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href="/UserGuide/V0.13.x/Operate-Metadata/TTL.html#show-ttl" class="sidebar-link">Show TTL</a></li></ul></li><li><a href="/UserGuide/V0.13.x/Operate-Metadata/Auto-Create-MetaData.html" class="sidebar-link">Auto Create Metadata</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/UserGuide/V0.13.x/Operate-Metadata/Auto-Create-MetaData.html#auto-create-storage-group-metadata" class="sidebar-link">Auto create storage group metadata</a></li><li class="sidebar-sub-header"><a href="/UserGuide/V0.13.x/Operate-Metadata/Auto-Create-MetaData.html#auto-create-time-series-metadata-specify-data-type-in-the-frontend" class="sidebar-link">Auto create time series metadata(specify data type in the frontend)</a></li><li class="sidebar-sub-header"><a href="/UserGuide/V0.13.x/Operate-Metadata/Auto-Create-MetaData.html#auto-create-time-series-metadata-infer-data-type-in-the-backend" class="sidebar-link">Auto create time series metadata(infer data type in the backend)</a></li></ul></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Write and Delete Data</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Query Data</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Process Data</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Administration Management</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Maintenance Tools</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Ecosystem Integration</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Cluster Setup</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>UDF Library</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Reference</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="node-management"><a href="#node-management" class="header-anchor">#</a> Node Management</h1> <h2 id="show-child-paths"><a href="#show-child-paths" class="header-anchor">#</a> Show Child Paths</h2> <div class="language- line-numbers-mode"><pre class="language-text"><code>SHOW CHILD PATHS pathPattern ? limitClause |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Return all child paths of all the paths matching pathPattern.</p> <p>The default size of result set is 1000. To query more child paths, please use <code>limit</code> and <code>offset</code>.</p> <p>Example：</p> <ul><li>return the child paths of root.ln：show child paths root.ln</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>+------------+ |
| | child paths| |
| +------------+ |
| |root.ln.wf01| |
| |root.ln.wf02| |
| +------------+ |
| Total line number = 2 |
| It costs 0.002s |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br></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"><a href="#show-child-nodes" class="header-anchor">#</a> Show Child Nodes</h2> <div class="language- line-numbers-mode"><pre class="language-text"><code>SHOW CHILD NODES pathPattern ? limitClause |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Return all child nodes of the pathPattern.</p> <p>The default size of result set is 1000. To query more child paths, please use <code>limit</code> and <code>offset</code>.</p> <p>Example：</p> <ul><li>return the child nodes of root：show child nodes root</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>+------------+ |
| | child nodes| |
| +------------+ |
| | ln| |
| +------------+ |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><ul><li>return the child nodes of root.ln：show child nodes root.ln</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>+------------+ |
| | child nodes| |
| +------------+ |
| | wf01| |
| | wf02| |
| +------------+ |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><h2 id="count-nodes"><a href="#count-nodes" class="header-anchor">#</a> Count Nodes</h2> <p>IoTDB is able to use <code>COUNT NODES <PathPattern> LEVEL=<INTEGER></code> to count the number of nodes at |
| the given level in current Metadata Tree considering a given pattern. IoTDB will find paths that |
| match the pattern and counts distinct nodes at the specified level among the matched paths. |
| This could be used to query the number of devices with specified measurements. The usage are as |
| follows:</p> <div class="language- line-numbers-mode"><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-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><p>As for the above mentioned example and Metadata tree, you can get following results:</p> <div class="language- line-numbers-mode"><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-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br></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"><a href="#show-devices" class="header-anchor">#</a> Show Devices</h2> <ul><li>SHOW DEVICES pathPattern? (WITH STORAGE GROUP)? limitClause? #showDevices</li></ul> <p>The default size of result set is 1000. To query more child paths, please use <code>limit</code> and <code>offset</code>.</p> <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- line-numbers-mode"><pre class="language-text"><code>IoTDB> show devices |
| IoTDB> show devices root.ln.** |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>You can get results below:</p> <div class="language- line-numbers-mode"><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-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br></div></div><p><code>isAligned</code> indicates whether the timeseries under the device are aligned.</p> <p>To view devices' information with storage group, we can use <code>SHOW DEVICES WITH STORAGE GROUP</code> statement.</p> <ul><li><code>SHOW DEVICES WITH STORAGE GROUP</code> statement presents all devices' information with their storage group.</li> <li><code>SHOW DEVICES <PathPattern> WITH STORAGE GROUP</code> statement specifies the <code>PathPattern</code> and returns the |
| devices' information under the given level with their storage group information.</li></ul> <p>SQL statement is as follows:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB> show devices with storage group |
| IoTDB> show devices root.ln.** with storage group |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>You can get results below:</p> <div class="language- line-numbers-mode"><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-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br></div></div></div> <div class="page-nav"><p class="inner"><span class="prev"> |
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