-slow-query"><code>SLOW_QUERY</code> 表</a>中的介绍。</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><p>每次查询 <code>SLOW_QUERY</code> 表时，TiDB 都会去读取和解析一次当前的慢查询日志。</p></div></div></div><p>TiDB 4.0 中，<code>SLOW_QUERY</code> 已经支持查询任意时间段的慢日志，即支持查询已经被 rotate 的慢日志文件的数据。用户查询时只需要指定 <code>TIME</code> 时间范围即可定位需要解析的慢日志文件。如果查询不指定时间范围，则仍然只解析当前的慢日志文件，示例如下：</p><p>不指定时间范围时，只会解析当前 TiDB 正在写入的慢日志文件的慢查询数据：</p><pre><code class="hljs language-sql"><div class="MuiBox-root css-1qhimia"><span class="hljs-keyword">select</span> <span class="hljs-built_in">count</span>(<span class="hljs-operator">*</span>), <span class="hljs-built_in">min</span>(<span class="hljs-type">time</span>), <span class="hljs-built_in">max</span>(<span class="hljs-type">time</span>) <span class="hljs-keyword">from</span> slow_query; </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">+----------+----------------------------+----------------------------+ | count(*) | min(time) | max(time) | +----------+----------------------------+----------------------------+ | 122492 | 2020-03-11 23:35:20.908574 | 2020-03-25 19:16:38.229035 | +----------+----------------------------+----------------------------+ </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>指定查询 <code>2020-03-10 00:00:00</code> 到 <code>2020-03-11 00:00:00</code> 时间范围后，会定位指定时间范围内的慢日志文件后解析慢查询数据：</p><pre><code class="hljs language-sql"><div class="MuiBox-root css-1qhimia"><span class="hljs-keyword">select</span> <span class="hljs-built_in">count</span>(<span class="hljs-operator">*</span>), <span class="hljs-built_in">min</span>(<span class="hljs-type">time</span>), <span class="hljs-built_in">max</span>(<span class="hljs-type">time</span>) <span class="hljs-keyword">from</span> slow_query <span class="hljs-keyword">where</span> <span class="hljs-type">time</span> <span class="hljs-operator">&gt;</span> <span class="hljs-string">'2020-03-10 00:00:00'</span> <span class="hljs-keyword">and</span> <span class="hljs-type">time</span> <span class="hljs-operator">&lt;</span> <span class="hljs-string">'2020-03-11 00:00:00'</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><pre><code class="hljs language-"><div class="MuiBox-root css-1qhimia">+----------+----------------------------+----------------------------+ | count(*) | min(time) | max(time) | +----------+----------------------------+----------------------------+ | 2618049 | 2020-03-10 00:00:00.427138 | 2020-03-10 23:00:22.716728 | +----------+----------------------------+----------------------------+ </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><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>如果指定时间范围内的慢日志文件被删除，或者并没有慢查询，则查询结果会返回空。</p></div></div></div><p>TiDB 4.0 中新增了 <a href="/zh/tidb/stable/information-schema-slow-query#cluster_slow_query-table"><code>CLUSTER_SLOW_QUERY</code></a> 系统表，用来查询所有 TiDB 节点的慢查询信息，表结构在 <code>SLOW_QUERY</code> 的基础上多增加了 <code>INSTANCE</code> 列，表示该行慢查询信息来自的 TiDB 节点地址。使用方式和 <a href="/zh/tidb/stable/information-schema-slow-query"><code>SLOW_QUERY</code></a> 系统表一样。</p><p>关于查询 <code>CLUSTER_SLOW_QUERY</code> 表，TiDB 会把相关的计算和判断下推到其他节点执行，而不是把其他节点的慢查询数据都取回来在一台 TiDB 上执行。</p><h2 id="查询-slow_querycluster_slow_query-示例" style="position:relative"><a href="#%E6%9F%A5%E8%AF%A2-slow_querycluster_slow_query-%E7%A4%BA%E4%BE%8B" aria-label="查询 slow_querycluster_slow_query 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>查询 <code>SLOW_QUERY</code>/<code>CLUSTER_SLOW_QUERY</code> 示例</h2><h3 id="搜索-top-n-的慢查询" style="position:relative"><a href="#%E6%90%9C%E7%B4%A2-top-n-%E7%9A%84%E6%85%A2%E6%9F%A5%E8%AF%A2" aria-label="搜索 top n 的慢查询 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>搜索 Top N 的慢查询</h3><p>查询 Top 2 的用户慢查询。