assets/Node.html-C1RA_XQu.js - iotdb-website - Git at Google

 import{_ as e,o as n,c as i,e as t}from"./app-Bp5kEZWW.js";const s={},l=t(`<h1 id="node-management" tabindex="-1"><a class="header-anchor" href="#node-management"><span>Node Management</span></a></h1><h2 id="show-child-paths" tabindex="-1"><a class="header-anchor" href="#show-child-paths"><span>Show Child Paths</span></a></h2><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>SHOW CHILD PATHS pathPattern
 </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>Return all child paths and their node types of all the paths matching pathPattern.</p><p>node types: ROOT -&gt; DB INTERNAL -&gt; DATABASE -&gt; INTERNAL -&gt; DEVICE -&gt; TIMESERIES</p><p>Example：</p><ul><li>return the child paths of root.ln：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|node types|
 +------------+----------+
 |root.ln.wf01|  INTERNAL|
 |root.ln.wf02|  INTERNAL|
 +------------+----------+
 Total line number = 2
 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></div><blockquote><p>get all paths in form of root.xx.xx.xx：show child paths root.xx.xx</p></blockquote><h2 id="show-child-nodes" tabindex="-1"><a class="header-anchor" href="#show-child-nodes"><span>Show Child Nodes</span></a></h2><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>SHOW CHILD NODES pathPattern
 </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>Return all child nodes of the pathPattern.</p><p>Example：</p><ul><li>return the child nodes of root：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>return the child nodes of root.ln：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><h2 id="count-nodes" tabindex="-1"><a class="header-anchor" href="#count-nodes"><span>Count Nodes</span></a></h2><p>IoTDB is able to use <code>COUNT NODES &lt;PathPattern&gt; LEVEL=&lt;INTEGER&gt;</code> to count the number of nodes at<br> the given level in current Metadata Tree considering a given pattern. IoTDB will find paths that<br> match the pattern and counts distinct nodes at the specified level among the matched paths.<br> This could be used to query the number of devices with specified measurements. The usage are as<br> follows:</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>As for the above mentioned example and Metadata tree, you can get following results:</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>+------------+
 |count(nodes)|
 +------------+
 |           4|
 +------------+
 Total line number = 1
 It costs 0.003s

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

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

 +------------+
 |count(nodes)|
 +------------+
 |           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>Note: The path of timeseries is just a filter condition, which has no relationship with the definition of level.</p></blockquote><h2 id="show-devices" tabindex="-1"><a class="header-anchor" href="#show-devices"><span>Show Devices</span></a></h2><ul><li>SHOW DEVICES pathPattern? (WITH DATABASE)? limitClause? #showDevices</li></ul><p>Similar to <code>Show Timeseries</code>, IoTDB also supports two ways of viewing devices:</p><ul><li><code>SHOW DEVICES</code> statement presents all devices&#39; information, which is equal to <code>SHOW DEVICES root.**</code>.</li><li><code>SHOW DEVICES &lt;PathPattern&gt;</code> statement specifies the <code>PathPattern</code> and returns the devices information matching the pathPattern and under the given level.</li></ul><p>SQL statement is as follows:</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>You can get results below:</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><code>isAligned</code> indicates whether the timeseries under the device are aligned.</p><p>To view devices&#39; information with database, we can use <code>SHOW DEVICES WITH DATABASE</code> statement.</p><ul><li><code>SHOW DEVICES WITH DATABASE</code> statement presents all devices&#39; information with their database.</li><li><code>SHOW DEVICES &lt;PathPattern&gt; WITH DATABASE</code> statement specifies the <code>PathPattern</code> and returns the<br> devices&#39; information under the given level with their database information.</li></ul><p>SQL statement is as follows:</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>IoTDB&gt; show devices with database
 IoTDB&gt; show devices root.ln.** with database
 </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><p>You can get results below:</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>+-------------------+-------------+---------+
 |            devices|     database|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|     database|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><h2 id="count-devices" tabindex="-1"><a class="header-anchor" href="#count-devices"><span>Count Devices</span></a></h2><ul><li>COUNT DEVICES &lt;PathPattern&gt;</li></ul><p>The above statement is used to count the number of devices. At the same time, it is allowed to specify <code>PathPattern</code> to count the number of devices matching the <code>PathPattern</code>.</p><p>SQL statement is as follows:</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; count devices
 IoTDB&gt; count devices root.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></div><p>You can get results below:</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>+-------------------+---------+
 |            devices|isAligned|
 +-------------------+---------+
 |root.sgcc.wf03.wt03|    false|
 |    root.turbine.d1|    false|
 |  root.ln.wf02.wt02|    false|
 |  root.ln.wf01.wt01|    false|
 +-------------------+---------+
 Total line number = 4
 It costs 0.024s

