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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 (V0.11.x)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>Get Started</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/UserGuide/V0.11.x/Get Started/QuickStart.html" class="sidebar-link">QuickStart</a></li><li><a href="/UserGuide/V0.11.x/Get Started/Frequently asked questions.html" class="active sidebar-link">Frequently asked questions</a></li><li><a href="/UserGuide/V0.11.x/Get Started/Publication.html" class="sidebar-link">Research Papers</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Overview</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Concept</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Server</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Client</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Operation Manual</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>System 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>Architecture</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="frequently-asked-questions"><a href="#frequently-asked-questions" class="header-anchor">#</a> Frequently Asked Questions</h1> <h2 id="outline"><a href="#outline" class="header-anchor">#</a> Outline</h2> <ul><li>Frequently Asked Questions |
| <ul><li>How can I identify my version of IoTDB?</li> <li>Where can I find IoTDB logs?</li> <li>Where can I find IoTDB data files?</li> <li>How do I know how many time series are stored in IoTDB?</li> <li>Can I use Hadoop and Spark to read TsFile in IoTDB?</li> <li>How does IoTDB handle duplicate points?</li> <li>How can I tell what type of the specific timeseries?</li> <li>How can I change IoTDB's Cli time display format?</li></ul></li></ul> <h2 id="how-can-i-identify-my-version-of-iotdb"><a href="#how-can-i-identify-my-version-of-iotdb" class="header-anchor">#</a> How can I identify my version of IoTDB?</h2> <p>There are several ways to identify the version of IoTDB that you are using:</p> <ul><li>Launch IoTDB's Command Line Interface:</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>> ./start-cli.sh -p 6667 -pw root -u root -h localhost |
| _____ _________ ______ ______ |
| |_ _| | _ _ ||_ _ `.|_ _ \ |
| | | .--.|_/ | | \_| | | `. \ | |_) | |
| | | / .'`\ \ | | | | | | | __'. |
| _| |_| \__. | _| |_ _| |_.' /_| |__) | |
| |_____|'.__.' |_____| |______.'|_______/ version x.x.x |
| </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></div></div><ul><li>Check pom.xml file:</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code><version>x.x.x</version> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><ul><li>Use JDBC API:</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>String iotdbVersion = tsfileDatabaseMetadata.getDatabaseProductVersion(); |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><ul><li>Use Command Line Interface:</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB> show version |
| show version |
| +---------------+ |
| |version | |
| +---------------+ |
| |x.x.x | |
| +---------------+ |
| Total line number = 1 |
| It costs 0.241s |
| </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></div></div><h2 id="where-can-i-find-iotdb-logs"><a href="#where-can-i-find-iotdb-logs" class="header-anchor">#</a> Where can I find IoTDB logs?</h2> <p>Suppose your root directory is:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>$ pwd |
| /workspace/iotdb |
| |
| $ ls -l |
| server/ |
| cli/ |
| pom.xml |
| Readme.md |
| ... |
| </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></div></div><p>Let <code>$IOTDB_HOME = /workspace/iotdb/server/target/iotdb-server-{project.version}</code></p> <p>Let <code>$IOTDB_CLI_HOME = /workspace/iotdb/cli/target/iotdb-cli-{project.version}</code></p> <p>By default settings, the logs are stored under <code>IOTDB_HOME/logs</code>. You can change log level and storage path by configuring <code>logback.xml</code> under <code>IOTDB_HOME/conf</code>.</p> <h2 id="where-can-i-find-iotdb-data-files"><a href="#where-can-i-find-iotdb-data-files" class="header-anchor">#</a> Where can I find IoTDB data files?</h2> <p>By default settings, the data files (including tsfile, metadata, and WAL files) are stored under <code>IOTDB_HOME/data</code>.</p> <h2 id="how-do-i-know-how-many-time-series-are-stored-in-iotdb"><a href="#how-do-i-know-how-many-time-series-are-stored-in-iotdb" class="header-anchor">#</a> How do I know how many time series are stored in IoTDB?</h2> <p>Use IoTDB's Command Line Interface:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB> show timeseries root |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>In the result, there is a statement shows <code>Total timeseries number</code>, this number is the timeseries number in IoTDB.</p> <p>In the current version, IoTDB supports querying the number of time series. Use IoTDB's Command Line Interface:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB> count timeseries root |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>If you are using Linux, you can use the following shell command:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>> grep "0,root" $IOTDB_HOME/data/system/schema/mlog.txt | wc -l |
| > 6 |
| </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="can-i-use-hadoop-and-spark-to-read-tsfile-in-iotdb"><a href="#can-i-use-hadoop-and-spark-to-read-tsfile-in-iotdb" class="header-anchor">#</a> Can I use Hadoop and Spark to read TsFile in IoTDB?</h2> <p>Yes. IoTDB has intense integration with Open Source Ecosystem. IoTDB supports <a href="https://github.com/apache/iotdb/tree/master/hadoop" target="_blank" rel="noopener noreferrer">Hadoop<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>, <a href="https://github.com/apache/iotdb/tree/master/spark" target="_blank" rel="noopener noreferrer">Spark<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> and <a href="https://github.com/apache/iotdb/tree/master/grafana" target="_blank" rel="noopener noreferrer">Grafana<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> visualization tool.</p> <h2 id="how-does-iotdb-handle-duplicate-points"><a href="#how-does-iotdb-handle-duplicate-points" class="header-anchor">#</a> How does IoTDB handle duplicate points?</h2> <p>A data point is uniquely identified by a full time series path (e.g. <code>root.vehicle.d0.s0</code>) and timestamp. If you submit a new point with the same path and timestamp as an existing point, IoTDB updates the value of this point instead of inserting a new point.</p> <h2 id="how-can-i-tell-what-type-of-the-specific-timeseries"><a href="#how-can-i-tell-what-type-of-the-specific-timeseries" class="header-anchor">#</a> How can I tell what type of the specific timeseries?</h2> <p>Use <code>SHOW TIMESERIES <timeseries path></code> SQL in IoTDB's Command Line Interface:</p> <p>For example, if you want to know the type of all timeseries, the <timeseries path> should be <code>root</code>. The statement will be:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB> show timeseries root |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>If you want to query specific sensor, you can replace the <timeseries path> with the sensor name. For example:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB> show timeseries root.fit.d1.s1 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Otherwise, you can also use wildcard in timeseries path:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB> show timeseries root.fit.d1.* |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h2 id="how-can-i-change-iotdb-s-cli-time-display-format"><a href="#how-can-i-change-iotdb-s-cli-time-display-format" class="header-anchor">#</a> How can I change IoTDB's Cli time display format?</h2> <p>The default IoTDB's Cli time display format is readable (e.g. <code>1970-01-01T08:00:00.001</code>), if you want to display time in timestamp type or other readable format, add parameter <code>-disableISO8601</code> in start command:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>> $IOTDB_CLI_HOME/sbin/start-cli.sh -h 127.0.0.1 -p 6667 -u root -pw root -disableISO8601 |
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