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364.8h-44.8V128c0-17.067-14.933-32-32-32H281.6c-17.067 0-32 14.933-32 32v236.8h-44.8C145.067 364.8 96 413.867 96 473.6v192c0 59.733 49.067 108.8 108.8 108.8h44.8V896c0 17.067 14.933 32 32 32h460.8c17.067 0 32-14.933 32-32V774.4h44.8c59.733 0 108.8-49.067 108.8-108.8v-192c0-59.733-49.067-108.8-108.8-108.8zM313.6 160h396.8v204.8H313.6V160zm396.8 704H313.6V620.8h396.8V864zM864 665.6c0 25.6-19.2 44.8-44.8 44.8h-44.8V588.8c0-17.067-14.933-32-32-32H281.6c-17.067 0-32 14.933-32 32v121.6h-44.8c-25.6 0-44.8-19.2-44.8-44.8v-192c0-25.6 19.2-44.8 44.8-44.8h614.4c25.6 0 44.8 19.2 44.8 44.8v192z"></path></svg></button><div class="arrow end"></div></div><div class="vp-toc-wrapper"><ul class="vp-toc-list"><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#节点管理">节点管理</a></li><li><ul class="vp-toc-list"><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#查看子路径">查看子路径</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#查看子节点">查看子节点</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#统计节点数">统计节点数</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#查看设备">查看设备</a></li><!----><!--]--></ul></li><!--]--></ul><div class="vp-toc-marker" style="top:-1.7rem;"></div></div><!--[--><!----><!--]--></aside></div><!--[--><!----><!--]--><div class="theme-hope-content"><h2 id="节点管理" tabindex="-1"><a class="header-anchor" href="#节点管理"><span>节点管理</span></a></h2><h3 id="查看子路径" tabindex="-1"><a class="header-anchor" href="#查看子路径"><span>查看子路径</span></a></h3><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>SHOW CHILD PATHS pathPattern ? limitClause
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>可以查看此路径模式所匹配的所有路径的下一层的所有路径，即pathPattern.*所匹配的路径。</p><p>查询结果集的大小默认为 10000000，如需查询更多信息，请使用<code>limit</code>和<code>offset</code>。</p><p>示例：</p><ul><li>查询 root.ln 的下一层：show child paths root.ln</li></ul><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>+------------+
| child paths|
+------------+
|root.ln.wf01|
|root.ln.wf02|
+------------+
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>查询形如 root.xx.xx.xx 的路径：show child paths root.*.*</li></ul><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>+---------------+
|    child paths|
+---------------+
|root.ln.wf01.s1|
|root.ln.wf02.s2|
+---------------+
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="查看子节点" tabindex="-1"><a class="header-anchor" href="#查看子节点"><span>查看子节点</span></a></h3><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>SHOW CHILD NODES pathPattern ? limitClause
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>可以查看此路径模式所匹配的节点的下一层的所有节点。</p><p>查询结果集的大小默认为 10000000，如需查询更多信息，请使用<code>limit</code>和<code>offset</code>。</p><p>示例：</p><ul><li>查询 root 的下一层：show child nodes root</li></ul><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>+------------+
| child nodes|
+------------+
|          ln|
+------------+
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>查询 root.ln 的下一层 ：show child nodes root.ln</li></ul><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>+------------+
| child nodes|
+------------+
|        wf01|
|        wf02|
+------------+
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="统计节点数" tabindex="-1"><a class="header-anchor" href="#统计节点数"><span>统计节点数</span></a></h3><p>IoTDB 支持使用<code>COUNT NODES &lt;PathPattern&gt; LEVEL=&lt;INTEGER&gt;</code>来统计当前 Metadata<br> 树下满足某路径模式的路径中指定层级的节点个数。这条语句可以用来统计带有特定采样点的设备数。例如：</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>IoTDB &gt; COUNT NODES root.** LEVEL=2
IoTDB &gt; COUNT NODES root.ln.** LEVEL=2
IoTDB &gt; COUNT NODES root.ln.wf01.* LEVEL=3
IoTDB &gt; COUNT NODES root.**.temperature LEVEL=3
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>对于上面提到的例子和 Metadata Tree，你可以获得如下结果：</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>+-----+
|count|
+-----+
|    4|
+-----+
Total line number = 1
It costs 0.003s