 +--------------+
 |count(devices)|
 +--------------+
 |             4|
 +--------------+
 Total line number = 1
 It costs 0.004s

 +--------------+
 |count(devices)|
 +--------------+
 |             2|
 +--------------+
 Total line number = 1
 It costs 0.004s
 </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></div>`,45),d=[l];function a(o,r){return n(),i("div",null,d)}const v=e(s,[["render",a],["__file","Node.html.vue"]]),u=JSON.parse('{"path":"/UserGuide/V1.0.x/Operate-Metadata/Node.html","title":"Node Management","lang":"en-US","frontmatter":{"description":"Node Management Show Child Paths Return all child paths and their node types of all the paths matching pathPattern. node types: ROOT -> DB INTERNAL -> DATABASE -> INTERNAL -> DE...","head":[["link",{"rel":"alternate","hreflang":"zh-cn","href":"https://iotdb.apache.org/zh/UserGuide/V1.0.x/Operate-Metadata/Node.html"}],["meta",{"property":"og:url","content":"https://iotdb.apache.org/UserGuide/V1.0.x/Operate-Metadata/Node.html"}],["meta",{"property":"og:site_name","content":"IoTDB Website"}],["meta",{"property":"og:title","content":"Node Management"}],["meta",{"property":"og:description","content":"Node Management Show Child Paths Return all child paths and their node types of all the paths matching pathPattern. node types: ROOT -> DB INTERNAL -> DATABASE -> INTERNAL -> DE..."}],["meta",{"property":"og:type","content":"article"}],["meta",{"property":"og:locale","content":"en-US"}],["meta",{"property":"og:locale:alternate","content":"zh-CN"}],["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\\":\\"Node Management\\",\\"image\\":[\\"\\"],\\"dateModified\\":\\"2023-07-10T03:11:17.000Z\\",\\"author\\":[]}"]]},"headers":[{"level":2,"title":"Show Child Paths","slug":"show-child-paths","link":"#show-child-paths","children":[]},{"level":2,"title":"Show Child Nodes","slug":"show-child-nodes","link":"#show-child-nodes","children":[]},{"level":2,"title":"Count Nodes","slug":"count-nodes","link":"#count-nodes","children":[]},{"level":2,"title":"Show Devices","slug":"show-devices","link":"#show-devices","children":[]},{"level":2,"title":"Count Devices","slug":"count-devices","link":"#count-devices","children":[]}],"git":{"createdTime":1688958677000,"updatedTime":1688958677000,"contributors":[{"name":"CritasWang","email":"critas@outlook.com","commits":1}]},"readingTime":{"minutes":2.35,"words":704},"filePathRelative":"UserGuide/V1.0.x/Operate-Metadata/Node.md","localizedDate":"July 10, 2023","autoDesc":true}');export{v as comp,u as data};
	import{_ as e,o as n,c as i,e as t}from"./app-Bp5kEZWW.js";const s={},l=t(`<h1 id="node-management" tabindex="-1"><a class="header-anchor" href="#node-management"><span>Node Management</span></a></h1><h2 id="show-child-paths" tabindex="-1"><a class="header-anchor" href="#show-child-paths"><span>Show Child Paths</span></a></h2><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>SHOW CHILD PATHS pathPattern
	</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>Return all child paths and their node types of all the paths matching pathPattern.</p><p>node types: ROOT -> DB INTERNAL -> DATABASE -> INTERNAL -> DEVICE -> TIMESERIES</p><p>Example：</p><ul><li>return the child paths of root.ln：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\|node types\|
	+------------+----------+
	\|root.ln.wf01\| INTERNAL\|
	\|root.ln.wf02\| INTERNAL\|
	+------------+----------+
	Total line number = 2
	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></div><blockquote><p>get all paths in form of root.xx.xx.xx：show child paths root.xx.xx</p></blockquote><h2 id="show-child-nodes" tabindex="-1"><a class="header-anchor" href="#show-child-nodes"><span>Show Child Nodes</span></a></h2><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>SHOW CHILD NODES pathPattern
	</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>Return all child nodes of the pathPattern.</p><p>Example：</p><ul><li>return the child nodes of root：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>return the child nodes of root.ln：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><h2 id="count-nodes" tabindex="-1"><a class="header-anchor" href="#count-nodes"><span>Count Nodes</span></a></h2><p>IoTDB is able to use <code>COUNT NODES <PathPattern> LEVEL=<INTEGER></code> to count the number of nodes at<br> the given level in current Metadata Tree considering a given pattern. IoTDB will find paths that<br> match the pattern and counts distinct nodes at the specified level among the matched paths.<br> This could be used to query the number of devices with specified measurements. The usage are as<br> follows:</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>IoTDB > COUNT NODES root.** LEVEL=2
	IoTDB > COUNT NODES root.ln.** LEVEL=2
	IoTDB > COUNT NODES root.ln.wf01.** LEVEL=3
	IoTDB > 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>As for the above mentioned example and Metadata tree, you can get following results:</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>+------------+
	\|count(nodes)\|
	+------------+
	\| 4\|
	+------------+
	Total line number = 1
	It costs 0.003s

