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<link rel="alternate" hreflang="en-us" href="https://iotdb.apache.org/UserGuide/V1.1.x/Maintenance-Tools/Maintenance-Command.html"><meta property="og:url" content="https://iotdb.apache.org/zh/UserGuide/V1.1.x/Maintenance-Tools/Maintenance-Command.html"><meta property="og:site_name" content="IoTDB Website"><meta property="og:title" content="运维命令"><meta property="og:description" content="FLUSH 将指定 database 的内存缓存区 Memory Table 的数据持久化到磁盘上，并将数据文件封口。在集群模式下，我们提供了持久化本节点的指定 database 的缓存、持久化整个集群指定 database 的缓存命令。 注意：此命令客户端不需要手动调用，IoTDB 有 wal 保证数据安全，IoTDB 会选择合适的时机进行 flus..."><meta property="og:type" content="article"><meta property="og:locale" content="zh-CN"><meta property="og:locale:alternate" content="en-US"><meta property="og:updated_time" content="2024-03-29T10:50:02.000Z"><meta property="article:modified_time" content="2024-03-29T10:50:02.000Z"><script type="application/ld+json">{"@context":"https://schema.org","@type":"Article","headline":"运维命令","image":[""],"dateModified":"2024-03-29T10:50:02.000Z","author":[]}</script><link rel="icon" href="/favicon.ico"><meta name="Description" content="Apache IoTDB: Time Series Database for IoT"><meta name="Keywords" content="TSDB, time series, time series database, IoTDB, IoT database, IoT data management,时序数据库, 时间序列管理, IoTDB, 物联网数据库, 实时数据库, 物联网数据管理, 物联网数据"><meta name="baidu-site-verification" content="wfKETzB3OT"><meta name="google-site-verification" content="mZWAoRY0yj_HAr-s47zHCGHzx5Ju-RVm5wDbPnwQYFo"><script type="text/javascript">
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active nav-link active vp-sidebar-link vp-sidebar-page active" href="/zh/UserGuide/V1.1.x/Maintenance-Tools/Maintenance-Command.html"><!---->运维命令<!----></a><ul class="vp-sidebar-sub-headers"><li class="vp-sidebar-sub-header"><a aria-label="FLUSH" class="vp-link nav-link vp-sidebar-link vp-heading nav-link vp-sidebar-link vp-heading" href="/zh/UserGuide/V1.1.x/Maintenance-Tools/Maintenance-Command.html#flush"><!---->FLUSH<!----></a><ul class="vp-sidebar-sub-headers"></ul></li><li class="vp-sidebar-sub-header"><a aria-label="CLEAR CACHE" class="vp-link nav-link vp-sidebar-link vp-heading nav-link vp-sidebar-link vp-heading" href="/zh/UserGuide/V1.1.x/Maintenance-Tools/Maintenance-Command.html#clear-cache"><!---->CLEAR CACHE<!----></a><ul class="vp-sidebar-sub-headers"></ul></li><li class="vp-sidebar-sub-header"><a aria-label="SET SYSTEM TO READONLY / RUNNING" class="vp-link nav-link vp-sidebar-link vp-heading nav-link vp-sidebar-link vp-heading" href="/zh/UserGuide/V1.1.x/Maintenance-Tools/Maintenance-Command.html#set-system-to-readonly-running"><!---->SET SYSTEM TO READONLY / RUNNING<!----></a><ul class="vp-sidebar-sub-headers"></ul></li><li class="vp-sidebar-sub-header"><a aria-label="终止查询" class="vp-link nav-link vp-sidebar-link vp-heading nav-link vp-sidebar-link vp-heading" href="/zh/UserGuide/V1.1.x/Maintenance-Tools/Maintenance-Command.html#终止查询"><!---->终止查询<!----></a><ul class="vp-sidebar-sub-headers"><li class="vp-sidebar-sub-header"><a aria-label="Session 超时" class="vp-link nav-link vp-sidebar-link vp-heading nav-link vp-sidebar-link vp-heading" href="/zh/UserGuide/V1.1.x/Maintenance-Tools/Maintenance-Command.html#session-超时"><!---->Session 超时<!----></a><ul class="vp-sidebar-sub-headers"></ul></li><li class="vp-sidebar-sub-header"><a aria-label="查询超时" class="vp-link nav-link vp-sidebar-link vp-heading nav-link vp-sidebar-link vp-heading" href="/zh/UserGuide/V1.1.x/Maintenance-Tools/Maintenance-Command.html#查询超时"><!