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vp-toc-link level3" href="#merge">MERGE</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#clear-cache">CLEAR CACHE</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#set-system-to-readonly-writable">SET SYSTEM TO READONLY / WRITABLE</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#schema-snapshot">SCHEMA SNAPSHOT</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#超时">超时</a></li><!----><!--]--></ul></li><!--]--></ul><div class="vp-toc-marker" style="top:-1.7rem;"></div></div><!--[--><!----><!--]--></aside></div><!--[--><!----><!--]--><div class="theme-hope-content"><h1 id="运维工具" tabindex="-1"><a class="header-anchor" href="#运维工具"><span>运维工具</span></a></h1><h2 id="运维命令" tabindex="-1"><a class="header-anchor" href="#运维命令"><span>运维命令</span></a></h2><h3 id="flush" tabindex="-1"><a class="header-anchor" href="#flush"><span>FLUSH</span></a></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><p>注意：此命令客户端不需要手动调用，IoTDB 有 wal 保证数据安全，IoTDB 会选择合适的时机进行 flush。<br> 如果频繁调用 flush 会导致数据文件很小，降低查询性能。</p><div class="language-sql line-numbers-mode" data-ext="sql" data-title="sql"><pre class="language-sql"><code>IoTDB<span class="token operator">></span> FLUSH |
| IoTDB<span class="token operator">></span> FLUSH root<span class="token punctuation">.</span>ln |
| IoTDB<span class="token operator">></span> FLUSH root<span class="token punctuation">.</span>sg1<span class="token punctuation">,</span>root<span class="token punctuation">.</span>sg2 |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="merge" tabindex="-1"><a class="header-anchor" href="#merge"><span>MERGE</span></a></h3><p>触发层级合并和乱序合并。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> 先触发层级合并，等层级合并执行完后，再触发乱序合并。在乱序合并中，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> 先触发层级合并，等层级合并执行完后，再触发乱序合并。在乱序合并中，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-sql line-numbers-mode" data-ext="sql" data-title="sql"><pre class="language-sql"><code>IoTDB<span class="token operator">></span> <span class="token keyword">MERGE</span> |
| IoTDB<span class="token operator">></span> <span class="token keyword">FULL</span> <span class="token keyword">MERGE</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="clear-cache" tabindex="-1"><a class="header-anchor" href="#clear-cache"><span>CLEAR CACHE</span></a></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-sql line-numbers-mode" data-ext="sql" data-title="sql"><pre class="language-sql"><code>IoTDB<span class="token operator">></span> CLEAR CACHE |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="set-system-to-readonly-writable" tabindex="-1"><a class="header-anchor" href="#set-system-to-readonly-writable"><span>SET SYSTEM TO READONLY / WRITABLE</span></a></h3><p>手动设置系统为只读或者可写入模式。</p><div class="language-sql line-numbers-mode" data-ext="sql" data-title="sql"><pre class="language-sql"><code>IoTDB<span class="token operator">></span> <span class="token keyword">SET</span> SYSTEM <span class="token keyword">TO</span> READONLY |
| IoTDB<span class="token operator">></span> <span class="token keyword">SET</span> SYSTEM <span class="token keyword">TO</span> WRITABLE |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="schema-snapshot" tabindex="-1"><a class="header-anchor" href="#schema-snapshot"><span>SCHEMA SNAPSHOT</span></a></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。此功能不支持使用模板、标签或对齐序列的场景。</p><div class="language-sql line-numbers-mode" data-ext="sql" data-title="sql"><pre class="language-sql"><code>IoTDB<span class="token operator">></span> <span class="token keyword">CREATE</span> <span class="token keyword">SNAPSHOT</span> <span class="token keyword">FOR</span> <span class="token keyword">SCHEMA</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="超时" tabindex="-1"><a class="header-anchor" href="#超时"><span>超时</span></a></h3><p>IoTDB 支持 Session 超时和查询超时。</p><h4 id="session-超时" tabindex="-1"><a class="header-anchor" href="#session-超时"><span>Session 超时</span></a></h4><p>Session 超时控制何时关闭空闲 Session。空闲 Session 指在一段时间内没有发起任何操作的 Session。</p><p>Session 超时默认未开启。可以在配置文件中通过 <code>session_timeout_threshold</code> 参数进行配置。</p><h4 id="查询超时" tabindex="-1"><a class="header-anchor" href="#查询超时"><span>查询超时</span></a></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-sql line-numbers-mode" data-ext="sql" data-title="sql"><pre class="language-sql"><code>IoTDB<span class="token operator">></span> <span class="token keyword">select</span> <span class="token operator">*</span> <span class="token keyword">from</span> root<span class="token punctuation">;</span> |
