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| <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav> <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>IoTDB用户手册 (V0.12.x)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>IoTDB简介</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>快速上手</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>数据模式与概念</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>SQL命令行终端(CLI)</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>权限管理</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>IoTDB-SQL 语言</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/zh/UserGuide/V0.12.x/IoTDB-SQL-Language/DDL-Data-Definition-Language.html" class="sidebar-link">数据定义语言（DDL）</a></li><li><a href="/zh/UserGuide/V0.12.x/IoTDB-SQL-Language/DML-Data-Manipulation-Language.html" class="sidebar-link">数据操作语言（DML）</a></li><li><a href="/zh/UserGuide/V0.12.x/IoTDB-SQL-Language/Maintenance-Command.html" aria-current="page" class="active sidebar-link">运维命令</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>应用编程接口</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>用户定义函数(UDF)</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>通信服务协议</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>系统工具</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>端云协同</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>系统集成</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>集群搭建</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>常见问题</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>附录</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h2 id="运维命令"><a href="#运维命令" class="header-anchor">#</a> 运维命令</h2> <h3 id="flush"><a href="#flush" class="header-anchor">#</a> FLUSH</h3> <p>将指定存储组的内存缓存区Memory Table的数据持久化到磁盘上，并将数据文件封口。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB> FLUSH |
| IoTDB> FLUSH root.ln |
| IoTDB> FLUSH root.sg1,root.sg2 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><h3 id="merge"><a href="#merge" class="header-anchor">#</a> MERGE</h3> <p>合并顺序和乱序数据。当前IoTDB支持使用如下两种SQL手动触发数据文件的合并：</p> <ul><li><code>MERGE</code> 仅重写重复的Chunk，整理速度快，但是最终磁盘会存在多余数据。</li> <li><code>FULL MERGE</code> 将需要合并的顺序和乱序文件的所有数据都重新写一份，整理速度慢，最终磁盘将不存在无用的数据。</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB> MERGE |
| IoTDB> FULL MERGE |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><h3 id="clear-cache"><a href="#clear-cache" class="header-anchor">#</a> CLEAR CACHE</h3> <p>手动清除chunk, chunk metadata和timeseries metadata的缓存，在内存资源紧张时，可以通过此命令，释放查询时缓存所占的内存空间。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB> CLEAR CACHE |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h3 id="schema-snapshot"><a href="#schema-snapshot" class="header-anchor">#</a> SCHEMA SNAPSHOT</h3> <p>为了加快 IoTDB 重启速度，用户可以手动触发创建 schema 的快照，从而避免服务器从 mlog 文件中恢复。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB> CREATE SNAPSHOT FOR SCHEMA |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h3 id="中止查询"><a href="#中止查询" class="header-anchor">#</a> 中止查询</h3> <p>当使用 IoTDB 时，您可能会遇到以下情形：输入了一个查询，但是由于其包含的数据量过大或是其他原因，导致长时间无法返回结果，但是迫于生产环境无法中止该命令，只能被迫等待。</p> <p>从 0.12 版本开始，IoTDB 对执行时间过长的查询给出了两种解决方案：查询超时和查询中止。</p> <h4 id="查询超时"><a href="#查询超时" class="header-anchor">#</a> 查询超时</h4> <p>对于执行时间过长的查询，IoTDB 将强行中断该查询，并抛出超时异常，如下所示：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB> select * from root; |
| Msg: 701 Current query is time out, please check your statement or modify timeout parameter. |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>系统默认的超时时间为 60000 ms，可以在配置文件中通过 <code>query_timeout_threshold</code> 参数进行自定义配置。</p> <p>如果您使用 JDBC 或 Session，还支持对单个查询设置超时时间（单位为 ms）：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>E.g. ((IoTDBStatement) statement).executeQuery(String sql, long timeoutInMS) |
| E.g. session.executeQueryStatement(String sql, long timeout) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>如果不配置超时时间参数或将超时时间设置为 0，将使用服务器端默认的超时时间.</p> <h4 id="查询中止"><a href="#查询中止" class="header-anchor">#</a> 查询中止</h4> <p>除了被动地等待查询超时外，IoTDB 还支持主动地中止查询，命令为：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>KILL QUERY <queryId> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>通过指定 <code>queryId</code> 可以中止指定的查询，而如果不指定 <code>queryId</code>，将中止所有正在执行的查询。</p> <p>为了获取正在执行的查询 id，用户可以使用 <code>show query processlist</code> 命令，该命令将显示所有正在执行的查询列表，结果形式如下：</p> <table><thead><tr><th>Time</th> <th>queryId</th> <th>statement</th></tr></thead> <tbody><tr><td></td> <td></td> <td></td></tr></tbody></table> <p>其中 statement 最大显示长度为 64 字符。对于超过 64 字符的查询语句，将截取部分进行显示。</p></div> <div class="page-nav"><p class="inner"><span class="prev"> |
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