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href="/zh/UserGuide/V0.13.x/Maintenance-Tools/Export-Schema-Tool.html#使用-sql-方式导出元数据" class="router-link-active router-link-exact-active toc-link level3">使用 SQL 方式导出元数据</a></li><!----><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/zh/UserGuide/V0.13.x/Maintenance-Tools/Export-Schema-Tool.html#使用脚本方式导出元数据" class="router-link-active router-link-exact-active toc-link level3">使用脚本方式导出元数据</a></li><!----><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/zh/UserGuide/V0.13.x/Maintenance-Tools/Export-Schema-Tool.html#常见问题" class="router-link-active router-link-exact-active toc-link level3">常见问题</a></li><!----><!--]--></ul><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/zh/UserGuide/V0.13.x/Maintenance-Tools/Export-Schema-Tool.html#元数据加载操作" class="router-link-active router-link-exact-active toc-link level2">元数据加载操作</a></li><!----><!--]--></ul></div><!--[--><!----><!--]--></aside></div><!----><div class="theme-hope-content"><!--

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--><h2 id="元数据导出操作" tabindex="-1"><a class="header-anchor" href="#元数据导出操作" aria-hidden="true">#</a> 元数据导出操作</h2><p>元数据导出操作会以 mlog.bin 和 tlog.txt 的形式将当前 IoTDB 中的存储组、时间序列、元数据模板信息进行归档，并导出到指定目录中。</p><p>导出的 mlog.bin 和 tlog.txt 文件可以增量的方式加载到已有元数据的 IoTDB 实例中。</p><h3 id="使用-sql-方式导出元数据" tabindex="-1"><a class="header-anchor" href="#使用-sql-方式导出元数据" aria-hidden="true">#</a> 使用 SQL 方式导出元数据</h3><p>元数据导出的 SQL 语句如下所示：</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>EXPORT SCHEMA &#39;&lt;path/dir&gt;&#39; 
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="使用脚本方式导出元数据" tabindex="-1"><a class="header-anchor" href="#使用脚本方式导出元数据" aria-hidden="true">#</a> 使用脚本方式导出元数据</h3><p>Linux/MacOS</p><blockquote><p>./exportSchema.sh -o /yourpath/targetDir -h 127.0.0.1 -p 6667 -u root -pw root</p></blockquote><p>Windows</p><blockquote><p>./exportSchema.bat -o /yourpath/targetDir -h 127.0.0.1 -p 6667 -u root -pw root</p></blockquote><p>使用脚本方式导出元数据时候，需要指定 IoTDB 元数据文件的导出目标目录（位于 IoTDB 服务器），注意导出目标目录必须为绝对路径。</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>usage: ExportSchema -o &lt;target directory path&gt; [-h &lt;host address&gt;] [-p &lt;port&gt;] [-u &lt;user&gt;] [-pw &lt;password&gt;] [-help]
 -o &lt;target directory path&gt;   Need to specify a absolute target directory
                              path on server（required)
 -h &lt;host address&gt;            Could specify a specify the IoTDB host
                              address, default is 127.0.0.1 (optional)
 -p &lt;port&gt;                    Could specify a specify the IoTDB port,
                              default is 6667 (optional)
 -u &lt;user&gt;                    Could specify the IoTDB user name, default
                              is root (optional)
 -pw &lt;password&gt;               Could specify the IoTDB password, default is
                              root (optional)
 -help,--help                 Display help information
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="常见问题" tabindex="-1"><a class="header-anchor" href="#常见问题" aria-hidden="true">#</a> 常见问题</h3><ul><li>找不到或无法加载主类 ExportSchema <ul><li>可能是由于未设置环境变量 $IOTDB_HOME，请设置环境变量之后重试</li></ul></li><li>Encounter an error, because: File ... already exist. <ul><li>目标目录下已有 mlog.bin 或者 tlog.txt 文件，请检查目标目录之后重试</li></ul></li></ul><h2 id="元数据加载操作" tabindex="-1"><a class="header-anchor" href="#元数据加载操作" aria-hidden="true">#</a> 元数据加载操作</h2><p>参考 <a href="https://iotdb.apache.org/zh/UserGuide/V0.13.x/Maintenance-Tools/MLogLoad-Tool.html" target="_blank" rel="noopener noreferrer">MLog 加载工具<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></p></div><!----><footer class="page-meta"><div class="meta-item edit-link"><a href="https://github.com/apache/iotdb/edit/rel/0.13/docs/zh/UserGuide/Maintenance-Tools/Export-Schema-Tool.md" rel="noopener noreferrer" target="_blank" aria-label="发现错误？在 GitHub 上编辑此页" class="nav-link 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="meta-item git-info"><!----><!----></div></footer><nav class="page-nav"><a href="/zh/UserGuide/V0.13.x/Maintenance-Tools/MLogLoad-Tool.html" class="nav-link prev" aria-label="MLog 加载工具"><div class="hint"><span class="arrow start"></span>上一页</div><div class="link"><!---->MLog 加载工具</div></a><a href="/zh/UserGuide/V0.13.x/Maintenance-Tools/NodeTool.html" class="nav-link next" aria-label="节点工具"><div class="hint">下一页<span class="arrow end"></span></div><div class="link">节点工具<!----></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 © 2023 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><p style="text-align:center;margin-top:10px;color:#909399;font-size:12px;margin:0 30px;"> We use <a href="https://analytics.google.com">Google Analytics</a> to collect anonymous, aggregated usage information. </p></footer></div><!--]--><!--]--><!----><!--]--></div>
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