Google Git
Sign in
apache/iotdb-website/refs/heads/asf-site/./zh/UserGuide/latest-Table/SQL-Manual/SQL-Maintenance-Statements_apache.html
blob: 517a1426ff5c5d714ced46b8e7edf77195262d5b [file]
<!doctype html>
<html lang="zh-CN" data-theme="light">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width,initial-scale=1" />
<meta name="generator" content="VuePress 2.0.0-rc.26" />
<meta name="theme" content="VuePress Theme Hope 2.0.0-rc.99" />
<style>
:root {
--vp-c-bg: #fff;
}
[data-theme="dark"] {
--vp-c-bg: #1b1b1f;
}
html,
body {
background: var(--vp-c-bg);
}
</style>
<script>
const userMode = localStorage.getItem("vuepress-theme-hope-scheme");
const systemDarkMode =
window.matchMedia &&
window.matchMedia("(prefers-color-scheme: dark)").matches;
if (userMode === "dark" || (userMode !== "light" && systemDarkMode)) {
document.documentElement.setAttribute("data-theme", "dark");
}
</script>
<script type="application/ld+json">{"@context":"https://schema.org","@type":"Article","headline":"运维语句","image":[""],"dateModified":"2026-04-15T10:39:00.000Z","author":[]}</script><meta property="og:url" content="https://iotdb.apache.org/zh/UserGuide/latest-Table/SQL-Manual/SQL-Maintenance-Statements_apache.html"><meta property="og:site_name" content="IoTDB Website"><meta property="og:title" content="运维语句"><meta property="og:description" content="运维语句 1. 状态查看 1.1 查看当前的树/表模型 语法： 示例： 1.2 查看登录的用户名 语法： 示例： 1.3 查看连接的数据库名 语法： 示例： 1.4 查看集群版本 语法： 示例： 1.5 查看集群关键参数 语法： 示例： 1.6 查看集群ID 语法： 示例： 1.7 查看服务器的时间 查看客户端直连的 DataNode 进程所在的服务器..."><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="2026-04-15T10:39:00.000Z"><meta property="article:modified_time" content="2026-04-15T10:39:00.000Z"><link rel="alternate" hreflang="en-us" href="https://iotdb.apache.org/UserGuide/latest-Table/SQL-Manual/SQL-Maintenance-Statements_apache.html"><script async src="https://widget.kapa.ai/kapa-widget.bundle.js" data-website-id="2d37bfdd-8d98-40ba-9223-9d4f81bfb327" data-project-name="Apache IoTDB" data-project-color="#FFFFFF" data-button-z-index="1999" data-button-padding="4px" data-button-border-radius="4px" data-button-image-height="24px" data-button-image-width="20px" data-button-text-color="#9E2878" data-project-logo="https://iotdb.apache.org/img/logo.svg" data-button-position-right="16px" data-button-position-bottom="8px" data-button-height="56px" data-button-width="48px" data-button-text="Ask" data-modal-override-open-selector="#custom-ask-ai-button" data-modal-image-width="150px" data-modal-title="AI Docs" data-modal-title-color="#9E2878" data-deep-thinking-button-active-bg-color="#F6F7F8" data-deep-thinking-button-active-text-color="#9E2878" data-deep-thinking-button-active-hover-text-color="#9E2878" data-modal-disclaimer="这是一个针对 Apache IoTDB 的定制化大型语言模型，能够访问所有[文档](iotdb.apache.org/docs/)、[GitHub 公开问题、PR 和自述文件](github.com/apache/iotdb)。&#10;&#10;
如果您遇到 <Error in verifying browser for feedback submission. Captcha token could not be obtained.> 请确保您能够顺畅访问 Google 服务。" data-user-analytics-fingerprint-enabled="true" data-consent-required="true" data-consent-screen-disclaimer="点击<I agree, let's chat>即表示您同意按照 kapa.ai 的[隐私政策](https://www.kapa.ai/content/privacy-policy)使用 AI 助手。本服务使用 reCAPTCHA，您需要同意 Google 的[隐私政策](https://policies.google.com/privacy)和[服务条款](https://policies.google.com/terms)。继续操作即表示您明确同意 kapa.ai 和 Google 的隐私政策。" data-language="zh"></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">var _paq = window._paq = window._paq || [];
/* tracker methods like "setCustomDimension" should be called before "trackPageView" */
_paq.push(["setDoNotTrack", true]);
_paq.push(["disableCookies"]);
_paq.push(['trackPageView']);
_paq.push(['enableLinkTracking']);
(function() {
var u="https://analytics.apache.org/";
_paq.push(['setTrackerUrl', u+'matomo.php']);
_paq.push(['setSiteId', '56']);
var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0];
g.async=true; g.src=u+'matomo.js'; s.parentNode.insertBefore(g,s);
})();
</script><title>运维语句 | IoTDB Website</title><meta name="description" content="运维语句 1. 状态查看 1.1 查看当前的树/表模型 语法： 示例： 1.2 查看登录的用户名 语法： 示例： 1.3 查看连接的数据库名 语法： 示例： 1.4 查看集群版本 语法： 示例： 1.5 查看集群关键参数 语法： 示例： 1.6 查看集群ID 语法： 示例： 1.7 查看服务器的时间 查看客户端直连的 DataNode 进程所在的服务器...">
<link rel="preload" href="/assets/style-JraSdRX4.css" as="style"><link rel="stylesheet" href="/assets/style-JraSdRX4.css">
<link rel="modulepreload" href="/assets/app-C4FS647M.js"><link rel="modulepreload" href="/assets/SQL-Maintenance-Statements_apache.html-D2dmzWef.js">
</head>
<body>
<div id="app"><!--[--><!--[--><!--[--><span tabindex="-1"></span><a href="#main-content" class="vp-skip-link sr-only">跳至主要內容</a><!--]--><!--[--><div class="theme-container external-link-icon has-toc" vp-container><!--[--><header id="navbar" class="vp-navbar" vp-navbar><div class="vp-navbar-start"><button type="button" class="vp-toggle-sidebar-button" title="Toggle Sidebar"><span class="icon"></span></button><!--[--><a class="route-link vp-brand" href="/zh/" aria-label="带我回家"><img class="vp-nav-logo" src="/logo.png" alt><!----><!----></a><!--]--></div><div class="vp-navbar-center"><!--[--><!--]--></div><div class="vp-navbar-end"><!--[--><!--[--><div id="docsearch-container" style="display:none;"></div><div class="docsearch-placeholder"><button type="button" aria-label="搜索文档" aria-keyshortcuts="Control+k" class="DocSearch DocSearch-Button"><span class="DocSearch-Button-Container"><svg width="20" height="20" viewBox="0 0 24 24" aria-hidden="true" class="DocSearch-Search-Icon"><circle cx="11" cy="11" r="8" stroke="currentColor" fill="none" stroke-width="1.4"></circle><path d="m21 21-4.3-4.3" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"></path></svg><span class="DocSearch-Button-Placeholder">搜索文档</span></span><span class="DocSearch-Button-Keys"><kbd class="DocSearch-Button-Key DocSearch-Button-Key--ctrl">Ctrl</kbd><kbd class="DocSearch-Button-Key">K</kbd></span></button></div><!--]--><div><button id="custom-ask-ai-button"> ✨ Ask AI </button></div><nav class="vp-nav-links"><div class="vp-nav-item hide-in-mobile"><div class="vp-dropdown-wrapper"><button type="button" class="vp-dropdown-title" aria-label="文档"><!--[--><!---->文档<!--]--><span class="arrow"></span><ul class="vp-dropdown"><li class="vp-dropdown-item"><a class="route-link auto-link" href="/zh/UserGuide/latest/QuickStart/QuickStart_apache.html" aria-label="v2.0.x"><!---->v2.0.x<!----></a></li><li class="vp-dropdown-item"><a class="route-link auto-link" href="/zh/UserGuide/V1.3.x/QuickStart/QuickStart_apache.html" aria-label="v1.3.x"><!---->v1.3.x<!----></a></li><li class="vp-dropdown-item"><a class="route-link auto-link" href="/zh/UserGuide/V1.2.x/QuickStart/QuickStart.html" aria-label="v1.2.x"><!---->v1.2.x<!----></a></li><li class="vp-dropdown-item"><a class="route-link auto-link" href="/zh/UserGuide/V0.13.x/QuickStart/QuickStart.html" aria-label="v0.13.x"><!---->v0.13.x<!----></a></li></ul></button></div></div><div class="vp-nav-item hide-in-mobile"><a class="auto-link external-link" href="https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=177051872" aria-label="系统设计" rel="noopener noreferrer" target="_blank"><!---->系统设计<!----></a></div><div class="vp-nav-item hide-in-mobile"><a class="route-link auto-link" href="/zh/Download/" aria-label="下载"><!---->下载<!----></a></div><div class="vp-nav-item hide-in-mobile"><div class="vp-dropdown-wrapper"><button type="button" class="vp-dropdown-title" aria-label="社区"><!--[--><!---->社区<!--]--><span class="arrow"></span><ul class="vp-dropdown"><li class="vp-dropdown-item"><a class="route-link auto-link" href="/zh/Community/About.html" aria-label="关于社区"><!---->关于社区<!----></a></li><li class="vp-dropdown-item"><a class="route-link auto-link" href="/zh/Community/Development-Guide.html" aria-label="贡献指南"><!---->贡献指南<!----></a></li><li class="vp-dropdown-item"><a class="route-link auto-link" href="/zh/Community/Community-Partners.html" aria-label="社区伙伴"><!---->社区伙伴<!----></a></li><li class="vp-dropdown-item"><a class="route-link auto-link" href="/zh/Community/Feedback.html" aria-label="交流与反馈"><!---->交流与反馈<!----></a></li><li class="vp-dropdown-item"><a class="route-link auto-link" href="/zh/Community/Events-and-Reports.html" aria-label="活动与报告"><!---->活动与报告<!----></a></li><li class="vp-dropdown-item"><a class="route-link auto-link" href="/zh/Community/Committers.html" aria-label="Committers"><!---->Committers<!----></a></li></ul></button></div></div><div class="vp-nav-item hide-in-mobile"><div class="vp-dropdown-wrapper"><button type="button" class="vp-dropdown-title" aria-label="ASF"><!--[--><!---->ASF<!--]--><span class="arrow"></span><ul class="vp-dropdown"><li class="vp-dropdown-item"><a class="auto-link external-link" href="https://www.apache.org/" aria-label="基金会" rel="noopener noreferrer" target="_blank"><!---->基金会<!----></a></li><li class="vp-dropdown-item"><a class="auto-link external-link" href="https://www.apache.org/licenses/" aria-label="许可证" rel="noopener noreferrer" target="_blank"><!---->许可证<!----></a></li><li class="vp-dropdown-item"><a class="auto-link external-link" href="https://www.apache.org/security/" aria-label="安全" rel="noopener noreferrer" target="_blank"><!---->安全<!----></a></li><li class="vp-dropdown-item"><a class="auto-link external-link" href="https://www.apache.org/foundation/sponsorship.html" aria-label="赞助" rel="noopener noreferrer" target="_blank"><!---->赞助<!----></a></li><li class="vp-dropdown-item"><a class="auto-link external-link" href="https://www.apache.org/foundation/thanks.html" aria-label="致谢" rel="noopener noreferrer" target="_blank"><!---->致谢<!----></a></li><li class="vp-dropdown-item"><a class="auto-link external-link" href="https://www.apache.org/events/current-event" aria-label="活动" rel="noopener noreferrer" target="_blank"><!---->活动<!----></a></li><li class="vp-dropdown-item"><a class="auto-link external-link" href="https://privacy.apache.org/policies/privacy-policy-public.html" aria-label="隐私" rel="noopener noreferrer" target="_blank"><!---->隐私<!----></a></li></ul></button></div></div></nav><div class="vp-nav-item"><div class="vp-dropdown-wrapper"><button type="button" class="vp-dropdown-title" aria-label="选择语言"><!