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ON/OFF</code> 。</p></blockquote><p>IoTDB 支持使用 <code>TRACING</code> 关键词对查询语句进行性能追踪。用户可以分析查询语句执行中存在的潜在性能问题。</p><p>性能追踪的结果包括：</p><ol><li>执行过程中各个阶段的累积耗时。</li><li>与性能分析相关的统计信息。对于查询语句，包括查询的时间序列数、涉及访问的 Tsfile 文件数、需要扫描的 chunk 总数以及平均每个 chunk 包含的数据点个数、读取的 Page 总数以及其中乱序 Page 的个数。</li></ol><p><strong>示例：</strong></p><p>例如执行 <code>tracing select * from root</code>，输出结果如下：</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><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|
+------------------------------------------------------+------------+
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