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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 User Guide (In progress)</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 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right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Collaboration of Edge and Cloud</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>FAQ</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Appendix</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Comparison with TSDBs</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="maintenance-command"><a href="#maintenance-command" class="header-anchor">#</a> Maintenance Command</h1> <h2 id="flush"><a href="#flush" class="header-anchor">#</a> FLUSH</h2> <p>Persist all the data points in the memory table of the storage group to the disk, and seal the data file.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB> FLUSH |
| IoTDB> FLUSH root.ln |
| IoTDB> FLUSH root.sg1,root.sg2 |
| </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></div></div><h2 id="merge"><a href="#merge" class="header-anchor">#</a> MERGE</h2> <p>Execute Level Compaction and unsequence Compaction task. Currently IoTDB supports the following two types of SQL to manually trigger the compaction process of data files:</p> <ul><li><code>MERGE</code> Execute the level compaction first and then execute the unsequence compaction. In unsequence compaction process, this command is executed very fast by rewriting the overlapped Chunks only, while there is some redundant data on the disk eventually.</li> <li><code>FULL MERGE</code> Execute the level compaction first and then execute the unsequence compaction. In unsequence compaction process, this command is executed slow due to it takes more time to rewrite all data in overlapped files. However, there won't be any redundant data on the disk eventually.</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB> MERGE |
| IoTDB> FULL MERGE |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><h2 id="clear-cache"><a href="#clear-cache" class="header-anchor">#</a> CLEAR CACHE</h2> <p>Clear the cache of chunk, chunk metadata and timeseries metadata to release the memory footprint.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB> CLEAR CACHE |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h2 id="schema-snapshot"><a href="#schema-snapshot" class="header-anchor">#</a> SCHEMA SNAPSHOT</h2> <p>To speed up restarting of IoTDB, users can create snapshot of schema and avoid recovering schema from mlog file.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB> CREATE SNAPSHOT FOR SCHEMA |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h2 id="timeout"><a href="#timeout" class="header-anchor">#</a> Timeout</h2> <p>IoTDB supports session and query level timeout.</p> <h3 id="session-timeout"><a href="#session-timeout" class="header-anchor">#</a> Session timeout</h3> <p>Session timeout controls when idle sessions are closed. An idle session is one that had not initiated any query or non-query operations for a period of time.</p> <p>Session timeout is disabled by default and can be set using the <code>session_timeout_threshold</code> parameter in IoTDB configuration file.</p> <h3 id="query-timeout"><a href="#query-timeout" class="header-anchor">#</a> Query timeout</h3> <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> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB> select * from root; |
| Msg: 701 Current query is time out, please check your statement or modify timeout parameter. |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>The default timeout of a query 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> <h3 id="query-abort"><a href="#query-abort" class="header-anchor">#</a> Query abort</h3> <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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