--[--><svg xmlns="http://www.w3.org/2000/svg" class="icon i18n-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="i18n icon" name="i18n" style="width:1rem;height:1rem;vertical-align:middle;"><path d="M379.392 460.8 494.08 575.488l-42.496 102.4L307.2 532.48 138.24 701.44l-71.68-72.704L234.496 460.8l-45.056-45.056c-27.136-27.136-51.2-66.56-66.56-108.544h112.64c7.68 14.336 16.896 27.136 26.112 35.84l45.568 46.08 45.056-45.056C382.976 312.32 409.6 247.808 409.6 204.8H0V102.4h256V0h102.4v102.4h256v102.4H512c0 70.144-37.888 161.28-87.04 210.944L378.88 460.8zM576 870.4 512 1024H409.6l256-614.4H768l256 614.4H921.6l-64-153.6H576zM618.496 768h196.608L716.8 532.48 618.496 768z"></path></svg><!--]--><span class="arrow"></span><ul class="vp-dropdown"><li class="vp-dropdown-item"><a class="route-link auto-link" href="/UserGuide/latest-Table/SQL-Manual/SQL-Maintenance-Statements_apache.html" aria-label="English"><!---->English<!----></a></li><li class="vp-dropdown-item"><a class="route-link route-link-active auto-link" href="/zh/UserGuide/latest-Table/SQL-Manual/SQL-Maintenance-Statements_apache.html" aria-label="简体中文"><!---->简体中文<!----></a></li></ul></button></div></div><div class="vp-nav-item hide-in-mobile"><button type="button" class="vp-color-mode-switch" id="color-mode-switch"><svg xmlns="http://www.w3.org/2000/svg" class="icon auto-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="auto icon" name="auto" style="display:none;"><path d="M512 992C246.92 992 32 777.08 32 512S246.92 32 512 32s480 214.92 480 480-214.92 480-480 480zm0-840c-198.78 0-360 161.22-360 360 0 198.84 161.22 360 360 360s360-161.16 360-360c0-198.78-161.22-360-360-360zm0 660V212c165.72 0 300 134.34 300 300 0 165.72-134.28 300-300 300z"></path></svg><svg xmlns="http://www.w3.org/2000/svg" class="icon dark-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="dark icon" name="dark" style="display:none;"><path d="M524.8 938.667h-4.267a439.893 439.893 0 0 1-313.173-134.4 446.293 446.293 0 0 1-11.093-597.334A432.213 432.213 0 0 1 366.933 90.027a42.667 42.667 0 0 1 45.227 9.386 42.667 42.667 0 0 1 10.24 42.667 358.4 358.4 0 0 0 82.773 375.893 361.387 361.387 0 0 0 376.747 82.774 42.667 42.667 0 0 1 54.187 55.04 433.493 433.493 0 0 1-99.84 154.88 438.613 438.613 0 0 1-311.467 128z"></path></svg><svg xmlns="http://www.w3.org/2000/svg" class="icon light-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="light icon" name="light" style="display:block;"><path d="M952 552h-80a40 40 0 0 1 0-80h80a40 40 0 0 1 0 80zM801.88 280.08a41 41 0 0 1-57.96-57.96l57.96-58a41.04 41.04 0 0 1 58 58l-58 57.96zM512 752a240 240 0 1 1 0-480 240 240 0 0 1 0 480zm0-560a40 40 0 0 1-40-40V72a40 40 0 0 1 80 0v80a40 40 0 0 1-40 40zm-289.88 88.08-58-57.96a41.04 41.04 0 0 1 58-58l57.96 58a41 41 0 0 1-57.96 57.96zM192 512a40 40 0 0 1-40 40H72a40 40 0 0 1 0-80h80a40 40 0 0 1 40 40zm30.12 231.92a41 41 0 0 1 57.96 57.96l-57.96 58a41.04 41.04 0 0 1-58-58l58-57.96zM512 832a40 40 0 0 1 40 40v80a40 40 0 0 1-80 0v-80a40 40 0 0 1 40-40zm289.88-88.08 58 57.96a41.04 41.04 0 0 1-58 58l-57.96-58a41 41 0 0 1 57.96-57.96z"></path></svg></button></div><div class="vp-nav-item vp-action"><a class="vp-action-link" href="https://github.com/apache/iotdb" target="_blank" rel="noopener noreferrer" aria-label="GitHub"><svg xmlns="http://www.w3.org/2000/svg" class="icon github-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="github icon" name="github" style="width:1.25rem;height:1.25rem;vertical-align:middle;"><path d="M511.957 21.333C241.024 21.333 21.333 240.981 21.333 512c0 216.832 140.544 400.725 335.574 465.664 24.49 4.395 32.256-10.07 32.256-23.083 0-11.69.256-44.245 0-85.205-136.448 29.61-164.736-64.64-164.736-64.64-22.315-56.704-54.4-71.765-54.4-71.765-44.587-30.464 3.285-29.824 3.285-29.824 49.195 3.413 75.179 50.517 75.179 50.517 43.776 75.008 114.816 53.333 142.762 40.79 4.523-31.66 17.152-53.377 31.19-65.537-108.971-12.458-223.488-54.485-223.488-242.602 0-53.547 19.114-97.323 50.517-131.67-5.035-12.33-21.93-62.293 4.779-129.834 0 0 41.258-13.184 134.912 50.346a469.803 469.803 0 0 1 122.88-16.554c41.642.213 83.626 5.632 122.88 16.554 93.653-63.488 134.784-50.346 134.784-50.346 26.752 67.541 9.898 117.504 4.864 129.834 31.402 34.347 50.474 78.123 50.474 131.67 0 188.586-114.73 230.016-224.042 242.09 17.578 15.232 33.578 44.672 33.578 90.454v135.85c0 13.142 7.936 27.606 32.854 22.87C862.25 912.597 1002.667 728.747 1002.667 512c0-271.019-219.648-490.667-490.71-490.667z"></path></svg></a></div><!--]--><button type="button" class="vp-toggle-navbar-button" aria-label="Toggle Navbar" aria-expanded="false" aria-controls="nav-screen"><span><span class="vp-top"></span><span class="vp-middle"></span><span class="vp-bottom"></span></span></button></div></header><!----><!--]--><!----><div class="toggle-sidebar-wrapper"><span class="arrow start"></span></div><aside id="sidebar" class="vp-sidebar" vp-sidebar><!--[--><p class="vp-sidebar-header iotdb-sidebar-header"><span class="vp-sidebar-title">IoTDB用户手册(V2.0.x)</span></p><div class="sidebar-top-wrapper"><ul class="switch-list"><li class="switch-type">树模型</li><li class="switch-type switch-active">表模型</li></ul><div class="help-icon-wrapper"><div class="help-icon"><span>模型说明</span></div></div></div><!--]--><ul class="vp-sidebar-links"><li><section class="vp-sidebar-group"><p class="vp-sidebar-header"><!----><span class="vp-sidebar-title">IoTDB用户手册(V2.0.x)</span><!----></p><ul class="vp-sidebar-links"></ul></section></li><li><section class="vp-sidebar-group"><button class="vp-sidebar-header clickable" type="button"><!----><span class="vp-sidebar-title">关于IoTDB</span><span class="vp-arrow end"></span></button><!----></section></li><li><section class="vp-sidebar-group"><button class="vp-sidebar-header clickable" type="button"><!----><span class="vp-sidebar-title">预备知识</span><span class="vp-arrow end"></span></button><!----></section></li><li><a class="route-link auto-link vp-sidebar-link" href="/zh/UserGuide/latest-Table/QuickStart/QuickStart_apache.html" aria-label="快速上手"><!---->快速上手<!----></a></li><li><section class="vp-sidebar-group"><button class="vp-sidebar-header clickable" type="button"><!----><span class="vp-sidebar-title">安装部署</span><span class="vp-arrow end"></span></button><!----></section></li><li><section class="vp-sidebar-group"><button class="vp-sidebar-header clickable" type="button"><!----><span class="vp-sidebar-title">基础功能</span><span class="vp-arrow end"></span></button><!----></section></li><li><section class="vp-sidebar-group"><button class="vp-sidebar-header clickable" type="button"><!----><span class="vp-sidebar-title">高级功能</span><span class="vp-arrow end"></span></button><!----></section></li><li><section class="vp-sidebar-group"><button class="vp-sidebar-header clickable" type="button"><!----><span class="vp-sidebar-title">AI 能力</span><span class="vp-arrow end"></span></button><!----></section></li><li><section class="vp-sidebar-group"><button class="vp-sidebar-header clickable" type="button"><!----><span class="vp-sidebar-title">工具体系</span><span class="vp-arrow end"></span></button><!----></section></li><li><section class="vp-sidebar-group"><button class="vp-sidebar-header clickable" type="button"><!----><span class="vp-sidebar-title">应用编程接口</span><span class="vp-arrow end"></span></button><!----></section></li><li><section class="vp-sidebar-group"><button class="vp-sidebar-header clickable" type="button"><!----><span class="vp-sidebar-title">生态集成</span><span class="vp-arrow end"></span></button><!----></section></li><li><section class="vp-sidebar-group"><button class="vp-sidebar-header clickable active" type="button"><!----><span class="vp-sidebar-title">SQL手册</span><span class="vp-arrow down"></span></button><ul class="vp-sidebar-links"><li><a class="route-link auto-link vp-sidebar-link" href="/zh/UserGuide/latest-Table/SQL-Manual/QuickStart-Only-Sql_apache.html" aria-label="快速 SQL 体验"><!---->快速 SQL 体验<!----></a></li><li><a class="route-link auto-link vp-sidebar-link" href="/zh/UserGuide/latest-Table/SQL-Manual/SQL-Metadata-Operations_apache.html" aria-label="元数据操作"><!---->元数据操作<!----></a></li><li><a class="route-link auto-link vp-sidebar-link" href="/zh/UserGuide/latest-Table/SQL-Manual/SQL-Data-Addition-Deletion_apache.html" aria-label="数据增删"><!---->数据增删<!----></a></li><li><section class="vp-sidebar-group"><button class="vp-sidebar-header clickable" type="button"><!----><span class="vp-sidebar-title">数据查询</span><span class="vp-arrow end"></span></button><!----></section></li><li><a class="route-link route-link-active auto-link vp-sidebar-link active" href="/zh/UserGuide/latest-Table/SQL-Manual/SQL-Maintenance-Statements_apache.html" aria-label="运维语句"><!---->运维语句<!----></a></li><li><a class="route-link auto-link vp-sidebar-link" href="/zh/UserGuide/latest-Table/SQL-Manual/Identifier.html" aria-label="标识符"><!---->标识符<!----></a></li><li><a class="route-link auto-link vp-sidebar-link" href="/zh/UserGuide/latest-Table/SQL-Manual/Keywords.html" aria-label="保留字&amp;关键字"><!---->保留字&amp;关键字<!----></a></li><li><section class="vp-sidebar-group"><button class="vp-sidebar-header clickable" type="button"><!----><span class="vp-sidebar-title">函数与操作符</span><span class="vp-arrow end"></span></button><!----></section></li></ul></section></li><li><section class="vp-sidebar-group"><button class="vp-sidebar-header clickable" type="button"><!----><span class="vp-sidebar-title">技术内幕</span><span class="vp-arrow end"></span></button><!----></section></li><li><section class="vp-sidebar-group"><button class="vp-sidebar-header clickable" type="button"><!----><span class="vp-sidebar-title">附录</span><span class="vp-arrow end"></span></button><!----></section></li><li><section class="vp-sidebar-group"><button class="vp-sidebar-header clickable" type="button"><!----><span class="vp-sidebar-title">FAQ</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><!---->运维语句</h1><div class="page-info"><!----><!----><span class="page-date-info" aria-label="写作日期📅" data-balloon-pos="up"><svg xmlns="http://www.w3.org/2000/svg" class="icon calendar-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="calendar icon" name="calendar"><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 data-allow-mismatch="text">2025/2/18</span><meta property="datePublished" content="2025-02-18T02:34:07.000Z"></span><!