	+------------+
	\|count(nodes)\|
	+------------+
	\| 2\|
	+------------+
	Total line number = 1
	It costs 0.002s

	+------------+
	\|count(nodes)\|
	+------------+
	\| 1\|
	+------------+
	Total line number = 1
	It costs 0.002s

	+------------+
	\|count(nodes)\|
	+------------+
	\| 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>Note: The path of timeseries is just a filter condition, which has no relationship with the definition of level.</p></blockquote><h2 id="show-devices" tabindex="-1"><a class="header-anchor" href="#show-devices"><span>Show Devices</span></a></h2><ul><li>SHOW DEVICES pathPattern? (WITH DATABASE)? limitClause? #showDevices</li></ul><p>Similar to <code>Show Timeseries</code>, IoTDB also supports two ways of viewing devices:</p><ul><li><code>SHOW DEVICES</code> statement presents all devices' information, which is equal to <code>SHOW DEVICES root.**</code>.</li><li><code>SHOW DEVICES <PathPattern></code> statement specifies the <code>PathPattern</code> and returns the devices information matching the pathPattern and under the given level.</li></ul><p>SQL statement is as follows:</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>IoTDB> show devices
	IoTDB> 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>You can get results below:</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><code>isAligned</code> indicates whether the timeseries under the device are aligned.</p><p>To view devices' information with database, we can use <code>SHOW DEVICES WITH DATABASE</code> statement.</p><ul><li><code>SHOW DEVICES WITH DATABASE</code> statement presents all devices' information with their database.</li><li><code>SHOW DEVICES <PathPattern> WITH DATABASE</code> statement specifies the <code>PathPattern</code> and returns the<br> devices' information under the given level with their database information.</li></ul><p>SQL statement is as follows:</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>IoTDB> show devices with database
	IoTDB> show devices root.ln.** with database
	</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><p>You can get results below:</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>+-------------------+-------------+---------+
	\| devices\| database\|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\| database\|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><h2 id="count-devices" tabindex="-1"><a class="header-anchor" href="#count-devices"><span>Count Devices</span></a></h2><ul><li>COUNT DEVICES <PathPattern></li></ul><p>The above statement is used to count the number of devices. At the same time, it is allowed to specify <code>PathPattern</code> to count the number of devices matching the <code>PathPattern</code>.</p><p>SQL statement is as follows:</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>IoTDB> show devices
	IoTDB> count devices
	IoTDB> count devices root.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></div><p>You can get results below:</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>+-------------------+---------+
	\| devices\|isAligned\|
	+-------------------+---------+
	\|root.sgcc.wf03.wt03\| false\|
	\| root.turbine.d1\| false\|
	\| root.ln.wf02.wt02\| false\|
	\| root.ln.wf01.wt01\| false\|
	+-------------------+---------+
	Total line number = 4
	It costs 0.024s