<code>is_internal=false</code> 表示排除 TiDB 内部的慢查询，只看用户的慢查询：</p><pre><code class="hljs language-sql"><div class="MuiBox-root css-1qhimia"><span class="hljs-keyword">select</span> query_time, query <span class="hljs-keyword">from</span> information_schema.slow_query <span class="hljs-keyword">where</span> is_internal <span class="hljs-operator">=</span> <span class="hljs-literal">false</span> <span class="hljs-comment">-- 排除 TiDB 内部的慢查询 SQL</span> <span class="hljs-keyword">order</span> <span class="hljs-keyword">by</span> query_time <span class="hljs-keyword">desc</span> limit <span class="hljs-number">2</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>输出样例：</p><pre><code class="hljs language-"><div class="MuiBox-root css-1qhimia">+--------------+------------------------------------------------------------------+ | query_time | query | +--------------+------------------------------------------------------------------+ | 12.77583857 | select * from t_slim, t_wide where t_slim.c0=t_wide.c0; | | 0.734982725 | select t0.c0, t1.c1 from t_slim t0, t_wide t1 where t0.c0=t1.c0; | +--------------+------------------------------------------------------------------+ </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="搜索某个用户的-top-n-慢查询" style="position:relative"><a href="#%E6%90%9C%E7%B4%A2%E6%9F%90%E4%B8%AA%E7%94%A8%E6%88%B7%E7%9A%84-top-n-%E6%85%A2%E6%9F%A5%E8%AF%A2" aria-label="搜索某个用户的 top n 慢查询 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>搜索某个用户的 Top N 慢查询</h3><p>下面例子中搜索 test 用户执行的慢查询 SQL，且按执行消耗时间逆序排序显式前 2 条：</p><pre><code class="hljs language-sql"><div class="MuiBox-root css-1qhimia"><span class="hljs-keyword">select</span> query_time, query, <span class="hljs-keyword">user</span> <span class="hljs-keyword">from</span> information_schema.slow_query <span class="hljs-keyword">where</span> is_internal <span class="hljs-operator">=</span> <span class="hljs-literal">false</span> <span class="hljs-comment">-- 排除 TiDB 内部的慢查询 SQL</span> <span class="hljs-keyword">and</span> <span class="hljs-keyword">user</span> <span class="hljs-operator">=</span> "test" <span class="hljs-comment">-- 查找的用户名</span> <span class="hljs-keyword">order</span> <span class="hljs-keyword">by</span> query_time <span class="hljs-keyword">desc</span> limit <span class="hljs-number">2</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>输出样例：</p><pre><code class="hljs language-"><div class="MuiBox-root css-1qhimia">+-------------+------------------------------------------------------------------+----------------+ | Query_time | query | user | +-------------+------------------------------------------------------------------+----------------+ | 0.676408014 | select t0.c0, t1.c1 from t_slim t0, t_wide t1 where t0.c0=t1.c1; | test | +-------------+------------------------------------------------------------------+----------------+ </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="根据-sql-指纹搜索同类慢查询" style="position:relative"><a href="#%E6%A0%B9%E6%8D%AE-sql-%E6%8C%87%E7%BA%B9%E6%90%9C%E7%B4%A2%E5%90%8C%E7%B1%BB%E6%85%A2%E6%9F%A5%E8%AF%A2" aria-label="根据 sql 指纹搜索同类慢查询 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>根据 SQL 指纹搜索同类慢查询</h3><p>在得到 Top N 的慢查询 SQL 后，可通过 SQL 指纹继续搜索同类慢查询 SQL。