----><span class="page-reading-time-info" aria-label="阅读时间⌛" data-balloon-pos="up"><svg xmlns="http://www.w3.org/2000/svg" class="icon timer-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="timer icon" name="timer"><path d="M799.387 122.15c4.402-2.978 7.38-7.897 7.38-13.463v-1.165c0-8.933-7.38-16.312-16.312-16.312H256.33c-8.933 0-16.311 7.38-16.311 16.312v1.165c0 5.825 2.977 10.874 7.637 13.592 4.143 194.44 97.22 354.963 220.201 392.763-122.204 37.542-214.893 196.511-220.2 389.397-4.661 5.049-7.638 11.651-7.638 19.03v5.825h566.49v-5.825c0-7.379-2.849-13.981-7.509-18.9-5.049-193.016-97.867-351.985-220.2-389.527 123.24-37.67 216.446-198.453 220.588-392.892zM531.16 450.445v352.632c117.674 1.553 211.787 40.778 211.787 88.676H304.097c0-48.286 95.149-87.382 213.728-88.676V450.445c-93.077-3.107-167.901-81.297-167.901-177.093 0-8.803 6.99-15.793 15.793-15.793 8.803 0 15.794 6.99 15.794 15.793 0 80.261 63.69 145.635 142.01 145.635s142.011-65.374 142.011-145.635c0-8.803 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 5 分钟</span><meta property="timeRequired" content="PT5M"></span><!----><!----></div><hr></div><!----><div class="" vp-content><!----><div id="markdown-content"><h1 id="运维语句" tabindex="-1"><a class="header-anchor" href="#运维语句"><span>运维语句</span></a></h1><h2 id="_1-状态查看" tabindex="-1"><a class="header-anchor" href="#_1-状态查看"><span>1. 状态查看</span></a></h2><h3 id="_1-1-查看当前的树-表模型" tabindex="-1"><a class="header-anchor" href="#_1-1-查看当前的树-表模型"><span>1.1 查看当前的树/表模型</span></a></h3><p><strong>语法：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">showCurrentSqlDialectStatement</span></span>
<span class="line"><span style="color:#ABB2BF;"> : SHOW CURRENT_SQL_DIALECT</span></span>
<span class="line"><span style="color:#ABB2BF;"> ;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p><strong>示例：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#ABB2BF;"> SHOW CURRENT_SQL_DIALECT</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|CurrentSqlDialect|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">TABLE</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><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><h3 id="_1-2-查看登录的用户名" tabindex="-1"><a class="header-anchor" href="#_1-2-查看登录的用户名"><span>1.2 查看登录的用户名</span></a></h3><p><strong>语法：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">showCurrentUserStatement</span></span>
<span class="line"><span style="color:#ABB2BF;"> : SHOW CURRENT_USER</span></span>
<span class="line"><span style="color:#ABB2BF;"> ;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p><strong>示例：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#ABB2BF;"> SHOW CURRENT_USER</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|CurrentUser|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">root</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><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><h3 id="_1-3-查看连接的数据库名" tabindex="-1"><a class="header-anchor" href="#_1-3-查看连接的数据库名"><span>1.3 查看连接的数据库名</span></a></h3><p><strong>语法：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">showCurrentDatabaseStatement</span></span>
<span class="line"><span style="color:#ABB2BF;"> : SHOW CURRENT_DATABASE</span></span>
<span class="line"><span style="color:#ABB2BF;"> ;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p><strong>示例：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#ABB2BF;"> SHOW CURRENT_DATABASE;</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">---------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|CurrentDatabase|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">---------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">---------------+</span></span>
<span class="line"></span>
<span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> USE</span><span style="color:#ABB2BF;"> test;</span></span>
<span class="line"></span>
<span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#ABB2BF;"> SHOW CURRENT_DATABASE;</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">---------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|CurrentDatabase|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">---------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| test|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">---------------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><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 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><h3 id="_1-4-查看集群版本" tabindex="-1"><a class="header-anchor" href="#_1-4-查看集群版本"><span>1.4 查看集群版本</span></a></h3><p><strong>语法：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">showVersionStatement</span></span>
<span class="line"><span style="color:#ABB2BF;"> : SHOW </span><span style="color:#C678DD;">VERSION</span></span>
<span class="line"><span style="color:#ABB2BF;"> ;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p><strong>示例：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#ABB2BF;"> SHOW </span><span style="color:#C678DD;">VERSION</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-------+---------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|</span><span style="color:#C678DD;">Version</span><span style="color:#ABB2BF;">|BuildInfo|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-------+---------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|</span><span style="color:#D19A66;">2</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">2</span><span style="color:#ABB2BF;">| 1ca4008|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-------+---------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><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><h3 id="_1-5-查看集群关键参数" tabindex="-1"><a class="header-anchor" href="#_1-5-查看集群关键参数"><span>1.5 查看集群关键参数</span></a></h3><p><strong>语法：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">showVariablesStatement</span></span>
<span class="line"><span style="color:#ABB2BF;"> : SHOW VARIABLES</span></span>
<span class="line"><span style="color:#ABB2BF;"> ;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p><strong>示例：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#ABB2BF;"> SHOW VARIABLES</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">----------------------------------+-----------------------------------------------------------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| Variable| </span><span style="color:#C678DD;">Value</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">----------------------------------+-----------------------------------------------------------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| ClusterName| defaultCluster|</span></span>
<span class="line"><span style="color:#ABB2BF;">| DataReplicationFactor| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| SchemaReplicationFactor| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| DataRegionConsensusProtocolClass| </span><span style="color:#D19A66;">org</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">apache</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">iotdb</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">consensus</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">iot</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">IoTConsensus</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">|SchemaRegionConsensusProtocolClass| </span><span style="color:#D19A66;">org</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">apache</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">iotdb</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">consensus</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">ratis</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">RatisConsensus</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| ConfigNodeConsensusProtocolClass| </span><span style="color:#D19A66;">org</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">apache</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">iotdb</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">consensus</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">ratis</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">RatisConsensus</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| TimePartitionOrigin| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| TimePartitionInterval| </span><span style="color:#D19A66;">604800000</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| ReadConsistencyLevel| strong|</span></span>
<span class="line"><span style="color:#ABB2BF;">| SchemaRegionPerDataNode| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| DataRegionPerDataNode| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| SeriesSlotNum| </span><span style="color:#D19A66;">1000</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| SeriesSlotExecutorClass|</span><span style="color:#D19A66;">org</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">apache</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">iotdb</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">commons</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">partition</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">executor</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">hash</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">BKDRHashExecutor</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| DiskSpaceWarningThreshold| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">05</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| TimestampPrecision| ms|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">----------------------------------+-----------------------------------------------------------------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><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 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 class="line-number"></div><div class="line-number"></div></div></div><h3 id="_1-6-查看集群id" tabindex="-1"><a class="header-anchor" href="#_1-6-查看集群id"><span>1.6 查看集群ID</span></a></h3><p><strong>语法：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">showClusterIdStatement</span></span>