---->查询超时<!----></a><ul class="vp-sidebar-sub-headers"></ul></li><li class="vp-sidebar-sub-header"><a aria-label="查询终止" class="vp-link nav-link vp-sidebar-link vp-heading nav-link vp-sidebar-link vp-heading" href="/zh/UserGuide/V1.1.x/Maintenance-Tools/Maintenance-Command.html#查询终止"><!---->查询终止<!----></a><ul class="vp-sidebar-sub-headers"></ul></li></ul></li><li class="vp-sidebar-sub-header"><a aria-label="SHOW QUERIES" class="vp-link nav-link vp-sidebar-link vp-heading nav-link vp-sidebar-link vp-heading" href="/zh/UserGuide/V1.1.x/Maintenance-Tools/Maintenance-Command.html#show-queries"><!---->SHOW QUERIES<!----></a><ul class="vp-sidebar-sub-headers"><li class="vp-sidebar-sub-header"><a aria-label="语法" class="vp-link nav-link vp-sidebar-link vp-heading nav-link vp-sidebar-link vp-heading" href="/zh/UserGuide/V1.1.x/Maintenance-Tools/Maintenance-Command.html#语法"><!---->语法<!----></a><ul class="vp-sidebar-sub-headers"></ul></li><li class="vp-sidebar-sub-header"><a aria-label="结果集" class="vp-link nav-link vp-sidebar-link vp-heading nav-link vp-sidebar-link vp-heading" href="/zh/UserGuide/V1.1.x/Maintenance-Tools/Maintenance-Command.html#结果集"><!---->结果集<!----></a><ul class="vp-sidebar-sub-headers"></ul></li><li class="vp-sidebar-sub-header"><a aria-label="SQL示例" class="vp-link nav-link vp-sidebar-link vp-heading nav-link vp-sidebar-link vp-heading" href="/zh/UserGuide/V1.1.x/Maintenance-Tools/Maintenance-Command.html#sql示例"><!---->SQL示例<!----></a><ul class="vp-sidebar-sub-headers"></ul></li></ul></li></ul><!--]--></li><li><!--[--><a aria-label="日志工具" class="vp-link nav-link vp-sidebar-link vp-sidebar-page nav-link vp-sidebar-link vp-sidebar-page" href="/zh/UserGuide/V1.1.x/Maintenance-Tools/Log-Tool.html"><!---->日志工具<!----></a><ul class="vp-sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a aria-label="JMX 工具" class="vp-link nav-link vp-sidebar-link vp-sidebar-page nav-link vp-sidebar-link vp-sidebar-page" href="/zh/UserGuide/V1.1.x/Maintenance-Tools/JMX-Tool.html"><!---->JMX 工具<!----></a><ul class="vp-sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a aria-label="Mlog解析工具" class="vp-link nav-link vp-sidebar-link vp-sidebar-page nav-link vp-sidebar-link vp-sidebar-page" href="/zh/UserGuide/V1.1.x/Maintenance-Tools/MLogParser-Tool.html"><!---->Mlog解析工具<!----></a><ul class="vp-sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a aria-label="IoTDB数据文件夹概览工具" class="vp-link nav-link vp-sidebar-link vp-sidebar-page nav-link vp-sidebar-link vp-sidebar-page" href="/zh/UserGuide/V1.1.x/Maintenance-Tools/IoTDB-Data-Dir-Overview-Tool.html"><!---->IoTDB数据文件夹概览工具<!----></a><ul class="vp-sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a aria-label="TsFile概览工具" class="vp-link nav-link vp-sidebar-link vp-sidebar-page nav-link vp-sidebar-link vp-sidebar-page" href="/zh/UserGuide/V1.1.x/Maintenance-Tools/TsFile-Sketch-Tool.html"><!---->TsFile概览工具<!----></a><ul class="vp-sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a aria-label="TsFile Resource概览工具" class="vp-link nav-link vp-sidebar-link vp-sidebar-page nav-link vp-sidebar-link vp-sidebar-page" href="/zh/UserGuide/V1.1.x/Maintenance-Tools/TsFile-Resource-Sketch-Tool.html"><!---->TsFile Resource概览工具<!----></a><ul class="vp-sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a aria-label="TsFile 拆分工具" class="vp-link nav-link vp-sidebar-link vp-sidebar-page nav-link vp-sidebar-link vp-sidebar-page" href="/zh/UserGuide/V1.1.x/Maintenance-Tools/TsFile-Split-Tool.html"><!