</p><p>先获取 Top N 的慢查询和对应的 SQL 指纹：</p><pre><code class="hljs language-sql"><div class="MuiBox-root css-1qhimia"><span class="hljs-keyword">select</span> query_time, query, digest <span class="hljs-keyword">from</span> information_schema.slow_query <span class="hljs-keyword">where</span> is_internal <span class="hljs-operator">=</span> <span class="hljs-literal">false</span> <span class="hljs-keyword">order</span> <span class="hljs-keyword">by</span> query_time <span class="hljs-keyword">desc</span> limit <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>输出样例：</p><pre><code class="hljs language-"><div class="MuiBox-root css-1qhimia">+-------------+-----------------------------+------------------------------------------------------------------+ | query_time | query | digest | +-------------+-----------------------------+------------------------------------------------------------------+ | 0.302558006 | select * from t1 where a=1; | 4751cb6008fda383e22dacb601fde85425dc8f8cf669338d55d944bafb46a6fa | +-------------+-----------------------------+------------------------------------------------------------------+ </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>再根据 SQL 指纹搜索同类慢查询：</p><pre><code class="hljs language-sql"><div class="MuiBox-root css-1qhimia"><span class="hljs-keyword">select</span> query, query_time <span class="hljs-keyword">from</span> information_schema.slow_query <span class="hljs-keyword">where</span> digest <span class="hljs-operator">=</span> "4751cb6008fda383e22dacb601fde85425dc8f8cf669338d55d944bafb46a6fa"; </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>输出样例：</p><pre><code class="hljs language-"><div class="MuiBox-root css-1qhimia">+-----------------------------+-------------+ | query | query_time | +-----------------------------+-------------+ | select * from t1 where a=1; | 0.302558006 | | select * from t1 where a=2; | 0.401313532 | +-----------------------------+-------------+ </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="搜索统计信息为-pseudo-的慢查询-sql-语句" style="position:relative"><a href="#%E6%90%9C%E7%B4%A2%E7%BB%9F%E8%AE%A1%E4%BF%A1%E6%81%AF%E4%B8%BA-pseudo-%E7%9A%84%E6%85%A2%E6%9F%A5%E8%AF%A2-sql-%E8%AF%AD%E5%8F%A5" aria-label="搜索统计信息为 pseudo 的慢查询 sql 语句 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>搜索统计信息为 pseudo 的慢查询 SQL 语句</h3><pre><code class="hljs language-sql"><div class="MuiBox-root css-1qhimia"><span class="hljs-keyword">select</span> query, query_time, stats <span class="hljs-keyword">from</span> information_schema.slow_query <span class="hljs-keyword">where</span> is_internal <span class="hljs-operator">=</span> <span class="hljs-literal">false</span> <span class="hljs-keyword">and</span> stats <span class="hljs-keyword">like</span> <span class="hljs-string">'%pseudo%'</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>输出样例：</p><pre><code class="hljs language-"><div class="MuiBox-root css-1qhimia">+-----------------------------+-------------+---------------------------------+ | query | query_time | stats | +-----------------------------+-------------+---------------------------------+ | select * from t1 where a=1; | 0.302558006 | t1:pseudo | | select * from t1 where a=2; | 0.401313532 | t1:pseudo | | select * from t1 where a&gt;2; | 0.602011247 | t1:pseudo | | select * from t1 where a&gt;3; | 0.50077719 | t1:pseudo | | select * from t1 join t2; | 0.931260518 | t1:407872303825682445,t2:pseudo | +-----------------------------+-------------+---------------------------------+ </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="查询执行计划发生变化的慢查询" style="position:relative"><a href="#%E6%9F%A5%E8%AF%A2%E6%89%A7%E8%A1%8C%E8%AE%A1%E5%88%92%E5%8F%91%E7%94%9F%E5%8F%98%E5%8C%96%E7%9A%84%E6%85%A2%E6%9F%A5%E8%AF%A2" aria-label="查询执行计划发生变化的慢查询 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>查询执行计划发生变化的慢查询</h3><p>由于统计信息过时，或者统计信息因为误差无法精确反映数据的真实分布情况时，可能导致同类型 SQL 的执行计划发生改变导致执行变慢，可以用以下 SQL 查询哪些 SQL 具有不同的执行计划：</p><pre><code class="hljs language-sql"><div class="MuiBox-root css-1qhimia"><span class="hljs-keyword">select</span> <span class="hljs-built_in">count</span>(<span class="hljs-keyword">distinct</span> plan_digest) <span class="hljs-keyword">as</span> count, digest, <span