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import{_ as n,c as e,b as a,o as l}from"./app-8RDGKaEm.js";const i={};function t(d,s){return l(),e("div",null,s[0]||(s[0]=[a(`<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-highlighter="prismjs" data-ext="text" data-title="text"><pre><code><span class="line">SHOW CHILD PATHS pathPattern ? limitClause</span>
<span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><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-highlighter="prismjs" data-ext="text" data-title="text"><pre><code><span class="line">+------------+</span>
<span class="line">| child paths|</span>
<span class="line">+------------+</span>
<span class="line">|root.ln.wf01|</span>
<span class="line">|root.ln.wf02|</span>
<span class="line">+------------+</span>
<span class="line"></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><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-highlighter="prismjs" data-ext="text" data-title="text"><pre><code><span class="line">+---------------+</span>
<span class="line">| child paths|</span>
<span class="line">+---------------+</span>
<span class="line">|root.ln.wf01.s1|</span>
<span class="line">|root.ln.wf02.s2|</span>
<span class="line">+---------------+</span>
<span class="line"></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="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-highlighter="prismjs" data-ext="text" data-title="text"><pre><code><span class="line">SHOW CHILD NODES pathPattern ? limitClause</span>
<span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><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-highlighter="prismjs" data-ext="text" data-title="text"><pre><code><span class="line">+------------+</span>
<span class="line">| child nodes|</span>
<span class="line">+------------+</span>
<span class="line">| ln|</span>
<span class="line">+------------+</span>
<span class="line"></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><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-highlighter="prismjs" data-ext="text" data-title="text"><pre><code><span class="line">+------------+</span>
<span class="line">| child nodes|</span>
<span class="line">+------------+</span>
<span class="line">| wf01|</span>
<span class="line">| wf02|</span>
<span class="line">+------------+</span>
<span class="line"></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="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-highlighter="prismjs" data-ext="text" data-title="text"><pre><code><span class="line">IoTDB &gt; COUNT NODES root.** LEVEL=2</span>
<span class="line">IoTDB &gt; COUNT NODES root.ln.** LEVEL=2</span>
<span class="line">IoTDB &gt; COUNT NODES root.ln.wf01.* LEVEL=3</span>
<span class="line">IoTDB &gt; COUNT NODES root.**.temperature LEVEL=3</span>
<span class="line"></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></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-highlighter="prismjs" data-ext="text" data-title="text"><pre><code><span class="line">+-----+</span>
<span class="line">|count|</span>
<span class="line">+-----+</span>
<span class="line">| 4|</span>
<span class="line">+-----+</span>
<span class="line">Total line number = 1</span>
<span class="line">It costs 0.003s</span>
<span class="line"></span>
<span class="line">+-----+</span>
<span class="line">|count|</span>
<span class="line">+-----+</span>
<span class="line">| 2|</span>
<span class="line">+-----+</span>
<span class="line">Total line number = 1</span>
<span class="line">It costs 0.002s</span>
<span class="line"></span>
<span class="line">+-----+</span>
<span class="line">|count|</span>
<span class="line">+-----+</span>
<span class="line">| 1|</span>
<span class="line">+-----+</span>
<span class="line">Total line number = 1</span>
<span class="line">It costs 0.002s</span>
<span class="line"></span>
<span class="line">+-----+</span>
<span class="line">|count|</span>
<span class="line">+-----+</span>
<span class="line">| 2|</span>
<span class="line">+-----+</span>
<span class="line">Total line number = 1</span>
<span class="line">It costs 0.002s</span>
<span class="line"></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></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-highlighter="prismjs" data-ext="text" data-title="text"><pre><code><span class="line">IoTDB&gt; show devices</span>
<span class="line">IoTDB&gt; show devices root.ln.**</span>
<span class="line"></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><p>你可以获得如下数据：</p><div class="language-text line-numbers-mode" data-highlighter="prismjs" data-ext="text" data-title="text"><pre><code><span class="line">+-------------------+---------+</span>