<span class="line"><span style="color:#ABB2BF;"> : SHOW (CLUSTERID | CLUSTER_ID)</span></span>
<span class="line"><span style="color:#ABB2BF;"> ;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p><strong>示例：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#ABB2BF;"> SHOW CLUSTER_ID</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">------------------------------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| ClusterId|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">------------------------------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|</span><span style="color:#D19A66;">40163007</span><span style="color:#ABB2BF;">-9ec1-</span><span style="color:#D19A66;">4455</span><span style="color:#ABB2BF;">-aa36-8055d740fcda|</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><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><h3 id="_1-7-查看服务器的时间" tabindex="-1"><a class="header-anchor" href="#_1-7-查看服务器的时间"><span>1.7 查看服务器的时间</span></a></h3><p>查看客户端直连的 DataNode 进程所在的服务器的时间</p><p><strong>语法：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">showCurrentTimestampStatement</span></span>
<span class="line"><span style="color:#ABB2BF;"> : SHOW CURRENT_TIMESTAMP</span></span>
<span class="line"><span style="color:#ABB2BF;"> ;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p><strong>示例：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#ABB2BF;"> SHOW CURRENT_TIMESTAMP</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------------------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| CurrentTimestamp|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------------------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|</span><span style="color:#D19A66;">2025</span><span style="color:#ABB2BF;">-</span><span style="color:#D19A66;">02</span><span style="color:#ABB2BF;">-17T11:</span><span style="color:#D19A66;">11</span><span style="color:#ABB2BF;">:</span><span style="color:#D19A66;">52</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">987</span><span style="color:#ABB2BF;">+</span><span style="color:#D19A66;">08</span><span style="color:#ABB2BF;">:</span><span style="color:#D19A66;">00</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------------------------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><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><h3 id="_1-8-查看分区信息" tabindex="-1"><a class="header-anchor" href="#_1-8-查看分区信息"><span>1.8 查看分区信息</span></a></h3><p><strong>含义</strong>：返回当前集群的分区信息。</p><h4 id="语法" tabindex="-1"><a class="header-anchor" href="#语法"><span>语法：</span></a></h4><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">showRegionsStatement</span></span>
<span class="line"><span style="color:#ABB2BF;"> : SHOW REGIONS</span></span>
<span class="line"><span style="color:#ABB2BF;"> ;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h4 id="示例" tabindex="-1"><a class="header-anchor" href="#示例"><span>示例：</span></a></h4><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#ABB2BF;"> SHOW REGIONS</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><p>执行结果如下：</p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">--------+------------+-------+----------+-------------+-----------+----------+----------+-------+---------------+------+-----------------------+----------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|RegionId| </span><span style="color:#C678DD;">Type</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">Status</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">Database</span><span style="color:#ABB2BF;">|SeriesSlotNum|TimeSlotNum|DataNodeId|RpcAddress|RpcPort|InternalAddress| </span><span style="color:#C678DD;">Role</span><span style="color:#ABB2BF;">| CreateTime|TsFileSize|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">--------+------------+-------+----------+-------------+-----------+----------+----------+-------+---------------+------+-----------------------+----------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">6</span><span style="color:#ABB2BF;">|SchemaRegion|Running|tcollector| </span><span style="color:#D19A66;">670</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">6667</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">127</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|Leader|</span><span style="color:#D19A66;">2025</span><span style="color:#ABB2BF;">-</span><span style="color:#D19A66;">08</span><span style="color:#ABB2BF;">-01T17:</span><span style="color:#D19A66;">37</span><span style="color:#ABB2BF;">:</span><span style="color:#D19A66;">01</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">194</span><span style="color:#ABB2BF;">| |</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">7</span><span style="color:#ABB2BF;">| DataRegion|Running|tcollector| </span><span style="color:#D19A66;">335</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">335</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">6667</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">127</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|Leader|</span><span style="color:#D19A66;">2025</span><span style="color:#ABB2BF;">-</span><span style="color:#D19A66;">08</span><span style="color:#ABB2BF;">-01T17:</span><span style="color:#D19A66;">37</span><span style="color:#ABB2BF;">:</span><span style="color:#D19A66;">01</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">196</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">169</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">85</span><span style="color:#ABB2BF;"> KB|</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">8</span><span style="color:#ABB2BF;">| DataRegion|Running|tcollector| </span><span style="color:#D19A66;">335</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">335</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">6667</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">127</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|Leader|</span><span style="color:#D19A66;">2025</span><span style="color:#ABB2BF;">-</span><span style="color:#D19A66;">08</span><span style="color:#ABB2BF;">-01T17:</span><span style="color:#D19A66;">37</span><span style="color:#ABB2BF;">:</span><span style="color:#D19A66;">01</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">198</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">161</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">63</span><span style="color:#ABB2BF;"> KB|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">--------+------------+-------+----------+-------------+-----------+----------+----------+-------+---------------+------+-----------------------+----------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><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><h3 id="_1-9-查看可用节点" tabindex="-1"><a class="header-anchor" href="#_1-9-查看可用节点"><span>1.9 查看可用节点</span></a></h3><p><strong>含义</strong>：返回当前集群所有可用的 DataNode 的 RPC 地址和端口。注意：这里对于“可用”的定义为：处于非 REMOVING 状态的 DN 节点。</p><blockquote><p>V2.0.8 起支持该功能</p></blockquote><h4 id="语法-1" tabindex="-1"><a class="header-anchor" href="#语法-1"><span>语法：</span></a></h4><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">showAvailableUrlsStatement</span></span>
<span class="line"><span style="color:#ABB2BF;"> : SHOW AVAILABLE URLS</span></span>
<span class="line"><span style="color:#ABB2BF;"> ;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h4 id="示例-1" tabindex="-1"><a class="header-anchor" href="#示例-1"><span>示例：</span></a></h4><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#ABB2BF;"> SHOW AVAILABLE URLS</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><p>执行结果如下：</p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">----------+-------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|RpcAddress|RpcPort|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">----------+-------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">6667</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">----------+-------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><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="_2-状态设置" tabindex="-1"><a class="header-anchor" href="#_2-状态设置"><span>2. 状态设置</span></a></h2><h3 id="_2-1-设置连接的树-表模型" tabindex="-1"><a class="header-anchor" href="#_2-1-设置连接的树-表模型"><span>2.1 设置连接的树/表模型</span></a></h3><p><strong>语法：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#C678DD;">SET</span><span style="color:#ABB2BF;"> SQL_DIALECT EQ (</span><span style="color:#C678DD;">TABLE</span><span style="color:#ABB2BF;"> | TREE)</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><p><strong>示例：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> SET</span><span style="color:#ABB2BF;"> SQL_DIALECT</span><span style="color:#56B6C2;">=</span><span style="color:#C678DD;">TABLE</span></span>
<span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#ABB2BF;"> SHOW CURRENT_SQL_DIALECT</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|CurrentSqlDialect|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">TABLE</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><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><h3 id="_2-2-更新配置项" tabindex="-1"><a class="header-anchor" href="#_2-2-更新配置项"><span>2.2 更新配置项</span></a></h3><p><strong>语法：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">setConfigurationStatement</span></span>
<span class="line"><span style="color:#ABB2BF;"> : </span><span style="color:#C678DD;">SET</span><span style="color:#C678DD;"> CONFIGURATION</span><span style="color:#ABB2BF;"> propertyAssignments (</span><span style="color:#C678DD;">ON</span><span style="color:#ABB2BF;"> INTEGER_VALUE)?</span></span>
<span class="line"><span style="color:#ABB2BF;"> ;</span></span>
<span class="line"></span>
<span class="line"><span style="color:#ABB2BF;">propertyAssignments</span></span>
<span class="line"><span style="color:#ABB2BF;"> : property (</span><span style="color:#98C379;">&#39;,&#39;</span><span style="color:#ABB2BF;"> property)*</span></span>
<span class="line"><span style="color:#ABB2BF;"> ;</span></span>
<span class="line"><span style="color:#ABB2BF;"> </span></span>