---->TsFile 拆分工具<!----></a><ul class="vp-sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a aria-label="TsFile 导入导出工具" class="vp-link nav-link vp-sidebar-link vp-sidebar-page nav-link vp-sidebar-link vp-sidebar-page" href="/zh/UserGuide/V1.1.x/Maintenance-Tools/TsFile-Load-Export-Tool.html"><!---->TsFile 导入导出工具<!----></a><ul class="vp-sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a aria-label="CSV 导入导出工具" class="vp-link nav-link vp-sidebar-link vp-sidebar-page nav-link vp-sidebar-link vp-sidebar-page" href="/zh/UserGuide/V1.1.x/Maintenance-Tools/CSV-Tool.html"><!---->CSV 导入导出工具<!----></a><ul class="vp-sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a aria-label="慢查询管理" class="vp-link nav-link vp-sidebar-link vp-sidebar-page nav-link vp-sidebar-link vp-sidebar-page" href="/zh/UserGuide/V1.1.x/Maintenance-Tools/Slow-Query-Management.html"><!---->慢查询管理<!----></a><ul class="vp-sidebar-sub-headers"></ul><!--]--></li></ul></section></li><li><section class="vp-sidebar-group"><button class="vp-sidebar-heading clickable" type="button"><!----><span class="vp-sidebar-title">端云协同</span><span class="vp-arrow end"></span></button><!----></section></li><li><section class="vp-sidebar-group"><button class="vp-sidebar-heading clickable" type="button"><!----><span class="vp-sidebar-title">系统集成</span><span class="vp-arrow end"></span></button><!----></section></li><li><section class="vp-sidebar-group"><button class="vp-sidebar-heading clickable" type="button"><!----><span class="vp-sidebar-title">分布式</span><span class="vp-arrow end"></span></button><!----></section></li><li><section class="vp-sidebar-group"><button class="vp-sidebar-heading clickable" type="button"><!----><span class="vp-sidebar-title">FAQ</span><span class="vp-arrow end"></span></button><!----></section></li><li><section class="vp-sidebar-group"><button class="vp-sidebar-heading clickable" type="button"><!----><span class="vp-sidebar-title">参考</span><span class="vp-arrow end"></span></button><!----></section></li></ul><!--[--><!----><!--]--></aside><!--[--><main id="main-content" class="vp-page"><!--[--><!--[--><!----><!--]--><!----><nav class="vp-breadcrumb disable"></nav><div class="vp-page-title"><h1><!---->运维命令</h1><div class="page-info"><!----><!----><span class="page-date-info" aria-label="写作日期"><svg xmlns="http://www.w3.org/2000/svg" class="icon calendar-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="calendar icon"><path d="M716.4 110.137c0-18.753-14.72-33.473-33.472-33.473-18.753 0-33.473 14.72-33.473 33.473v33.473h66.993v-33.473zm-334.87 0c0-18.753-14.72-33.473-33.473-33.473s-33.52 14.72-33.52 33.473v33.473h66.993v-33.473zm468.81 33.52H716.4v100.465c0 18.753-14.72 33.473-33.472 33.473a33.145 33.145 0 01-33.473-33.473V143.657H381.53v100.465c0 18.753-14.72 33.473-33.473 33.473a33.145 33.145 0 01-33.473-33.473V143.657H180.6A134.314 134.314 0 0046.66 277.595v535.756A134.314 134.314 0 00180.6 947.289h669.74a134.36 134.36 0 00133.94-133.938V277.595a134.314 134.314 0 00-133.94-133.938zm33.473 267.877H147.126a33.145 33.145 0 01-33.473-33.473c0-18.752 14.72-33.473 33.473-33.473h736.687c18.752 0 33.472 14.72 33.472 33.473a33.145 33.145 0 01-33.472 33.473z"></path></svg><span><!----></span><meta property="datePublished" 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6.99-15.793 15.794-15.793s15.793 6.99 15.793 15.793c0 95.019-73.789 172.82-165.96 177.093z"></path></svg><span>大约 4 分钟</span><meta property="timeRequired" content="PT4M"></span><!----><!