	+--------------+
	\|count(devices)\|
	+--------------+
	\| 4\|
	+--------------+
	Total line number = 1
	It costs 0.004s

	+--------------+
	\|count(devices)\|
	+--------------+
	\| 2\|
	+--------------+
	Total line number = 1
	It costs 0.004s
	</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></div>`,45),d=[l];function a(o,r){return n(),i("div",null,d)}const v=e(s,[["render",a],["__file","Node.html.vue"]]),u=JSON.parse('{"path":"/UserGuide/V1.0.x/Operate-Metadata/Node.html","title":"Node Management","lang":"en-US","frontmatter":{"description":"Node Management Show Child Paths Return all child paths and their node types of all the paths matching pathPattern. node types: ROOT -> DB INTERNAL -> DATABASE -> INTERNAL -> DE...","head":[["link",{"rel":"alternate","hreflang":"zh-cn","href":"https://iotdb.apache.org/zh/UserGuide/V1.0.x/Operate-Metadata/Node.html"}],["meta",{"property":"og:url","content":"https://iotdb.apache.org/UserGuide/V1.0.x/Operate-Metadata/Node.html"}],["meta",{"property":"og:site_name","content":"IoTDB Website"}],["meta",{"property":"og:title","content":"Node Management"}],["meta",{"property":"og:description","content":"Node Management Show Child Paths Return all child paths and their node types of all the paths matching pathPattern. node types: ROOT -> DB INTERNAL -> DATABASE -> INTERNAL -> DE..."}],["meta",{"property":"og:type","content":"article"}],["meta",{"property":"og:locale","content":"en-US"}],["meta",{"property":"og:locale:alternate","content":"zh-CN"}],["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\\":\\"Node Management\\",\\"image\\":[\\"\\"],\\"dateModified\\":\\"2023-07-10T03:11:17.000Z\\",\\"author\\":[]}"]]},"headers":[{"level":2,"title":"Show Child Paths","slug":"show-child-paths","link":"#show-child-paths","children":[]},{"level":2,"title":"Show Child Nodes","slug":"show-child-nodes","link":"#show-child-nodes","children":[]},{"level":2,"title":"Count Nodes","slug":"count-nodes","link":"#count-nodes","children":[]},{"level":2,"title":"Show Devices","slug":"show-devices","link":"#show-devices","children":[]},{"level":2,"title":"Count Devices","slug":"count-devices","link":"#count-devices","children":[]}],"git":{"createdTime":1688958677000,"updatedTime":1688958677000,"contributors":[{"name":"CritasWang","email":"critas@outlook.com","commits":1}]},"readingTime":{"minutes":2.35,"words":704},"filePathRelative":"UserGuide/V1.0.x/Operate-Metadata/Node.md","localizedDate":"July 10, 2023","autoDesc":true}');export{v as comp,u as data};