<span class="line">| devices|isAligned|</span>
<span class="line">+-------------------+---------+</span>
<span class="line">| root.ln.wf01.wt01| false|</span>
<span class="line">| root.ln.wf02.wt02| false|</span>
<span class="line">|root.sgcc.wf03.wt01| false|</span>
<span class="line">| root.turbine.d1| false|</span>
<span class="line">+-------------------+---------+</span>
<span class="line">Total line number = 4</span>
<span class="line">It costs 0.002s</span>
<span class="line"></span>
<span class="line">+-----------------+---------+</span>
<span class="line">| devices|isAligned|</span>
<span class="line">+-----------------+---------+</span>
<span class="line">|root.ln.wf01.wt01| false|</span>
<span class="line">|root.ln.wf02.wt02| false|</span>
<span class="line">+-----------------+---------+</span>
<span class="line">Total line number = 2</span>
<span class="line">It costs 0.001s</span>
<span class="line"></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></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-highlighter="prismjs" data-ext="text" data-title="text"><pre><code><span class="line">IoTDB&gt; show devices with storage group</span>
<span class="line">IoTDB&gt; show devices root.ln.** with storage group</span>
<span class="line"></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><p>你可以获得如下数据：</p><div class="language-text line-numbers-mode" data-highlighter="prismjs" data-ext="text" data-title="text"><pre><code><span class="line">+-------------------+-------------+---------+</span>
<span class="line">| devices|storage group|isAligned|</span>
<span class="line">+-------------------+-------------+---------+</span>
<span class="line">| root.ln.wf01.wt01| root.ln| false|</span>
<span class="line">| root.ln.wf02.wt02| root.ln| false|</span>
<span class="line">|root.sgcc.wf03.wt01| root.sgcc| false|</span>
<span class="line">| root.turbine.d1| root.turbine| false|</span>
<span class="line">+-------------------+-------------+---------+</span>
<span class="line">Total line number = 4</span>
<span class="line">It costs 0.003s</span>
<span class="line"></span>
<span class="line">+-----------------+-------------+---------+</span>
<span class="line">| devices|storage group|isAligned|</span>
<span class="line">+-----------------+-------------+---------+</span>
<span class="line">|root.ln.wf01.wt01| root.ln| false|</span>
<span class="line">|root.ln.wf02.wt02| root.ln| false|</span>
<span class="line">+-----------------+-------------+---------+</span>
<span class="line">Total line number = 2</span>
<span class="line">It costs 0.001s</span>
<span class="line"></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></div>`,41)]))}const r=n(i,[["render",t],["__file","Node.html.vue"]]),p=JSON.parse('{"path":"/zh/UserGuide/V0.13.x/Operate-Metadata/Node.html","title":"","lang":"zh-CN","frontmatter":{"description":"节点管理 查看子路径 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。 查询结果集的大小默认为 10000000，如需查询更多信息，请使用limit和offset。 示例： 查询 root.ln 的下一层：show child paths root.ln 查询形如 root.xx.xx.xx 的路径：sh...","head":[["link",{"rel":"alternate","hreflang":"en-us","href":"https://iotdb.apache.org/UserGuide/V0.13.x/Operate-Metadata/Node.html"}],["meta",{"property":"og:url","content":"https://iotdb.apache.org/zh/UserGuide/V0.13.x/Operate-Metadata/Node.html"}],["meta",{"property":"og:site_name","content":"IoTDB Website"}],["meta",{"property":"og:description","content":"节点管理 查看子路径 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。 查询结果集的大小默认为 10000000，如需查询更多信息，请使用limit和offset。 示例： 查询 root.ln 的下一层：show child paths root.ln 查询形如 root.xx.xx.xx 的路径：sh..."}],["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":"2023-07-10T03:11:17.000Z"}],["meta",{"property":"article:modified_time","content":"2023-07-10T03:11:17.000Z"}],["script",{"type":"application/ld+json"},"{\\"@context\\":\\"https://schema.org\\",\\"@type\\":\\"Article\\",\\"headline\\":\\"\\",\\"image\\":[\\"\\"],\\"dateModified\\":\\"2023-07-10T03:11:17.000Z\\",\\"author\\":[]}"]]},"headers":[{"level":2,"title":"节点管理","slug":"节点管理","link":"#节点管理","children":[{"level":3,"title":"查看子路径","slug":"查看子路径","link":"#查看子路径","children":[]},{"level":3,"title":"查看子节点","slug":"查看子节点","link":"#查看子节点","children":[]},{"level":3,"title":"统计节点数","slug":"统计节点数","link":"#统计节点数","children":[]},{"level":3,"title":"查看设备","slug":"查看设备","link":"#查看设备","children":[]}]}],"git":{"createdTime":1688958677000,"updatedTime":1688958677000,"contributors":[{"name":"CritasWang","email":"critas@outlook.com","commits":1}]},"readingTime":{"minutes":2.73,"words":818},"filePathRelative":"zh/UserGuide/V0.13.x/Operate-Metadata/Node.md","localizedDate":"2023年7月10日","autoDesc":true}');export{r as comp,p as data};