----></div><hr></div><div class="toc-place-holder"><aside id="toc"><!--[--><!----><!--]--><div class="toc-header">此页内容<button type="button" class="print-button" title="打印"><svg xmlns="http://www.w3.org/2000/svg" class="icon print-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="print icon"><path d="M819.2 364.8h-44.8V128c0-17.067-14.933-32-32-32H281.6c-17.067 0-32 14.933-32 32v236.8h-44.8C145.067 364.8 96 413.867 96 473.6v192c0 59.733 49.067 108.8 108.8 108.8h44.8V896c0 17.067 14.933 32 32 32h460.8c17.067 0 32-14.933 32-32V774.4h44.8c59.733 0 108.8-49.067 108.8-108.8v-192c0-59.733-49.067-108.8-108.8-108.8zM313.6 160h396.8v204.8H313.6V160zm396.8 704H313.6V620.8h396.8V864zM864 665.6c0 25.6-19.2 44.8-44.8 44.8h-44.8V588.8c0-17.067-14.933-32-32-32H281.6c-17.067 0-32 14.933-32 32v121.6h-44.8c-25.6 0-44.8-19.2-44.8-44.8v-192c0-25.6 19.2-44.8 44.8-44.8h614.4c25.6 0 44.8 19.2 44.8 44.8v192z"></path></svg></button></div><div class="toc-wrapper"><ul class="toc-list"><!--[--><li class="toc-item"><a class="vp-link toc-link level2 toc-link level2" href="#flush">FLUSH</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level2 toc-link level2" href="#clear-cache">CLEAR CACHE</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level2 toc-link level2" href="#set-system-to-readonly-running">SET SYSTEM TO READONLY / RUNNING</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level2 toc-link level2" href="#终止查询">终止查询</a></li><li><ul class="toc-list"><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#session-超时">Session 超时</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#查询超时">查询超时</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#查询终止">查询终止</a></li><!----><!--]--></ul></li><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level2 toc-link level2" href="#show-queries">SHOW QUERIES</a></li><li><ul class="toc-list"><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#语法">语法</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#结果集">结果集</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#sql示例">SQL示例</a></li><!----><!--]--></ul></li><!--]--></ul><div class="toc-marker" style="top:-1.7rem;"></div></div><!--[--><!----><!--]--></aside></div><!--[--><!----><!--]--><div class="theme-hope-content"><!--
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--><h1 id="运维命令" tabindex="-1"><a class="header-anchor" href="#运维命令" aria-hidden="true">#</a> 运维命令</h1><h2 id="flush" tabindex="-1"><a class="header-anchor" href="#flush" aria-hidden="true">#</a> FLUSH</h2><p>将指定 database 的内存缓存区 Memory Table 的数据持久化到磁盘上，并将数据文件封口。在集群模式下，我们提供了持久化本节点的指定 database 的缓存、持久化整个集群指定 database 的缓存命令。</p><p>注意：此命令客户端不需要手动调用，IoTDB 有 wal 保证数据安全，IoTDB 会选择合适的时机进行 flush。<br> 如果频繁调用 flush 会导致数据文件很小，降低查询性能。</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code>IoTDB<span class="token operator">&gt;</span> FLUSH
IoTDB<span class="token operator">&gt;</span> FLUSH <span class="token keyword">ON</span> <span class="token keyword">LOCAL</span>
IoTDB<span class="token operator">&gt;</span> FLUSH <span class="token keyword">ON</span> CLUSTER
IoTDB<span class="token operator">&gt;</span> FLUSH root<span class="token punctuation">.</span>ln
IoTDB<span class="token operator">&gt;</span> FLUSH root<span class="token punctuation">.</span>sg1<span class="token punctuation">,</span>root<span class="token punctuation">.</span>sg2 <span class="token keyword">ON</span> <span class="token keyword">LOCAL</span>