<span class="line"><span style="color:#ABB2BF;">property</span></span>
<span class="line"><span style="color:#ABB2BF;"> : identifier EQ propertyValue</span></span>
<span class="line"><span style="color:#ABB2BF;"> ;</span></span>
<span class="line"></span>
<span class="line"><span style="color:#ABB2BF;">propertyValue</span></span>
<span class="line"><span style="color:#ABB2BF;"> : </span><span style="color:#C678DD;">DEFAULT</span></span>
<span class="line"><span style="color:#ABB2BF;"> | expression</span></span>
<span class="line"><span style="color:#ABB2BF;"> ;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><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 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><p><strong>示例：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> SET</span><span style="color:#C678DD;"> CONFIGURATION</span><span style="color:#ABB2BF;"> disk_space_warning_threshold</span><span style="color:#56B6C2;">=</span><span style="color:#98C379;">&#39;0.05&#39;</span><span style="color:#ABB2BF;">,heartbeat_interval_in_ms</span><span style="color:#56B6C2;">=</span><span style="color:#98C379;">&#39;1000&#39;</span><span style="color:#C678DD;"> ON</span><span style="color:#D19A66;"> 1</span><span style="color:#ABB2BF;">;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><h3 id="_2-3-读取手动修改的配置文件" tabindex="-1"><a class="header-anchor" href="#_2-3-读取手动修改的配置文件"><span>2.3 读取手动修改的配置文件</span></a></h3><p><strong>语法：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">loadConfigurationStatement</span></span>
<span class="line"><span style="color:#ABB2BF;"> : </span><span style="color:#C678DD;">LOAD</span><span style="color:#C678DD;"> CONFIGURATION</span><span style="color:#ABB2BF;"> localOrClusterMode?</span></span>
<span class="line"><span style="color:#ABB2BF;"> ;</span></span>
<span class="line"><span style="color:#ABB2BF;"> </span></span>
<span class="line"><span style="color:#ABB2BF;">localOrClusterMode</span></span>
<span class="line"><span style="color:#ABB2BF;"> : (</span><span style="color:#C678DD;">ON</span><span style="color:#ABB2BF;"> (</span><span style="color:#C678DD;">LOCAL</span><span style="color:#ABB2BF;"> | CLUSTER))</span></span>
<span class="line"><span style="color:#ABB2BF;"> ;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><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><p><strong>示例：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> LOAD</span><span style="color:#C678DD;"> CONFIGURATION</span><span style="color:#C678DD;"> ON</span><span style="color:#C678DD;"> LOCAL</span><span style="color:#ABB2BF;">;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><h3 id="_2-4-设置系统的状态" tabindex="-1"><a class="header-anchor" href="#_2-4-设置系统的状态"><span>2.4 设置系统的状态</span></a></h3><p><strong>语法：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">setSystemStatusStatement</span></span>
<span class="line"><span style="color:#ABB2BF;"> : </span><span style="color:#C678DD;">SET</span><span style="color:#C678DD;"> SYSTEM</span><span style="color:#C678DD;"> TO</span><span style="color:#ABB2BF;"> (</span><span style="color:#C678DD;">READONLY</span><span style="color:#ABB2BF;"> | RUNNING) localOrClusterMode?</span></span>
<span class="line"><span style="color:#ABB2BF;"> ; </span></span>
<span class="line"><span style="color:#ABB2BF;"> </span></span>
<span class="line"><span style="color:#ABB2BF;">localOrClusterMode</span></span>
<span class="line"><span style="color:#ABB2BF;"> : (</span><span style="color:#C678DD;">ON</span><span style="color:#ABB2BF;"> (</span><span style="color:#C678DD;">LOCAL</span><span style="color:#ABB2BF;"> | CLUSTER))</span></span>
<span class="line"><span style="color:#ABB2BF;"> ;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><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><p><strong>示例：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> SET</span><span style="color:#C678DD;"> SYSTEM</span><span style="color:#C678DD;"> TO</span><span style="color:#C678DD;"> READONLY</span><span style="color:#C678DD;"> ON</span><span style="color:#ABB2BF;"> CLUSTER;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><h2 id="_3-数据管理" tabindex="-1"><a class="header-anchor" href="#_3-数据管理"><span>3. 数据管理</span></a></h2><h3 id="_3-1-将内存表中的数据刷到磁盘" tabindex="-1"><a class="header-anchor" href="#_3-1-将内存表中的数据刷到磁盘"><span>3.1 将内存表中的数据刷到磁盘</span></a></h3><p><strong>语法：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">flushStatement</span></span>
<span class="line"><span style="color:#ABB2BF;"> : FLUSH identifier? (</span><span style="color:#98C379;">&#39;,&#39;</span><span style="color:#ABB2BF;"> identifier)* booleanValue? localOrClusterMode?</span></span>
<span class="line"><span style="color:#ABB2BF;"> ;</span></span>
<span class="line"></span>
<span class="line"><span style="color:#ABB2BF;">booleanValue</span></span>
<span class="line"><span style="color:#ABB2BF;"> : TRUE | FALSE</span></span>
<span class="line"><span style="color:#ABB2BF;"> ;</span></span>
<span class="line"></span>
<span class="line"><span style="color:#ABB2BF;">localOrClusterMode</span></span>
<span class="line"><span style="color:#ABB2BF;"> : (</span><span style="color:#C678DD;">ON</span><span style="color:#ABB2BF;"> (</span><span style="color:#C678DD;">LOCAL</span><span style="color:#ABB2BF;"> | CLUSTER))</span></span>
<span class="line"><span style="color:#ABB2BF;"> ;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><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 class="line-number"></div><div class="line-number"></div></div></div><p><strong>示例：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#ABB2BF;"> FLUSH test_db TRUE </span><span style="color:#C678DD;">ON</span><span style="color:#C678DD;"> LOCAL</span><span style="color:#ABB2BF;">;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><h3 id="_3-2-清除-datanode-上的缓存" tabindex="-1"><a class="header-anchor" href="#_3-2-清除-datanode-上的缓存"><span>3.2 清除 DataNode 上的缓存</span></a></h3><p><strong>语法：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">clearCacheStatement</span></span>
<span class="line"><span style="color:#ABB2BF;"> : </span><span style="color:#C678DD;">CLEAR</span><span style="color:#ABB2BF;"> clearCacheOptions? CACHE localOrClusterMode?</span></span>
<span class="line"><span style="color:#ABB2BF;"> ;</span></span>
<span class="line"></span>
<span class="line"><span style="color:#ABB2BF;">clearCacheOptions</span></span>
<span class="line"><span style="color:#ABB2BF;"> : ATTRIBUTE</span></span>
<span class="line"><span style="color:#ABB2BF;"> | QUERY</span></span>
<span class="line"><span style="color:#ABB2BF;"> | ALL</span></span>
<span class="line"><span style="color:#ABB2BF;"> ;</span></span>
<span class="line"></span>
<span class="line"><span style="color:#ABB2BF;">localOrClusterMode</span></span>
<span class="line"><span style="color:#ABB2BF;"> : (</span><span style="color:#C678DD;">ON</span><span style="color:#ABB2BF;"> (</span><span style="color:#C678DD;">LOCAL</span><span style="color:#ABB2BF;"> | CLUSTER))</span></span>
<span class="line"><span style="color:#ABB2BF;"> ;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><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 class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p><strong>示例：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> CLEAR</span><span style="color:#ABB2BF;"> ALL CACHE </span><span style="color:#C678DD;">ON</span><span style="color:#C678DD;"> LOCAL</span><span style="color:#ABB2BF;">;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><h2 id="_4-数据修复" tabindex="-1"><a class="header-anchor" href="#_4-数据修复"><span>4. 数据修复</span></a></h2><h3 id="_4-1-启动后台扫描并修复-tsfile-任务" tabindex="-1"><a class="header-anchor" href="#_4-1-启动后台扫描并修复-tsfile-任务"><span>4.1 启动后台扫描并修复 tsfile 任务</span></a></h3><p><strong>语法：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">startRepairDataStatement</span></span>
<span class="line"><span style="color:#ABB2BF;"> : </span><span style="color:#C678DD;">START</span><span style="color:#ABB2BF;"> REPAIR </span><span style="color:#C678DD;">DATA</span><span style="color:#ABB2BF;"> localOrClusterMode?</span></span>
<span class="line"><span style="color:#ABB2BF;"> ;</span></span>
<span class="line"><span style="color:#ABB2BF;"> </span></span>
<span class="line"><span style="color:#ABB2BF;">localOrClusterMode</span></span>
<span class="line"><span style="color:#ABB2BF;"> : (</span><span style="color:#C678DD;">ON</span><span style="color:#ABB2BF;"> (</span><span style="color:#C678DD;">LOCAL</span><span style="color:#ABB2BF;"> | CLUSTER))</span></span>
<span class="line"><span style="color:#ABB2BF;"> ;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><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><p><strong>示例：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> START</span><span style="color:#ABB2BF;"> REPAIR </span><span style="color:#C678DD;">DATA</span><span style="color:#C678DD;"> ON</span><span style="color:#ABB2BF;"> CLUSTER;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><h3 id="_4-2-暂停后台修复-tsfile-任务" tabindex="-1"><a class="header-anchor" href="#_4-2-暂停后台修复-tsfile-任务"><span>4.2 暂停后台修复 tsfile 任务</span></a></h3><p><strong>语法：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">stopRepairDataStatement</span></span>
<span class="line"><span style="color:#ABB2BF;"> : </span><span style="color:#C678DD;">STOP</span><span style="color:#ABB2BF;"> REPAIR </span><span style="color:#C678DD;">DATA</span><span style="color:#ABB2BF;"> localOrClusterMode?</span></span>
<span class="line"><span style="color:#ABB2BF;"> ;</span></span>
<span class="line"><span style="color:#ABB2BF;"> </span></span>
<span class="line"><span style="color:#ABB2BF;">localOrClusterMode</span></span>
<span class="line"><span style="color:#ABB2BF;"> : (</span><span style="color:#C678DD;">ON</span><span style="color:#ABB2BF;"> (</span><span style="color:#C678DD;">LOCAL</span><span style="color:#ABB2BF;"> | CLUSTER))</span></span>
