| import{_ as e,o as n,c as i,e as t}from"./app-Bx8hKGcu.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}; |