IoTDB<span class="token operator">&gt;</span> FLUSH root<span class="token punctuation">.</span>sg1<span class="token punctuation">,</span>root<span class="token punctuation">.</span>sg2 <span class="token keyword">ON</span> CLUSTER
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="clear-cache" tabindex="-1"><a class="header-anchor" href="#clear-cache" aria-hidden="true">#</a> CLEAR CACHE</h2><p>手动清除chunk, chunk metadata和timeseries metadata的缓存，在内存资源紧张时，可以通过此命令，释放查询时缓存所占的内存空间。在集群模式下，我们提供了清空本节点缓存、清空整个集群缓存命令。</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code>IoTDB<span class="token operator">&gt;</span> CLEAR CACHE
IoTDB<span class="token operator">&gt;</span> CLEAR CACHE <span class="token keyword">ON</span> <span class="token keyword">LOCAL</span>
IoTDB<span class="token operator">&gt;</span> CLEAR CACHE <span class="token keyword">ON</span> CLUSTER
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="set-system-to-readonly-running" tabindex="-1"><a class="header-anchor" href="#set-system-to-readonly-running" aria-hidden="true">#</a> SET SYSTEM TO READONLY / RUNNING</h2><p>手动设置系统为正常运行、只读状态。在集群模式下，我们提供了设置本节点状态、设置整个集群状态的命令，默认对整个集群生效。</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code>IoTDB<span class="token operator">&gt;</span> <span class="token keyword">SET</span> SYSTEM <span class="token keyword">TO</span> RUNNING
IoTDB<span class="token operator">&gt;</span> <span class="token keyword">SET</span> SYSTEM <span class="token keyword">TO</span> READONLY <span class="token keyword">ON</span> <span class="token keyword">LOCAL</span>
IoTDB<span class="token operator">&gt;</span> <span class="token keyword">SET</span> SYSTEM <span class="token keyword">TO</span> READONLY <span class="token keyword">ON</span> CLUSTER
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="终止查询" tabindex="-1"><a class="header-anchor" href="#终止查询" aria-hidden="true">#</a> 终止查询</h2><p>IoTDB 支持设置 Session 连接超时和查询超时时间，并支持手动终止正在执行的查询。</p><h3 id="session-超时" tabindex="-1"><a class="header-anchor" href="#session-超时" aria-hidden="true">#</a> Session 超时</h3><p>Session 超时控制何时关闭空闲 Session。空闲 Session 指在一段时间内没有发起任何操作的 Session。</p><p>Session 超时默认未开启。可以在配置文件中通过 <code>dn_session_timeout_threshold</code> 参数进行配置。</p><h3 id="查询超时" tabindex="-1"><a class="header-anchor" href="#查询超时" aria-hidden="true">#</a> 查询超时</h3><p>对于执行时间过长的查询，IoTDB 将强行中断该查询，并抛出超时异常，如下所示：</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code>IoTDB<span class="token operator">&gt;</span> <span class="token keyword">select</span> <span class="token operator">*</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span><span class="token operator">*</span><span class="token operator">*</span><span class="token punctuation">;</span>
Msg: <span class="token number">701</span> <span class="token keyword">Current</span> query <span class="token operator">is</span> <span class="token keyword">time</span> <span class="token keyword">out</span><span class="token punctuation">,</span> please <span class="token keyword">check</span> your statement <span class="token operator">or</span> <span class="token keyword">modify</span> timeout parameter<span class="token punctuation">.</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><p>系统默认的超时时间为 60000 ms，可以在配置文件中通过 <code>query_timeout_threshold</code> 参数进行自定义配置。</p><p>如果您使用 JDBC 或 Session，还支持对单个查询设置超时时间（单位为 ms）：</p><div class="language-java line-numbers-mode" data-ext="java"><pre class="language-java"><code><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token class-name">IoTDBStatement</span><span class="token punctuation">)</span> statement<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">executeQuery</span><span class="token punctuation">(</span><span class="token class-name">String</span> sql<span class="token punctuation">,</span> <span class="token keyword">long</span> timeoutInMS<span class="token punctuation">)</span>