class="hljs-built_in">min</span>(query) <span class="hljs-keyword">from</span> cluster_slow_query <span class="hljs-keyword">group</span> <span class="hljs-keyword">by</span> digest <span class="hljs-keyword">having</span> count <span class="hljs-operator">&gt;</span> <span class="hljs-number">1</span> limit <span class="hljs-number">3</span>\G </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>输出样例：</p><pre><code class="hljs language-"><div class="MuiBox-root css-1qhimia">***************************[ 1. row ]*************************** count | 2 digest | 17b4518fde82e32021877878bec2bb309619d384fca944106fcaf9c93b536e94 min(query) | SELECT DISTINCT c FROM sbtest25 WHERE id BETWEEN ? AND ? ORDER BY c [arguments: (291638, 291737)]; ***************************[ 2. row ]*************************** count | 2 digest | 9337865f3e2ee71c1c2e740e773b6dd85f23ad00f8fa1f11a795e62e15fc9b23 min(query) | SELECT DISTINCT c FROM sbtest22 WHERE id BETWEEN ? AND ? ORDER BY c [arguments: (215420, 215519)]; ***************************[ 3. row ]*************************** count | 2 digest | db705c89ca2dfc1d39d10e0f30f285cbbadec7e24da4f15af461b148d8ffb020 min(query) | SELECT DISTINCT c FROM sbtest11 WHERE id BETWEEN ? AND ? ORDER BY c [arguments: (303359, 303458)]; </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>然后可以用查询结果中的 SQL 指纹进一步查询不同的 plan</p><pre><code class="hljs language-sql"><div class="MuiBox-root css-1qhimia"><span class="hljs-keyword">select</span> <span class="hljs-built_in">min</span>(plan), plan_digest <span class="hljs-keyword">from</span> cluster_slow_query <span class="hljs-keyword">where</span> digest<span class="hljs-operator">=</span><span class="hljs-string">'17b4518fde82e32021877878bec2bb309619d384fca944106fcaf9c93b536e94'</span> <span class="hljs-keyword">group</span> <span class="hljs-keyword">by</span> plan_digest\G </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>输出样例：</p><pre><code class="hljs language-"><div class="MuiBox-root css-1qhimia">*************************** 1. row *************************** min(plan): Sort_6 root 100.00131380758702 sbtest.sbtest25.c:asc └─HashAgg_10 root 100.00131380758702 group by:sbtest.sbtest25.c, funcs:firstrow(sbtest.sbtest25.c)-&gt;sbtest.sbtest25.c └─TableReader_15 root 100.00131380758702 data:TableRangeScan_14 └─TableScan_14 cop 100.00131380758702 table:sbtest25, range:[502791,502890], keep order:false plan_digest: 6afbbd21f60ca6c6fdf3d3cd94f7c7a49dd93c00fcf8774646da492e50e204ee *************************** 2. row *************************** min(plan): Sort_6 root 1 sbtest.sbtest25.c:asc └─HashAgg_12 root 1 group by:sbtest.sbtest25.c, funcs:firstrow(sbtest.sbtest25.c)-&gt;sbtest.sbtest25.c └─TableReader_13 root 1 data:HashAgg_8 └─HashAgg_8 cop 1 group by:sbtest.sbtest25.c, └─TableScan_11 cop 1.2440069558121831 table:sbtest25, range:[472745,472844], keep order:false </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="查询集群各个-tidb-节点的慢查询数量" style="position:relative"><a href="#%E6%9F%A5%E8%AF%A2%E9%9B%86%E7%BE%A4%E5%90%84%E4%B8%AA-tidb-%E8%8A%82%E7%82%B9%E7%9A%84%E6%85%A2%E6%9F%A5%E8%AF%A2%E6%95%B0%E9%87%8F" aria-label="查询集群各个 tidb 节点的慢查询数量 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>查询集群各个 TIDB 节点的慢查询数量</h3><pre><code class="hljs language-sql"><div class="MuiBox-root css-1qhimia"><span class="hljs-keyword">select</span> instance, <span class="hljs-built_in">count</span>(<span class="hljs-operator">*</span>) <span class="hljs-keyword">from</span> information_schema.cluster_slow_query <span class="hljs-keyword">where</span> <span class="hljs-type">time</span> <span class="hljs-operator">&gt;=</span> "2020-03-06 00:00:00" <span class="hljs-keyword">and</span> <span class="hljs-type">time</span> <span