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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"><span>IoTDB用户手册 (In progress)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>开始</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>概述</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>概念</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>服务器端</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>客户端</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>操作指南</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>系统工具</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/zh/UserGuide/Master/System Tools/Sync Tool.html" class="sidebar-link">同步工具</a></li><li><a href="/zh/UserGuide/Master/System Tools/JMX Tool.html" class="sidebar-link">JMX工具</a></li><li><a href="/zh/UserGuide/Master/System Tools/Watermark Tool.html" class="sidebar-link">水印工具</a></li><li><a href="/zh/UserGuide/Master/System Tools/Query History Visualization Tool.html" class="sidebar-link">查询历史可视化工具</a></li><li><a href="/zh/UserGuide/Master/System Tools/Monitor and Log Tools.html" class="sidebar-link">监控与日志工具</a></li><li><a href="/zh/UserGuide/Master/System Tools/Load External Tsfile.html" class="sidebar-link">加载外部tsfile文件</a></li><li><a href="/zh/UserGuide/Master/System Tools/Performance Tracing Tool.html" class="active sidebar-link">性能追踪工具</a></li><li><a href="/zh/UserGuide/Master/System Tools/MLogParser Tool.html" class="sidebar-link">MLog解析工具</a></li><li><a href="/zh/UserGuide/Master/System Tools/NodeTool.html" class="sidebar-link">集群状态工具</a></li><li><a href="/zh/UserGuide/Master/System Tools/CSV Tool.html" class="sidebar-link">CSV工具</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>生态集成</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>系统设计</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="性能追踪工具"><a href="#性能追踪工具" class="header-anchor">#</a> 性能追踪工具</h1> <p>IoTDB 支持使用 <code>TRACING</code> 语句来启用/禁用对查询语句的性能追踪，默认处于禁用状态。用户可以使用性能追踪工具来分析某些查询中存在的潜在性能问题。性能分析的日志文件默认存储在 <code>./data/tracing</code> 目录下。</p> <p>启用 Tracing：</p> <p><code>IoTDB> TRACING ON</code></p> <p>禁用 Tracing：</p> <p><code>IoTDB> TRACING OFF</code></p> <p>由于一个 IoTDB 查询时间主要取决于查询的时间序列数、涉及访问的 Tsfile 文件数、需要扫描的 chunk 总数以及平均每个 chunk 的大小（指该 chunk 中包含的数据点的个数）。因此，目前性能分析包括的内容如下：</p> <ul><li>Start time</li> <li>Query statement</li> <li>Number of series paths</li> <li>Number of sequence files</li> <li>Statistics of each sequence file</li> <li>Number of unSequence files</li> <li>Statistics of each unSequence file</li> <li>Number of chunks</li> <li>Average size of chunks</li> <li>Total cost time</li></ul> <h2 id="example"><a href="#example" class="header-anchor">#</a> Example</h2> <p>例如执行 <code>select * from root</code>，则 tracing 日志文件的内容会包括以下内容：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>Query Id: 2 - Start time: 2020-06-28 10:53:54.727 |
| Query Id: 2 - Query Statement: select * from root |
| Query Id: 2 - Number of series paths: 3 |
| Query Id: 2 - Number of sequence files: 1 |
| Query Id: 2 - SeqFile_1603336100446-1-0.tsfile root.sg.d1[1, 10000] |
| Query Id: 2 - Number of unsequence files: 1 |
| Query Id: 2 - UnSeqFile_1603354798303-2-0.tsfile root.sg.d1[9, 1000] |
| Query Id: 2 - Number of chunks: 3 |
| Query Id: 2 - Average size of chunks: 4113 |
| Query Id: 2 - Total cost time: 11ms |
| </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></div></div><p>为了避免多个查询同时执行导致输出信息乱序，在每条输出信息前均增加了该次查询的 Query Id，用户可以使用 <code>grep "Query Id: 2" tracing.txt</code> 来提取某次查询的所有追踪信息。</p></div> <div class="page-nav"><p class="inner"><span class="prev"> |
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