| Msg: <span class="token number">701</span> <span class="token keyword">Current</span> query <span class="token operator">is</span> <span class="token keyword">time</span> <span class="token keyword">out</span><span class="token punctuation">,</span> please <span class="token keyword">check</span> your statement <span class="token operator">or</span> <span class="token keyword">modify</span> timeout parameter<span class="token punctuation">.</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><p>系统默认的超时时间为 60000 ms，可以在配置文件中通过 <code>query_timeout_threshold</code> 参数进行自定义配置。</p><p>如果您使用 JDBC 或 Session，还支持对单个查询设置超时时间（单位为 ms）：</p><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token class-name">IoTDBStatement</span><span class="token punctuation">)</span> statement<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">executeQuery</span><span class="token punctuation">(</span><span class="token class-name">String</span> sql<span class="token punctuation">,</span> <span class="token keyword">long</span> timeoutInMS<span class="token punctuation">)</span> |
| session<span class="token punctuation">.</span><span class="token function">executeQueryStatement</span><span class="token punctuation">(</span><span class="token class-name">String</span> sql<span class="token punctuation">,</span> <span class="token keyword">long</span> timeout<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><blockquote><p>如果不配置超时时间参数或将超时时间设置为负数，将使用服务器端默认的超时时间。<br> 如果超时时间设置为0，则会禁用超时功能。</p></blockquote><h4 id="查询中止" tabindex="-1"><a class="header-anchor" href="#查询中止"><span>查询中止</span></a></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-sql line-numbers-mode" data-ext="sql" data-title="sql"><pre class="language-sql"><code><span class="token keyword">KILL</span> QUERY <span class="token operator"><</span>queryId<span class="token operator">></span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>通过指定 <code>queryId</code> 可以中止指定的查询，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><!--[--><!----><!--]--><footer class="vp-page-meta"><div class="vp-meta-item edit-link"><a href="https://github.com/apache/iotdb-docs/edit/main/src/zh/UserGuide/V0.13.x/Maintenance-Tools/Maintenance-Command.md" rel="noopener noreferrer" target="_blank" aria-label="发现错误？在 GitHub 上编辑此页" class="nav-link vp-meta-label"><!--[--><svg xmlns="http://www.w3.org/2000/svg" class="icon edit-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="edit icon"><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<span><svg class="external-link-icon" 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"><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="external-link-icon-sr-only">open in new window</span></span><!----></a></div><div class="vp-meta-item git-info"><div class="update-time"><span class="vp-meta-label">上次编辑于: </span><!----></div><!----></div></footer><nav class="vp-page-nav"><!----><a class="route-link nav-link next" href="/zh/UserGuide/V0.13.x/Maintenance-Tools/Log-Tool.html" aria-label="日志工具"><div class="hint">下一页<span class="arrow end"></span></div><div class="link">日志工具<!----></div></a></nav><!----><!--[--><!----><!--]--><!--]--></main><!--]--><footer style="padding-bottom:2rem;"><span id="doc-version" style="display:none;">rel/0.13</span><p style="text-align:center;color:#909399;font-size:12px;margin:0 30px;">Copyright © 2024 The Apache Software Foundation.<br> Apache and the Apache feather logo are trademarks of The Apache Software Foundation</p><p style="text-align:center;margin-top:10px;color:#909399;font-size:12px;margin:0 30px;"><strong>Have a question?</strong> Connect with us on QQ, WeChat, or Slack. <a href="https://github.com/apache/iotdb/issues/1995">Join the community</a> now.</p></footer></div><!--]--><!--]--><!--[--><!----><!--]--><!--]--></div> |
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