<span class="line"><span style="color:#ABB2BF;"> ;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><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><p><strong>示例：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> STOP</span><span style="color:#ABB2BF;"> REPAIR </span><span style="color:#C678DD;">DATA</span><span style="color:#C678DD;"> ON</span><span style="color:#ABB2BF;"> CLUSTER;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><h2 id="_5-查询相关" tabindex="-1"><a class="header-anchor" href="#_5-查询相关"><span>5. 查询相关</span></a></h2><h3 id="_5-1-查看正在执行的查询" tabindex="-1"><a class="header-anchor" href="#_5-1-查看正在执行的查询"><span>5.1 查看正在执行的查询</span></a></h3><p><strong>语法：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">showQueriesStatement</span></span>
<span class="line"><span style="color:#ABB2BF;"> : SHOW (QUERIES | QUERY PROCESSLIST)</span></span>
<span class="line"><span style="color:#ABB2BF;"> (</span><span style="color:#C678DD;">WHERE</span><span style="color:#C678DD;"> where</span><span style="color:#56B6C2;">=</span><span style="color:#ABB2BF;">booleanExpression)?</span></span>
<span class="line"><span style="color:#ABB2BF;"> (</span><span style="color:#C678DD;">ORDER BY</span><span style="color:#ABB2BF;"> sortItem (</span><span style="color:#98C379;">&#39;,&#39;</span><span style="color:#ABB2BF;"> sortItem)*)?</span></span>
<span class="line"><span style="color:#ABB2BF;"> limitOffsetClause</span></span>
<span class="line"><span style="color:#ABB2BF;"> ;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><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><p><strong>示例：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#ABB2BF;"> SHOW QUERIES </span><span style="color:#C678DD;">WHERE</span><span style="color:#ABB2BF;"> elapsed_time </span><span style="color:#56B6C2;">&gt;</span><span style="color:#D19A66;"> 30</span><span style="color:#ABB2BF;"> </span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------------------+-----------------------------+-----------+------------+------------+----+</span></span>
<span class="line"><span style="color:#ABB2BF;">| query_id| start_time|datanode_id|elapsed_time| </span><span style="color:#C678DD;">statement</span><span style="color:#ABB2BF;">|user|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------------------+-----------------------------+-----------+------------+------------+----+</span></span>
<span class="line"><span style="color:#ABB2BF;">|20250108_101015_00000_1|</span><span style="color:#D19A66;">2025</span><span style="color:#ABB2BF;">-</span><span style="color:#D19A66;">01</span><span style="color:#ABB2BF;">-08T18:</span><span style="color:#D19A66;">10</span><span style="color:#ABB2BF;">:</span><span style="color:#D19A66;">15</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">935</span><span style="color:#ABB2BF;">+</span><span style="color:#D19A66;">08</span><span style="color:#ABB2BF;">:</span><span style="color:#D19A66;">00</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">32</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">283</span><span style="color:#ABB2BF;">|show queries|</span><span style="color:#C678DD;">root</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------------------+-----------------------------+-----------+------------+------------+----+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><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><h3 id="_5-2-主动终止查询" tabindex="-1"><a class="header-anchor" href="#_5-2-主动终止查询"><span>5.2 主动终止查询</span></a></h3><p><strong>语法：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">killQueryStatement</span></span>
<span class="line"><span style="color:#ABB2BF;"> : </span><span style="color:#C678DD;">KILL</span><span style="color:#ABB2BF;"> (QUERY queryId</span><span style="color:#56B6C2;">=</span><span style="color:#ABB2BF;">string | ALL QUERIES)</span></span>
<span class="line"><span style="color:#ABB2BF;"> ;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p><strong>示例：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> KILL</span><span style="color:#ABB2BF;"> QUERY 20250108_101015_00000_1; </span><span style="color:#7F848E;font-style:italic;">-- 终止指定query</span></span>
<span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> KILL</span><span style="color:#ABB2BF;"> ALL QUERIES; </span><span style="color:#7F848E;font-style:italic;">-- 终止所有query</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="_5-3-查询性能分析" tabindex="-1"><a class="header-anchor" href="#_5-3-查询性能分析"><span>5.3 查询性能分析</span></a></h3><h4 id="_5-3-1-查看执行计划" tabindex="-1"><a class="header-anchor" href="#_5-3-1-查看执行计划"><span>5.3.1 查看执行计划</span></a></h4><p><strong>语法：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">EXPLAIN </span><span style="color:#56B6C2;">&lt;</span><span style="color:#ABB2BF;">SELECT_STATEMENT</span><span style="color:#56B6C2;">&gt;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><p>更多详细语法说明请参考：<a class="route-link" href="/zh/UserGuide/latest-Table/User-Manual/Query-Performance-Analysis.html#_1-explain-%E8%AF%AD%E5%8F%A5">EXPLAIN 语句</a></p><p><strong>示例：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#ABB2BF;"> explain </span><span style="color:#C678DD;">select</span><span style="color:#ABB2BF;"> * </span><span style="color:#C678DD;">from</span><span style="color:#ABB2BF;"> t1</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------------------------------------------------------------------------------------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">distribution</span><span style="color:#ABB2BF;"> plan|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------------------------------------------------------------------------------------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| ┌─────────────────────────────────────────────┐ |</span></span>
<span class="line"><span style="color:#ABB2BF;">| │OutputNode-</span><span style="color:#D19A66;">4</span><span style="color:#ABB2BF;"> │ |</span></span>
<span class="line"><span style="color:#ABB2BF;">| │OutputColumns-</span><span style="color:#E06C75;">[time, device_id, type, speed]</span><span style="color:#ABB2BF;"> │ |</span></span>
<span class="line"><span style="color:#ABB2BF;">| │OutputSymbols: </span><span style="color:#E06C75;">[time, device_id, type, speed]</span><span style="color:#ABB2BF;">│ |</span></span>
<span class="line"><span style="color:#ABB2BF;">| └─────────────────────────────────────────────┘ |</span></span>
<span class="line"><span style="color:#ABB2BF;">| │ |</span></span>
<span class="line"><span style="color:#ABB2BF;">| │ |</span></span>
<span class="line"><span style="color:#ABB2BF;">| ┌─────────────────────────────────────────────┐ |</span></span>
<span class="line"><span style="color:#ABB2BF;">| │Collect-</span><span style="color:#D19A66;">21</span><span style="color:#ABB2BF;"> │ |</span></span>
<span class="line"><span style="color:#ABB2BF;">| │OutputSymbols: </span><span style="color:#E06C75;">[time, device_id, type, speed]</span><span style="color:#ABB2BF;">│ |</span></span>
<span class="line"><span style="color:#ABB2BF;">| └─────────────────────────────────────────────┘ |</span></span>
<span class="line"><span style="color:#ABB2BF;">| ┌───────────────────────┴───────────────────────┐ |</span></span>
<span class="line"><span style="color:#ABB2BF;">| │ │ |</span></span>
<span class="line"><span style="color:#ABB2BF;">|┌─────────────────────────────────────────────┐ ┌───────────┐ |</span></span>
<span class="line"><span style="color:#ABB2BF;">|│TableScan-</span><span style="color:#D19A66;">19</span><span style="color:#ABB2BF;"> │ │Exchange-</span><span style="color:#D19A66;">28</span><span style="color:#ABB2BF;">│ |</span></span>
<span class="line"><span style="color:#ABB2BF;">|│QualifiedTableName: </span><span style="color:#D19A66;">test</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">t1</span><span style="color:#ABB2BF;"> │ └───────────┘ |</span></span>
<span class="line"><span style="color:#ABB2BF;">|│OutputSymbols: </span><span style="color:#E06C75;">[time, device_id, type, speed]</span><span style="color:#ABB2BF;">│ │ |</span></span>
<span class="line"><span style="color:#ABB2BF;">|│DeviceNumber: </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;"> │ │ |</span></span>
<span class="line"><span style="color:#ABB2BF;">|│ScanOrder: </span><span style="color:#C678DD;">ASC</span><span style="color:#ABB2BF;"> │ ┌─────────────────────────────────────────────┐|</span></span>
<span class="line"><span style="color:#ABB2BF;">|│PushDownOffset: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;"> │ │TableScan-</span><span style="color:#D19A66;">20</span><span style="color:#ABB2BF;"> │|</span></span>
<span class="line"><span style="color:#ABB2BF;">|│PushDownLimit: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;"> │ │QualifiedTableName: </span><span style="color:#D19A66;">test</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">t1</span><span style="color:#ABB2BF;"> │|</span></span>
<span class="line"><span style="color:#ABB2BF;">|│PushDownLimitToEachDevice: false │ │OutputSymbols: </span><span style="color:#E06C75;">[time, device_id, type, speed]</span><span style="color:#ABB2BF;">│|</span></span>
<span class="line"><span style="color:#ABB2BF;">|│RegionId: </span><span style="color:#D19A66;">2</span><span style="color:#ABB2BF;"> │ │DeviceNumber: </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;"> │|</span></span>
<span class="line"><span style="color:#ABB2BF;">|└─────────────────────────────────────────────┘ │ScanOrder: </span><span style="color:#C678DD;">ASC</span><span style="color:#ABB2BF;"> │|</span></span>
<span class="line"><span style="color:#ABB2BF;">| │PushDownOffset: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;"> │|</span></span>
<span class="line"><span style="color:#ABB2BF;">| │PushDownLimit: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;"> │|</span></span>
<span class="line"><span style="color:#ABB2BF;">| │PushDownLimitToEachDevice: false │|</span></span>
<span class="line"><span style="color:#ABB2BF;">| │RegionId: </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;"> │|</span></span>
