| import{_ as s,r as o,o as r,c as d,b as t,d as e,a as n,e as a}from"./app-Bx8hKGcu.js";const l={},c=a(`<h1 id="frequently-asked-questions" tabindex="-1"><a class="header-anchor" href="#frequently-asked-questions"><span>Frequently Asked Questions</span></a></h1><p><strong>How can I identify my version of IoTDB?</strong></p><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-text line-numbers-mode" data-ext="text" data-title="text"><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" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>Check pom.xml file:</li></ul><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code><version>x.x.x</version> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>Use JDBC API:</li></ul><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>String iotdbVersion = tsfileDatabaseMetadata.getDatabaseProductVersion(); |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>Use Command Line Interface:</li></ul><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><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" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p><strong>Where can I find IoTDB logs?</strong></p><p>Suppose your root directory is:</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>$ pwd |
| /workspace/iotdb |
| |
| $ ls -l |
| server/ |
| cli/ |
| pom.xml |
| Readme.md |
| ... |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></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><p><strong>Where can I find IoTDB data files?</strong></p><p>By default settings, the data files (including tsfile, metadata, and WAL files) are stored under <code>IOTDB_HOME/data</code>.</p><p><strong>How do I know how many time series are stored in IoTDB?</strong></p><p>Use IoTDB's Command Line Interface:</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>IoTDB> show timeseries root |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></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-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>IoTDB> count timeseries root |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>If you are using Linux, you can use the following shell command:</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>> grep "0,root" $IOTDB_HOME/data/system/schema/mlog.txt | wc -l |
| > 6 |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><p><strong>Can I use Hadoop and Spark to read TsFile in IoTDB?</strong></p>`,28),u={href:"https://github.com/apache/iotdb/tree/master/hadoop",target:"_blank",rel:"noopener noreferrer"},m={href:"https://github.com/apache/iotdb/tree/master/spark",target:"_blank",rel:"noopener noreferrer"},p={href:"https://github.com/apache/iotdb/tree/master/grafana",target:"_blank",rel:"noopener noreferrer"},v=a(`<p><strong>How does IoTDB handle duplicate points?</strong></p><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><p><strong>How can I tell what type of the specific timeseries?</strong></p><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-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>IoTDB> show timeseries root |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></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-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>IoTDB> show timeseries root.fit.d1.s1 |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>Otherwise, you can also use wildcard in timeseries path:</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>IoTDB> show timeseries root.fit.d1.* |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p><strong>How can I change IoTDB's Cli time display format?</strong></p><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-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>> $IOTDB_CLI_HOME/sbin/start-cli.sh -h 127.0.0.1 -p 6667 -u root -pw root -disableISO8601 |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div>`,13);function g(h,_){const i=o("ExternalLinkIcon");return r(),d("div",null,[c,t("p",null,[e("Yes. IoTDB has intense integration with Open Source Ecosystem. IoTDB supports "),t("a",u,[e("Hadoop"),n(i)]),e(", "),t("a",m,[e("Spark"),n(i)]),e(" and "),t("a",p,[e("Grafana"),n(i)]),e(" visualization tool.")]),v])}const x=s(l,[["render",g],["__file","Frequently-asked-questions.html.vue"]]),f=JSON.parse(`{"path":"/UserGuide/V0.13.x/Reference/Frequently-asked-questions.html","title":"Frequently Asked Questions","lang":"en-US","frontmatter":{"description":"Frequently Asked Questions How can I identify my version of IoTDB? There are several ways to identify the version of IoTDB that you are using: Launch IoTDB's Command Line Interf...","head":[["link",{"rel":"alternate","hreflang":"zh-cn","href":"https://iotdb.apache.org/zh/UserGuide/V0.13.x/Reference/Frequently-asked-questions.html"}],["meta",{"property":"og:url","content":"https://iotdb.apache.org/UserGuide/V0.13.x/Reference/Frequently-asked-questions.html"}],["meta",{"property":"og:site_name","content":"IoTDB Website"}],["meta",{"property":"og:title","content":"Frequently Asked Questions"}],["meta",{"property":"og:description","content":"Frequently Asked Questions How can I identify my version of IoTDB? There are several ways to identify the version of IoTDB that you are using: Launch IoTDB's Command Line Interf..."}],["meta",{"property":"og:type","content":"article"}],["meta",{"property":"og:locale","content":"en-US"}],["meta",{"property":"og:locale:alternate","content":"zh-CN"}],["meta",{"property":"og:updated_time","content":"2023-07-10T03:11:17.000Z"}],["meta",{"property":"article:modified_time","content":"2023-07-10T03:11:17.000Z"}],["script",{"type":"application/ld+json"},"{\\"@context\\":\\"https://schema.org\\",\\"@type\\":\\"Article\\",\\"headline\\":\\"Frequently Asked Questions\\",\\"image\\":[\\"\\"],\\"dateModified\\":\\"2023-07-10T03:11:17.000Z\\",\\"author\\":[]}"]]},"headers":[],"git":{"createdTime":1688958677000,"updatedTime":1688958677000,"contributors":[{"name":"CritasWang","email":"critas@outlook.com","commits":1}]},"readingTime":{"minutes":2.03,"words":610},"filePathRelative":"UserGuide/V0.13.x/Reference/Frequently-asked-questions.md","localizedDate":"July 10, 2023","autoDesc":true}`);export{x as comp,f as data}; |
