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| Since version 0.12, IoTDB has provided two solutions for queries with long execution time: query timeout and query abort.</p> <h2 id="query-timeout"><a href="#query-timeout" class="header-anchor">#</a> Query timeout</h2> <p>For queries that take too long to execute, IoTDB will forcibly interrupt the query and throw a timeout exception, as shown in the figure:</p> <p><img src="https://user-images.githubusercontent.com/34242296/104586593-a224aa00-56a0-11eb-9c52-241dcdb68ecb.png" alt="image"></p> <p>The default timeout of the system is 60000 ms，which can be customized in the configuration file through the <code>query_timeout_threshold</code> parameter.</p> <p>If you use JDBC or Session, we also support setting a timeout for a single query（Unit: ms）：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>E.g. ((IoTDBStatement) statement).executeQuery(String sql, long timeoutInMS) |
| E.g. session.executeQueryStatement(String sql, long timeout) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>If the timeout parameter is not configured or with value 0, the default timeout time will be used.</p> <h2 id="query-abort"><a href="#query-abort" class="header-anchor">#</a> Query abort</h2> <p>In addition to waiting for the query to time out passively, IoTDB also supports stopping the query actively:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>KILL QUERY <queryId> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>You can abort the specified query by specifying <code>queryId</code>. If <code>queryId</code> is not specified, all executing queries will be killed.</p> <p>To get the executing <code>queryId</code>，you can use the <code>show query processlist</code> command，which will show the list of all executing queries，with the following result set：</p> <table><thead><tr><th>Time</th> <th>queryId</th> <th>statement</th></tr></thead> <tbody><tr><td></td> <td></td> <td></td></tr></tbody></table> <p>The maximum display length of statement is 64 characters. For statements with more than 64 characters, the intercepted part will be displayed.</p></div> <div class="page-nav"><p class="inner"><span class="prev"> |
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