class="hljs-operator">&lt;</span> now() <span class="hljs-keyword">group</span> <span class="hljs-keyword">by</span> instance; </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>输出样例：</p><pre><code class="hljs language-"><div class="MuiBox-root css-1qhimia">+---------------+----------+ | instance | count(*) | +---------------+----------+ | 0.0.0.0:10081 | 124 | | 0.0.0.0:10080 | 119771 | +---------------+----------+ </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="查询仅出现在异常时间段的慢日志" style="position:relative"><a href="#%E6%9F%A5%E8%AF%A2%E4%BB%85%E5%87%BA%E7%8E%B0%E5%9C%A8%E5%BC%82%E5%B8%B8%E6%97%B6%E9%97%B4%E6%AE%B5%E7%9A%84%E6%85%A2%E6%97%A5%E5%BF%97" aria-label="查询仅出现在异常时间段的慢日志 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>查询仅出现在异常时间段的慢日志</h3><p>假如发现 <code>2020-03-10 13:24:00</code> ~ <code>2020-03-10 13:27:00</code> 的 QPS 降低或者延迟上升等问题，可能是由于突然出现大查询导致的，可以用下面 SQL 查询仅出现在异常时间段的慢日志，其中 <code>2020-03-10 13:20:00</code> ~ <code>2020-03-10 13:23:00</code> 为正常时间段。</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> (<span class="hljs-keyword">SELECT</span> <span class="hljs-comment">/*+ AGG_TO_COP(), HASH_AGG() */</span> <span class="hljs-built_in">count</span>(<span class="hljs-operator">*</span>), <span class="hljs-built_in">min</span>(<span class="hljs-type">time</span>), <span class="hljs-built_in">sum</span>(query_time) <span class="hljs-keyword">AS</span> sum_query_time, <span class="hljs-built_in">sum</span>(Process_time) <span class="hljs-keyword">AS</span> sum_process_time, <span class="hljs-built_in">sum</span>(Wait_time) <span class="hljs-keyword">AS</span> sum_wait_time, <span class="hljs-built_in">sum</span>(Commit_time), <span class="hljs-built_in">sum</span>(Request_count), <span class="hljs-built_in">sum</span>(process_keys), <span class="hljs-built_in">sum</span>(Write_keys), <span class="hljs-built_in">max</span>(Cop_proc_max), <span class="hljs-built_in">min</span>(query),<span class="hljs-built_in">min</span>(prev_stmt), digest <span class="hljs-keyword">FROM</span> information_schema.CLUSTER_SLOW_QUERY <span class="hljs-keyword">WHERE</span> <span class="hljs-type">time</span> <span class="hljs-operator">&gt;=</span> <span class="hljs-string">'2020-03-10 13:24:00'</span> <span class="hljs-keyword">AND</span> <span class="hljs-type">time</span> <span class="hljs-operator">&lt;</span> <span class="hljs-string">'2020-03-10 13:27:00'</span> <span class="hljs-keyword">AND</span> Is_internal <span class="hljs-operator">=</span> <span class="hljs-literal">false</span> <span class="hljs-keyword">GROUP</span> <span class="hljs-keyword">BY</span> digest) <span class="hljs-keyword">AS</span> t1 <span class="hljs-keyword">WHERE</span> t1.digest <span class="hljs-keyword">NOT</span> <span class="hljs-keyword">IN</span> (<span class="hljs-keyword">SELECT</span> <span class="hljs-comment">/*+ AGG_TO_COP(), HASH_AGG() */</span> digest <span class="hljs-keyword">FROM</span> information_schema.CLUSTER_SLOW_QUERY <span class="hljs-keyword">WHERE</span> <span class="hljs-type">time</span> <span class="hljs-operator">&gt;=</span> <span class="hljs-string">'2020-03-10 13:20:00'</span> <span class="hljs-keyword">AND</span> <span class="hljs-type">time</span> <span class="hljs-operator">&lt;</span> <span class="hljs-string">'2020-03-10 13:23:00'</span> <span class="hljs-keyword">GROUP</span> <span class="hljs-keyword">BY</span> digest) <span class="hljs-keyword">ORDER</span> <span class="hljs-keyword">BY</span> t1.sum_query_time <span class="hljs-keyword">DESC</span> limit <span class="hljs-number">10</span>\G </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>输出样例：</p><pre><code class="hljs language-"><div class="MuiBox-root