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| <span><svg 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" class="icon outbound"><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="sr-only">(opens new window)</span></span></a></nav> <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading open"><span>IoTDB User Guide (latest)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>IoTDB Introduction</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Quick Start</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Data Concept</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Syntax Conventions</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>API</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Operate Metadata</span> <span class="arrow right"></span></p> <!----></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</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"><h2 id="performance-tracing-tool"><a href="#performance-tracing-tool" class="header-anchor">#</a> Performance Tracing Tool</h2> <blockquote><p>Note: TRACING ON/OFF hasn't been supported yet.</p></blockquote> <p>IoTDB supports the use of the <code>TRACING</code> clause to enable performance tracing of executed statements. Users can use the performance tracing tool to analyze potential performance problems in some statements.</p> <p>Traceable statement: <code>SELECT</code> only.</p> <p>The current performance analysis includes the following contents:</p> <ol><li>The elapsed time of each stage of the execution process.</li> <li>Statistics related to performance analysis. For query statements, it includes the number of time series queried, the number of Tsfile files accessed, the total number of chunks to be scanned, and the average number of data points contained in the chunk, the total number of pages read, and the number of overlapped pages.</li></ol> <h3 id="example"><a href="#example" class="header-anchor">#</a> Example</h3> <p>For example, execute <code>tracing select * from root</code>, will display the following contents:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>Tracing Activties: |
| +------------------------------------------------------+------------+ |
| | Activity|Elapsed Time| |
| +------------------------------------------------------+------------+ |
| |Start to execute statement: tracing select * from root| 0| |
| | Parse SQL to physical plan| 4| |
| | Create and cache dataset| 16| |
| | * Num of series paths: 3| | |
| | * Num of sequence files read: 2| | |
| | * Num of unsequence files read: 1| | |
| | * Num of sequence chunks: 6, avg points: 100.0| | |
| | * Num of unsequence chunks: 3, avg points: 100.0| | |
| | * Num of Pages: 9, overlapped pages: 0 (0.0%)| | |
| | Request complete| 20| |
| +------------------------------------------------------+------------+ |
| </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></div></div></div> <!----> <p style="text-align: center; color: #909399; font-size: 12px; margin: 0 30px;">Copyright © 2022 The Apache Software Foundation.<br> |
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