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gitHub
<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用户手册 (v0.10.x)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>开始</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/zh/UserGuide/V0.10.x/Get Started/QuickStart.html" class="sidebar-link">快速入门</a></li><li><a href="/zh/UserGuide/V0.10.x/Get Started/Frequently asked questions.html" class="active sidebar-link">经常问的问题</a></li><li><a href="/zh/UserGuide/V0.10.x/Get Started/Publication.html" class="sidebar-link">调查报告</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>概述</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>概念</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>服务器端</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>客户端</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>操作指南</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>系统工具</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>生态集成</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>系统设计</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="常见问题"><a href="#常见问题" class="header-anchor">#</a> 常见问题</h1> <h2 id="概览"><a href="#概览" class="header-anchor">#</a> 概览</h2> <ul><li>常见问题
<ul><li>如何查询我的 IoTDB 版本？</li> <li>在哪里可以找到 IoTDB 的日志？</li> <li>在哪里可以找到 IoTDB 的数据文件？</li> <li>如何知道 IoTDB 中存储了多少时间序列？</li> <li>可以使用 Hadoop 和 Spark 读取 IoTDB 中的 TsFile 吗？</li> <li>IoTDB 如何处理重复的数据点？</li> <li>我如何知道具体的 timeseries 的类型？</li> <li>如何更改 IoTDB 的客户端时间显示格式？</li></ul></li></ul> <h2 id="如何查询我的-iotdb-版本"><a href="#如何查询我的-iotdb-版本" class="header-anchor">#</a> 如何查询我的 IoTDB 版本？</h2> <p>有几种方法可以识别您使用的 IoTDB 版本:</p> <p>*启动 IoTDB 的命令行界面:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>&gt; ./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>检查 pom.xml 文件:</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>&lt;version&gt;x.x.x&lt;/version&gt;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><ul><li>使用 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>使用命令行接口:</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB&gt; 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="在哪里可以找到-iotdb-的日志"><a href="#在哪里可以找到-iotdb-的日志" class="header-anchor">#</a> 在哪里可以找到 IoTDB 的日志？</h2> <p>假设您的根目录是:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>$ pwd
/workspace/incubator-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>假如 <code>$IOTDB_HOME = /workspace/incubator-iotdb/server/target/iotdb-server-{project.version}</code></p> <p>假如 <code>$IOTDB_CLI_HOME = /workspace/incubator-iotdb/cli/target/iotdb-cli-{project.version}</code></p> <p>在默认的设置里，logs 文件夹会被存储在<code>IOTDB_HOME/logs</code>。您可以在<code>IOTDB_HOME/conf</code>目录下的<code>logback.xml</code>文件中修改日志的级别和日志的存储路径。</p> <h2 id="在哪里可以找到-iotdb-的数据文件"><a href="#在哪里可以找到-iotdb-的数据文件" class="header-anchor">#</a> 在哪里可以找到 IoTDB 的数据文件？</h2> <p>在默认的设置里，数据文件（包含 TsFile，metadata，WAL）被存储在<code>IOTDB_HOME/data</code>文件夹。</p> <h2 id="如何知道-iotdb-中存储了多少时间序列"><a href="#如何知道-iotdb-中存储了多少时间序列" class="header-anchor">#</a> 如何知道 IoTDB 中存储了多少时间序列？</h2> <p>使用 IoTDB 的命令行接口:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB&gt; show timeseries root
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>在返回的结果里，会展示<code>Total timeseries number</code>，这个数据就是 IoTDB 中 timeseries 的数量。</p> <p>在当前版本中，IoTDB 支持直接使用命令行接口查询时间序列的数量:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB&gt; count timeseries root
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>如果您使用的是 Linux 操作系统，您可以使用以下的 Shell 命令:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>&gt; grep &quot;0,root&quot; $IOTDB_HOME/data/system/schema/mlog.txt | wc -l
&gt; 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="可以使用-hadoop-和-spark-读取-iotdb-中的-tsfile-吗"><a href="#可以使用-hadoop-和-spark-读取-iotdb-中的-tsfile-吗" class="header-anchor">#</a> 可以使用 Hadoop 和 Spark 读取 IoTDB 中的 TsFile 吗？</h2> <p>是的。IoTDB 与开源生态紧密结合。IoTDB 支持 <a href="https://github.com/apache/incubator-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/incubator-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> 和 <a href="https://github.com/apache/incubator-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> 可视化工具.</p> <h2 id="iotdb如何处理重复的数据点"><a href="#iotdb如何处理重复的数据点" class="header-anchor">#</a> IoTDB如何处理重复的数据点？</h2> <p>一个数据点是由一个完整的时间序列路径(例如:<code>root.vehicle.d0.s0</code>)和时间戳唯一标识的。如果您使用与现有点相同的路径和时间戳提交一个新点，那么IoTDB将更新这个点的值，而不是插入一个新点。</p> <h2 id="我如何知道具体的-timeseries-的类型"><a href="#我如何知道具体的-timeseries-的类型" class="header-anchor">#</a> 我如何知道具体的 timeseries 的类型？</h2> <p>在 IoTDB 的命令行接口中使用 SQL <code>SHOW TIMESERIES &lt;timeseries path&gt;</code>:</p> <p>例如：如果您想知道所有 timeseries 的类型 &lt;timeseries path&gt; 应该为 <code>root</code>。上面的 SQL 应该修改为:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB&gt; show timeseries root
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>如果您想查询一个指定的时间序列, 您可以修改 &lt;timeseries path&gt; 为时间序列的完整路径。比如:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB&gt; show timeseries root.fit.d1.s1
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>您还可以在 timeseries 路径中使用通配符:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB&gt; show timeseries root.fit.d1.*
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h2 id="如何更改iotdb的客户端时间显示格式"><a href="#如何更改iotdb的客户端时间显示格式" class="header-anchor">#</a> 如何更改IoTDB的客户端时间显示格式？</h2> <p>IoTDB 客户端默认显示的时间是人类可读的(比如：<code>1970-01-01T08:00:00.001</code>)，如果您想显示是时间戳或者其他可读格式, 请在启动命令上添加参数<code>-disableIS08601</code>:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>&gt; $IOTDB_CLI_HOME/sbin/start-cli.sh -h 127.0.0.1 -p 6667 -u root -pw root -disableIS08601
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div></div> <div class="page-nav"><p class="inner"><span class="prev">
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