css-1qhimia">***************************[ 1. row ]*************************** count(*) | 200 min(time) | 2020-03-10 13:24:27.216186 sum_query_time | 50.114126194 sum_process_time | 268.351 sum_wait_time | 8.476 sum(Commit_time) | 1.044304306 sum(Request_count) | 6077 sum(process_keys) | 202871950 sum(Write_keys) | 319500 max(Cop_proc_max) | 0.263 min(query) | delete from test.tcs2 limit 5000; min(prev_stmt) | digest | 24bd6d8a9b238086c9b8c3d240ad4ef32f79ce94cf5a468c0b8fe1eb5f8d03df </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><h2 id="解析其他的-tidb-慢日志文件" style="position:relative"><a href="#%E8%A7%A3%E6%9E%90%E5%85%B6%E4%BB%96%E7%9A%84-tidb-%E6%85%A2%E6%97%A5%E5%BF%97%E6%96%87%E4%BB%B6" aria-label="解析其他的 tidb 慢日志文件 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>解析其他的 TiDB 慢日志文件</h2><p>TiDB 通过 session 变量 <code>tidb_slow_query_file</code> 控制查询 <code>INFORMATION_SCHEMA.SLOW_QUERY</code> 时要读取和解析的文件，可通过修改改 session 变量的值来查询其他慢查询日志文件的内容：</p><pre><code class="hljs language-sql"><div class="MuiBox-root css-1qhimia"><span class="hljs-keyword">set</span> tidb_slow_query_file <span class="hljs-operator">=</span> "/path-to-log/tidb-slow.log" </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><h2 id="用-pt-query-digest-工具分析-tidb-慢日志" style="position:relative"><a href="#%E7%94%A8-pt-query-digest-%E5%B7%A5%E5%85%B7%E5%88%86%E6%9E%90-tidb-%E6%85%A2%E6%97%A5%E5%BF%97" aria-label="用 pt query digest 工具分析 tidb 慢日志 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>用 <code>pt-query-digest</code> 工具分析 TiDB 慢日志</h2><p>可以用 <code>pt-query-digest</code> 工具分析 TiDB 慢日志。</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><p>建议使用 pt-query-digest 3.0.13 及以上版本。</p></div></div></div><p>示例如下：</p><pre><code class="hljs language-sh"><div class="MuiBox-root css-1qhimia">pt-query-digest --report tidb-slow.log </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>输出样例：</p><pre><code class="hljs language-"><div class="MuiBox-root css-1qhimia"># 320ms user time, 20ms system time, 27.00M rss, 221.32M vsz # Current date: Mon Mar 18 13:18:51 2019 # Hostname: localhost.localdomain # Files: tidb-slow.log # Overall: 1.02k total, 21 unique, 0 QPS, 0x concurrency _________________ # Time range: 2019-03-18-12:22:16 to 2019-03-18-13:08:52 # Attribute total min max avg 95% stddev median # ============ ======= ======= ======= ======= ======= ======= ======= # Exec time 218s 10ms 13s 213ms 30ms 1s 19ms # Query size 175.37k 9 2.01k 175.89 158.58 122.36 158.58 # Commit time 46ms 2ms 7ms 3ms 7ms 1ms 3ms # Conn ID 71 1 16 8.88 15.25 4.06 9.83 # Process keys 581.87k 2 103.15k 596.43 400.73 3.91k 400.73 # Process time 31s 1ms 10s 32ms 19ms 334ms 16ms # Request coun 1.97k 1 10 2.02 1.96 0.33 1.96 # Total keys 636.43k 2 103.16k 652.35 793.42 3.97k 400.73 # Txn start ts 374.38E 0 16.00E 375.48P 1.25P 89.05T 1.25P # Wait time 943ms 1ms 19ms 1ms 2ms 1ms 972us </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="定位问题语句的方法" style="position:relative"><a href="#%E5%AE%9A%E4%BD%8D%E9%97%AE%E9%A2%98%E8%AF%AD%E5%8F%A5%E7%9A%84%E6%96%B9%E6%B3%95" aria-label="定位问题语句的方法 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>定位问题语句的方法</h3><p>并不是所有 SLOW_QUERY 的语句都是有问题的。会造成集群整体压力增大的，是那些 process_time 很大的语句。wait_time 很大，但 process_time 很小的语句通常不是问题语句，是因为被问题语句阻塞，在执行队列等待造成的响应时间过长。</p><h2 id="admin-show-slow-命令" style="position:relative"><a href="#admin-show-slow-%E5%91%BD%E4%BB%A4" aria-label="admin show slow 命令 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>ADMIN SHOW SLOW</code> 命令</h2><p>除了获取 TiDB 日志，还有一种定位慢查询的方式是通过 <code>ADMIN SHOW SLOW</code> SQL 命令：</p><pre><code class="hljs language-sql"><div class="MuiBox-root css-1qhimia">ADMIN <span class="hljs-keyword">SHOW</span> SLOW recent N;