+-----+
|count|
+-----+
|    2|
+-----+
Total line number = 1
It costs 0.002s

+-----+
|count|
+-----+
|    1|
+-----+
Total line number = 1
It costs 0.002s

+-----+
|count|
+-----+
|    2|
+-----+
Total line number = 1
It costs 0.002s
</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 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><blockquote><p>注意：时间序列的路径只是过滤条件，与 level 的定义无关。</p></blockquote><h3 id="查看设备" tabindex="-1"><a class="header-anchor" href="#查看设备"><span>查看设备</span></a></h3><ul><li>SHOW DEVICES pathPattern? (WITH STORAGE GROUP)? limitClause? #showDevices</li></ul><p>查询结果集的大小默认为 10000000，如需查询更多信息，请使用<code>limit</code>和<code>offset</code>。</p><p>与 <code>Show Timeseries</code> 相似，IoTDB 目前也支持两种方式查看设备。</p><ul><li><code>SHOW DEVICES</code> 语句显示当前所有的设备信息，等价于 <code>SHOW DEVICES root.**</code>。</li><li><code>SHOW DEVICES &lt;PathPattern&gt;</code> 语句规定了 <code>PathPattern</code>，返回给定的路径模式所匹配的设备信息。</li></ul><p>SQL 语句如下所示：</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>IoTDB&gt; show devices
IoTDB&gt; show devices root.ln.**
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><p>你可以获得如下数据：</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>+-------------------+---------+
|            devices|isAligned|
+-------------------+---------+
|  root.ln.wf01.wt01|    false|
|  root.ln.wf02.wt02|    false|
|root.sgcc.wf03.wt01|    false|
|    root.turbine.d1|    false|
+-------------------+---------+
Total line number = 4
It costs 0.002s

+-----------------+---------+
|          devices|isAligned|
+-----------------+---------+
|root.ln.wf01.wt01|    false|
|root.ln.wf02.wt02|    false|
+-----------------+---------+
Total line number = 2
It costs 0.001s
</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 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>其中，<code>isAligned</code>表示该设备下的时间序列是否对齐。</p><p>查看设备及其存储组信息，可以使用 <code>SHOW DEVICES WITH STORAGE GROUP</code> 语句。</p><ul><li><code>SHOW DEVICES WITH STORAGE GROUP</code> 语句显示当前所有的设备信息和其所在的存储组，等价于 <code>SHOW DEVICES root.**</code>。</li><li><code>SHOW DEVICES &lt;PathPattern&gt; WITH STORAGE GROUP</code> 语句规定了 <code>PathPattern</code>，返回给定的路径模式所匹配的设备信息和其所在的存储组。</li></ul><p>SQL 语句如下所示：</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>IoTDB&gt; show devices with storage group
IoTDB&gt; show devices root.ln.** with storage group
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><p>你可以获得如下数据：</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>+-------------------+-------------+---------+
|            devices|storage group|isAligned|
+-------------------+-------------+---------+
|  root.ln.wf01.wt01|      root.ln|    false|
|  root.ln.wf02.wt02|      root.ln|    false|
|root.sgcc.wf03.wt01|    root.sgcc|    false|
|    root.turbine.d1| root.turbine|    false|
+-------------------+-------------+---------+
Total line number = 4
It costs 0.003s

+-----------------+-------------+---------+
|          devices|storage group|isAligned|
+-----------------+-------------+---------+
|root.ln.wf01.wt01|      root.ln|    false|
|root.ln.wf02.wt02|      root.ln|    false|
+-----------------+-------------+---------+
Total line number = 2
It costs 0.001s
</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 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><!--[--><!----><!--]--><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/Operate-Metadata/Node.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 prev" href="/zh/UserGuide/V0.13.x/Operate-Metadata/Storage-Group.html" aria-label="存储组操作"><div class="hint"><span class="arrow start"></span>上一页</div><div class="link"><!---->存储组操作</div></a><a class="route-link nav-link next" href="/zh/UserGuide/V0.13.x/Operate-Metadata/Timeseries.html" aria-label="时间序列操作"><div class="hint">下一页<span class="arrow end"></span></div><div class="link">时间序列操作<!----></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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