<span class="line"><span style="color:#ABB2BF;">| └─────────────────────────────────────────────┘|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------------------------------------------------------------------------------------------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><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 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 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 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="_5-3-2-查询性能分析" tabindex="-1"><a class="header-anchor" href="#_5-3-2-查询性能分析"><span>5.3.2 查询性能分析</span></a></h4><p><strong>语法：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">EXPLAIN ANALYZE </span><span style="color:#E06C75;">[VERBOSE]</span><span style="color:#56B6C2;"> &lt;</span><span style="color:#ABB2BF;">SELECT_STATEMENT</span><span style="color:#56B6C2;">&gt;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><p>更多详细语法说明请参考：<a class="route-link" href="/zh/UserGuide/latest-Table/User-Manual/Query-Performance-Analysis.html#_2-explain-analyze-%E8%AF%AD%E5%8F%A5">EXPLAIN ANALYZE 语句</a></p><p><strong>示例：</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#ABB2BF;"> explain analyze </span><span style="color:#C678DD;">verbose</span><span style="color:#C678DD;"> select</span><span style="color:#ABB2BF;"> * </span><span style="color:#C678DD;">from</span><span style="color:#ABB2BF;"> t1</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------------------------------------------------------------------------------------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| Explain Analyze|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------------------------------------------------------------------------------------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|Analyze Cost: </span><span style="color:#D19A66;">38</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">860</span><span style="color:#ABB2BF;"> ms |</span></span>
<span class="line"><span style="color:#ABB2BF;">|</span><span style="color:#C678DD;">Fetch</span><span style="color:#C678DD;"> Partition</span><span style="color:#ABB2BF;"> Cost: </span><span style="color:#D19A66;">9</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">888</span><span style="color:#ABB2BF;"> ms |</span></span>
<span class="line"><span style="color:#ABB2BF;">|</span><span style="color:#C678DD;">Fetch</span><span style="color:#C678DD;"> Schema</span><span style="color:#ABB2BF;"> Cost: </span><span style="color:#D19A66;">54</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">046</span><span style="color:#ABB2BF;"> ms |</span></span>
<span class="line"><span style="color:#ABB2BF;">|Logical Plan Cost: </span><span style="color:#D19A66;">10</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">102</span><span style="color:#ABB2BF;"> ms |</span></span>
<span class="line"><span style="color:#ABB2BF;">|Logical Optimization Cost: </span><span style="color:#D19A66;">17</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">396</span><span style="color:#ABB2BF;"> ms |</span></span>
<span class="line"><span style="color:#ABB2BF;">|</span><span style="color:#C678DD;">Distribution</span><span style="color:#ABB2BF;"> Plan Cost: </span><span style="color:#D19A66;">2</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">508</span><span style="color:#ABB2BF;"> ms |</span></span>
<span class="line"><span style="color:#ABB2BF;">|Dispatch Cost: </span><span style="color:#D19A66;">22</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">126</span><span style="color:#ABB2BF;"> ms |</span></span>
<span class="line"><span style="color:#ABB2BF;">|Fragment Instances Count: </span><span style="color:#D19A66;">2</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| |</span></span>
<span class="line"><span style="color:#ABB2BF;">|FRAGMENT-INSTANCE</span><span style="color:#E06C75;">[Id: 20241127_090849_00009_1.2.0][IP: 0.0.0.0][DataRegion: 2][State: FINISHED]</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| Total Wall </span><span style="color:#C678DD;">Time</span><span style="color:#ABB2BF;">: </span><span style="color:#D19A66;">18</span><span style="color:#ABB2BF;"> ms |</span></span>
<span class="line"><span style="color:#ABB2BF;">| Cost of initDataQuerySource: </span><span style="color:#D19A66;">6</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">153</span><span style="color:#ABB2BF;"> ms |</span></span>
<span class="line"><span style="color:#ABB2BF;">| Seq </span><span style="color:#C678DD;">File</span><span style="color:#ABB2BF;">(unclosed): </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">, Seq </span><span style="color:#C678DD;">File</span><span style="color:#ABB2BF;">(closed): </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| UnSeq </span><span style="color:#C678DD;">File</span><span style="color:#ABB2BF;">(unclosed): </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">, UnSeq </span><span style="color:#C678DD;">File</span><span style="color:#ABB2BF;">(closed): </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| ready queued </span><span style="color:#C678DD;">time</span><span style="color:#ABB2BF;">: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">164</span><span style="color:#ABB2BF;"> ms, blocked queued </span><span style="color:#C678DD;">time</span><span style="color:#ABB2BF;">: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">342</span><span style="color:#ABB2BF;"> ms |</span></span>
<span class="line"><span style="color:#ABB2BF;">| Query </span><span style="color:#C678DD;">Statistics</span><span style="color:#ABB2BF;">: |</span></span>
<span class="line"><span style="color:#ABB2BF;">| loadBloomFilterFromCacheCount: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| loadBloomFilterFromDiskCount: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| loadBloomFilterActualIOSize: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| loadBloomFilterTime: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">000</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| loadTimeSeriesMetadataAlignedMemSeqCount: </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| loadTimeSeriesMetadataAlignedMemSeqTime: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">246</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| loadTimeSeriesMetadataFromCacheCount: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| loadTimeSeriesMetadataFromDiskCount: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| loadTimeSeriesMetadataActualIOSize: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| constructAlignedChunkReadersMemCount: </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| constructAlignedChunkReadersMemTime: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">294</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| loadChunkFromCacheCount: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| loadChunkFromDiskCount: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| loadChunkActualIOSize: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| pageReadersDecodeAlignedMemCount: </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| pageReadersDecodeAlignedMemTime: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">047</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#E06C75;">[PlanNodeId 43]</span><span style="color:#ABB2BF;">: IdentitySinkNode(IdentitySinkOperator) |</span></span>
<span class="line"><span style="color:#ABB2BF;">| CPU </span><span style="color:#C678DD;">Time</span><span style="color:#ABB2BF;">: </span><span style="color:#D19A66;">5</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">523</span><span style="color:#ABB2BF;"> ms |</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">output</span><span style="color:#ABB2BF;">: </span><span style="color:#D19A66;">2</span><span style="color:#C678DD;"> rows</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| HasNext() Called Count: </span><span style="color:#D19A66;">6</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">Next</span><span style="color:#ABB2BF;">() Called Count: </span><span style="color:#D19A66;">5</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| Estimated Memory </span><span style="color:#C678DD;">Size</span><span style="color:#ABB2BF;">: : </span><span style="color:#D19A66;">327680</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#E06C75;">[PlanNodeId 31]</span><span style="color:#ABB2BF;">: CollectNode(CollectOperator) |</span></span>
<span class="line"><span style="color:#ABB2BF;">| CPU </span><span style="color:#C678DD;">Time</span><span style="color:#ABB2BF;">: </span><span style="color:#D19A66;">5</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">512</span><span style="color:#ABB2BF;"> ms |</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">output</span><span style="color:#ABB2BF;">: </span><span style="color:#D19A66;">2</span><span style="color:#C678DD;"> rows</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| HasNext() Called Count: </span><span style="color:#D19A66;">6</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">Next</span><span style="color:#ABB2BF;">() Called Count: </span><span style="color:#D19A66;">5</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| Estimated Memory </span><span style="color:#C678DD;">Size</span><span style="color:#ABB2BF;">: : </span><span style="color:#D19A66;">327680</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#E06C75;">[PlanNodeId 29]</span><span style="color:#ABB2BF;">: TableScanNode(TableScanOperator) |</span></span>
<span class="line"><span style="color:#ABB2BF;">| CPU </span><span style="color:#C678DD;">Time</span><span style="color:#ABB2BF;">: </span><span style="color:#D19A66;">5</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">439</span><span style="color:#ABB2BF;"> ms |</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">output</span><span style="color:#ABB2BF;">: </span><span style="color:#D19A66;">1</span><span style="color:#C678DD;"> rows</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| HasNext() Called Count: </span><span style="color:#D19A66;">3</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">Next</span><span style="color:#ABB2BF;">() Called Count: </span><span style="color:#D19A66;">2</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| Estimated Memory </span><span style="color:#C678DD;">Size</span><span style="color:#ABB2BF;">: : </span><span style="color:#D19A66;">327680</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| DeviceNumber: </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| CurrentDeviceIndex: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#E06C75;">[PlanNodeId 40]</span><span style="color:#ABB2BF;">: ExchangeNode(ExchangeOperator) |</span></span>