session<span class="token punctuation">.</span><span class="token function">executeQueryStatement</span><span class="token punctuation">(</span><span class="token class-name">String</span> sql<span class="token punctuation">,</span> <span class="token keyword">long</span> timeout<span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><blockquote><p>如果不配置超时时间参数或将超时时间设置为负数，将使用服务器端默认的超时时间。<br> 如果超时时间设置为0，则会禁用超时功能。</p></blockquote><h3 id="查询终止" tabindex="-1"><a class="header-anchor" href="#查询终止" aria-hidden="true">#</a> 查询终止</h3><p>除了被动地等待查询超时外，IoTDB 还支持主动地终止查询：</p><h4 id="终止指定查询" tabindex="-1"><a class="header-anchor" href="#终止指定查询" aria-hidden="true">#</a> 终止指定查询</h4><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">KILL</span> QUERY <span class="token operator">&lt;</span>queryId<span class="token operator">&gt;</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>通过指定 <code>queryId</code> 可以中止指定的查询，<code>queryId</code>是一个字符串，所以使用时需要添加引号。</p><p>为了获取正在执行的查询 id，用户可以使用 <a href="#show-queries">show queries</a> 命令，该命令将显示所有正在执行的查询列表。</p><h5 id="示例" tabindex="-1"><a class="header-anchor" href="#示例" aria-hidden="true">#</a> 示例</h5><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">kill</span> query <span class="token string">&#39;20221205_114444_00003_5&#39;</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h4 id="终止所有查询" tabindex="-1"><a class="header-anchor" href="#终止所有查询" aria-hidden="true">#</a> 终止所有查询</h4><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">KILL</span> <span class="token keyword">ALL</span> QUERIES
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>终止所有DataNode上的所有查询。</p><h2 id="show-queries" tabindex="-1"><a class="header-anchor" href="#show-queries" aria-hidden="true">#</a> SHOW QUERIES</h2><p>该命令用于显示所有正在执行的查询，有以下使用场景：</p><ul><li>想要中止某个查询时，需要获取查询对应的queryId</li><li>中止某个查询后验证查询是否已被中止</li></ul><h3 id="语法" tabindex="-1"><a class="header-anchor" href="#语法" aria-hidden="true">#</a> 语法</h3><div class="language-SQL line-numbers-mode" data-ext="SQL"><pre class="language-SQL"><code>SHOW QUERIES | (QUERY PROCESSLIST)
[WHERE whereCondition]
[ORDER BY sortKey {ASC | DESC}]
[LIMIT rowLimit] [OFFSET rowOffset]
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>注意：</p><ul><li>兼容旧语法<code>show query processlist</code></li><li>使用WHERE时请保证过滤的目标列是结果集中存在的列</li><li>使用ORDER BY时请保证sortKey是结果集中存在的列</li></ul><h3 id="结果集" tabindex="-1"><a class="header-anchor" href="#结果集" aria-hidden="true">#</a> 结果集</h3><p>Time：查询开始时间，数据类型为<code>INT64</code><br> QueryId：集群级别唯一的查询标识，数据类型为<code>TEXT</code>，格式为<code>yyyyMMdd_HHmmss_index_dataNodeId</code><br> DataNodeId：执行该查询的节点，数据类型为<code>INT32</code><br> ElapsedTime：查询已执行时间（不完全精确），以<code>秒</code>为单位，数据类型为<code>FLOAT</code><br> Statement：查询的原始语句，数据类型为<code>TEXT</code></p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+-----------------------------+-----------------------+----------+-----------+------------+
| Time| QueryId|DataNodeId|ElapsedTime| Statement|
+-----------------------------+-----------------------+----------+-----------+------------+
|2022-12-30T13:26:47.260+08:00|20221230_052647_00005_1| 1| 0.019|show queries|
+-----------------------------+-----------------------+----------+-----------+------------+