<span class="line"><span style="color:#ABB2BF;">| CPU </span><span style="color:#C678DD;">Time</span><span style="color:#ABB2BF;">: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">053</span><span style="color:#ABB2BF;"> ms |</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">output</span><span style="color:#ABB2BF;">: </span><span style="color:#D19A66;">1</span><span style="color:#C678DD;"> rows</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| HasNext() Called Count: </span><span style="color:#D19A66;">2</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">Next</span><span style="color:#ABB2BF;">() Called Count: </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| Estimated Memory </span><span style="color:#C678DD;">Size</span><span style="color:#ABB2BF;">: : </span><span style="color:#D19A66;">131072</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| |</span></span>
<span class="line"><span style="color:#ABB2BF;">|FRAGMENT-INSTANCE</span><span style="color:#E06C75;">[Id: 20241127_090849_00009_1.3.0][IP: 0.0.0.0][DataRegion: 1][State: FINISHED]</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| Total Wall </span><span style="color:#C678DD;">Time</span><span style="color:#ABB2BF;">: </span><span style="color:#D19A66;">13</span><span style="color:#ABB2BF;"> ms |</span></span>
<span class="line"><span style="color:#ABB2BF;">| Cost of initDataQuerySource: </span><span style="color:#D19A66;">5</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">725</span><span style="color:#ABB2BF;"> ms |</span></span>
<span class="line"><span style="color:#ABB2BF;">| Seq </span><span style="color:#C678DD;">File</span><span style="color:#ABB2BF;">(unclosed): </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">, Seq </span><span style="color:#C678DD;">File</span><span style="color:#ABB2BF;">(closed): </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| UnSeq </span><span style="color:#C678DD;">File</span><span style="color:#ABB2BF;">(unclosed): </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">, UnSeq </span><span style="color:#C678DD;">File</span><span style="color:#ABB2BF;">(closed): </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| ready queued </span><span style="color:#C678DD;">time</span><span style="color:#ABB2BF;">: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">118</span><span style="color:#ABB2BF;"> ms, blocked queued </span><span style="color:#C678DD;">time</span><span style="color:#ABB2BF;">: </span><span style="color:#D19A66;">5</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">844</span><span style="color:#ABB2BF;"> ms |</span></span>
<span class="line"><span style="color:#ABB2BF;">| Query </span><span style="color:#C678DD;">Statistics</span><span style="color:#ABB2BF;">: |</span></span>
<span class="line"><span style="color:#ABB2BF;">| loadBloomFilterFromCacheCount: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| loadBloomFilterFromDiskCount: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| loadBloomFilterActualIOSize: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| loadBloomFilterTime: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">000</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| loadTimeSeriesMetadataAlignedMemSeqCount: </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| loadTimeSeriesMetadataAlignedMemSeqTime: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">004</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| loadTimeSeriesMetadataFromCacheCount: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| loadTimeSeriesMetadataFromDiskCount: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| loadTimeSeriesMetadataActualIOSize: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| constructAlignedChunkReadersMemCount: </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| constructAlignedChunkReadersMemTime: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">001</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| loadChunkFromCacheCount: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| loadChunkFromDiskCount: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| loadChunkActualIOSize: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| pageReadersDecodeAlignedMemCount: </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| pageReadersDecodeAlignedMemTime: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">007</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#E06C75;">[PlanNodeId 42]</span><span style="color:#ABB2BF;">: IdentitySinkNode(IdentitySinkOperator) |</span></span>
<span class="line"><span style="color:#ABB2BF;">| CPU </span><span style="color:#C678DD;">Time</span><span style="color:#ABB2BF;">: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">270</span><span style="color:#ABB2BF;"> ms |</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">output</span><span style="color:#ABB2BF;">: </span><span style="color:#D19A66;">1</span><span style="color:#C678DD;"> rows</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| HasNext() Called Count: </span><span style="color:#D19A66;">3</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">Next</span><span style="color:#ABB2BF;">() Called Count: </span><span style="color:#D19A66;">2</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| Estimated Memory </span><span style="color:#C678DD;">Size</span><span style="color:#ABB2BF;">: : </span><span style="color:#D19A66;">327680</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#E06C75;">[PlanNodeId 30]</span><span style="color:#ABB2BF;">: TableScanNode(TableScanOperator) |</span></span>
<span class="line"><span style="color:#ABB2BF;">| CPU </span><span style="color:#C678DD;">Time</span><span style="color:#ABB2BF;">: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">250</span><span style="color:#ABB2BF;"> ms |</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">output</span><span style="color:#ABB2BF;">: </span><span style="color:#D19A66;">1</span><span style="color:#C678DD;"> rows</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| HasNext() Called Count: </span><span style="color:#D19A66;">3</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">Next</span><span style="color:#ABB2BF;">() Called Count: </span><span style="color:#D19A66;">2</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| Estimated Memory </span><span style="color:#C678DD;">Size</span><span style="color:#ABB2BF;">: : </span><span style="color:#D19A66;">327680</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| DeviceNumber: </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">| CurrentDeviceIndex: </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------------------------------------------------------------------------------------------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><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 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 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 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 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 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 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 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 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 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 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 class="line-number"></div><div class="line-number"></div></div></div></div><!----><!----><!----></div><footer class="vp-page-meta"><div class="vp-meta-item edit-link"><a class="auto-link external-link vp-meta-label" href="https://github.com/apache/iotdb-docs/edit/main/src/zh/UserGuide/latest-Table/SQL-Manual/SQL-Maintenance-Statements_apache.md" aria-label="发现错误？在 GitHub 上编辑此页" rel="noopener noreferrer" target="_blank"><!--[--><svg xmlns="http://www.w3.org/2000/svg" class="icon edit-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="edit icon" name="edit"><path d="M430.818 653.65a60.46 60.46 0 0 1-50.96-93.281l71.69-114.012 7.773-10.365L816.038 80.138A60.46 60.46 0 0 1 859.225 62a60.46 60.46 0 0 1 43.186 18.138l43.186 43.186a60.46 60.46 0 0 1 0 86.373L588.879 565.55l-8.637 8.637-117.466 68.234a60.46 60.46 0 0 1-31.958 11.229z"></path><path d="M728.802 962H252.891A190.883 190.883 0 0 1 62.008 771.98V296.934a190.883 190.883 0 0 1 190.883-192.61h267.754a60.46 60.46 0 0 1 0 120.92H252.891a69.962 69.962 0 0 0-69.098 69.099V771.98a69.962 69.962 0 0 0 69.098 69.098h475.911A69.962 69.962 0 0 0 797.9 771.98V503.363a60.46 60.46 0 1 1 120.922 0V771.98A190.883 190.883 0 0 1 728.802 962z"></path></svg><!--]-->发现错误？在 GitHub 上编辑此页<!----></a></div><div class="vp-meta-item git-info"><div class="update-time"><span class="vp-meta-label">最近更新: </span><time class="vp-meta-info" datetime="2026-04-15T10:39:00.000Z" data-allow-mismatch>2026/4/15 10:39</time></div><!----></div></footer><nav class="vp-page-nav"><!----><a class="route-link auto-link next" href="/zh/UserGuide/latest-Table/SQL-Manual/Identifier.html" aria-label="标识符"><div class="hint">下一页<span class="arrow end"></span></div><div class="link">标识符<!----></div></a></nav><!----><!----><!--]--></main><!--]--><footer class="site-footer"><span id="doc-version" style="display:none;">latest-Table</span><p class="copyright-text">版权所有 © 2026 Apache软件基金会。
Apache IoTDB，IoTDB，Apache，Apache 羽毛标志和 Apache IoTDB 项目标志是 Apache 软件基金会在所有国家的注册商标或商标</p><p style="text-align:center;margin-top:10px;color:#909399;font-size:12px;margin:0 30px;"><strong>有问题吗？</strong> 在 QQ、微信或 Slack 上联系我们。 <a href="https://github.com/apache/iotdb/issues/1995">立即加入社区</a></p></footer></div><!--]--><!--]--><!--[--><!----><!--]--><!--]--></div>
<script type="module" src="/assets/app-C4FS647M.js" defer></script>
</body>
</html>