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>注意：</p><ul><li>结果集默认按照Time列升序排列，如需按其他key进行排序，请使用ORDER BY子句</li></ul><h3 id="sql示例" tabindex="-1"><a class="header-anchor" href="#sql示例" aria-hidden="true">#</a> SQL示例</h3><h4 id="示例1-获取当前所有执行时间大于30s的查询" tabindex="-1"><a class="header-anchor" href="#示例1-获取当前所有执行时间大于30s的查询" aria-hidden="true">#</a> 示例1：获取当前所有执行时间大于30s的查询</h4><p>SQL 语句为：</p><div class="language-SQL line-numbers-mode" data-ext="SQL"><pre class="language-SQL"><code>SHOW QUERIES WHERE ElapsedTime &gt; 30
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>该 SQL 语句的执行结果如下：</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+-----------------------------+-----------------------+----------+-----------+-----------------------------+
| Time| QueryId|DataNodeId|ElapsedTime| Statement|
+-----------------------------+-----------------------+----------+-----------+-----------------------------+
|2022-12-05T11:44:44.515+08:00|20221205_114444_00002_2| 2| 31.111| select * from root.test1|
+-----------------------------+-----------------------+----------+-----------+-----------------------------+
|2022-12-05T11:44:45.515+08:00|20221205_114445_00003_2| 2| 30.111| select * from root.test2|
+-----------------------------+-----------------------+----------+-----------+-----------------------------+
|2022-12-05T11:44:43.515+08:00|20221205_114443_00001_3| 3| 32.111| select * from root.**|
+-----------------------------+-----------------------+----------+-----------+-----------------------------+
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h4 id="示例2-获取当前执行耗时top5的查询" tabindex="-1"><a class="header-anchor" href="#示例2-获取当前执行耗时top5的查询" aria-hidden="true">#</a> 示例2：获取当前执行耗时Top5的查询</h4><p>SQL 语句为：</p><div class="language-SQL line-numbers-mode" data-ext="SQL"><pre class="language-SQL"><code>SHOW QUERIES limit 5
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>等价于</p><div class="language-SQL line-numbers-mode" data-ext="SQL"><pre class="language-SQL"><code>SHOW QUERIES ORDER BY ElapsedTime DESC limit 5
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>该 SQL 语句的执行结果如下：</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>+-----------------------------+-----------------------+----------+-----------+-----------------------------+
| Time| QueryId|DataNodeId|ElapsedTime| Statement|
+-----------------------------+-----------------------+----------+-----------+-----------------------------+
|2022-12-05T11:44:44.515+08:00|20221205_114444_00003_5| 5| 31.111| select * from root.test1|
+-----------------------------+-----------------------+----------+-----------+-----------------------------+
|2022-12-05T11:44:45.515+08:00|20221205_114445_00003_2| 2| 30.111| select * from root.test2|
+-----------------------------+-----------------------+----------+-----------+-----------------------------+
|2022-12-05T11:44:46.515+08:00|20221205_114446_00003_3| 3| 29.111| select * from root.test3|
+-----------------------------+-----------------------+----------+-----------+-----------------------------+
|2022-12-05T11:44:47.515+08:00|20221205_114447_00003_2| 2| 28.111| select * from root.test4|
+-----------------------------+-----------------------+----------+-----------+-----------------------------+
|2022-12-05T11:44:48.515+08:00|20221205_114448_00003_4| 4| 27.111| select * from root.test5|
+-----------------------------+-----------------------+----------+-----------+-----------------------------+
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