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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 (In progress)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>IoTDB简介</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>快速上手</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>数据模式与概念</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>SQL命令行终端(CLI)</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>权限管理</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>IoTDB-SQL 语言</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>应用编程接口</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>高级功能</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/zh/UserGuide/Master/Advanced-Features/UDF-User-Defined-Function.html" class="sidebar-link">用户定义函数(UDF)</a></li><li><a href="/zh/UserGuide/Master/Advanced-Features/Continuous-Query.html" aria-current="page" class="active sidebar-link">连续查询(CQ)</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>通信服务协议</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>端云协同</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>系统集成</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>集群搭建</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>常见问题</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>附录</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>时间序列数据库比较</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="连续查询-continuous-query-cq"><a href="#连续查询-continuous-query-cq" class="header-anchor">#</a> 连续查询（Continuous Query, CQ）</h1> <p>我们可以通过 SQL 语句注册、或卸载一个 CQ 实例，以及查询到所有已经注册的 CQ 配置信息。</p> <h2 id="sql-语句"><a href="#sql-语句" class="header-anchor">#</a> SQL 语句</h2> <h3 id="创建-cq"><a href="#创建-cq" class="header-anchor">#</a> 创建 CQ</h3> <h4 id="语法"><a href="#语法" class="header-anchor">#</a> 语法</h4> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">CREATE</span> CONTINUOUS QUERY <span class="token operator"><</span>cq_id<span class="token operator">></span> |
| <span class="token punctuation">[</span>RESAMPLE EVERY <span class="token operator"><</span>every_interval<span class="token operator">></span> <span class="token keyword">FOR</span> <span class="token operator"><</span>for_interval<span class="token operator">></span><span class="token punctuation">]</span> |
| <span class="token keyword">BEGIN</span> |
| <span class="token keyword">SELECT</span> <span class="token operator"><</span><span class="token keyword">function</span><span class="token operator">></span><span class="token punctuation">(</span><span class="token operator"><</span>path_suffix<span class="token operator">></span><span class="token punctuation">)</span> <span class="token keyword">INTO</span> <span class="token operator"><</span>full_path<span class="token operator">></span> <span class="token operator">|</span> <span class="token operator"><</span>node_name<span class="token operator">></span> |
| <span class="token keyword">FROM</span> <span class="token operator"><</span>path_prefix<span class="token operator">></span> |
| <span class="token keyword">GROUP</span> <span class="token keyword">BY</span> <span class="token keyword">time</span><span class="token punctuation">(</span><span class="token operator"><</span>group_by_interval<span class="token operator">></span><span class="token punctuation">)</span> <span class="token punctuation">[</span><span class="token punctuation">,</span> <span class="token keyword">level</span> <span class="token operator">=</span> <span class="token operator"><</span><span class="token keyword">level</span><span class="token operator">></span><span class="token punctuation">]</span> |
| <span class="token keyword">END</span> |
| </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><p>其中：</p> <ul><li><code><cq_id></code> 指定 CQ 全局唯一的 id。</li> <li><code><every_interval></code> 指定查询执行时间间隔，支持 ns、us、ms、s、m、h、d、w 等单位，其值不应小于用户所配置的 <code>continuous_query_min_every_interval</code> 值。可选择指定。</li> <li><code><for_interval></code> 指定每次查询的窗口大小，即查询时间范围为<code>[now() - <for_interval>, now())</code>，其中 <code>now()</code> 指查询时的时间戳。支持 ns、us、ms、s、m、h |
| 、d、w 等单位。可选择指定。</li> <li><code><function></code> 指定聚合函数，目前支持 <code>count</code>, <code>sum</code>, <code>avg</code>, <code>last_value</code>, <code>first_value</code>, <code>min_time</code>, <code>max_time</code>, <code>min_value</code>, <code>max_value</code> 等。</li> <li><code><path_prefix></code> 与 <code><path_suffix></code> 拼接成完整的查询原时间序列。</li> <li><code><full_path></code> 或 <code><node_name></code> 指定将查询出的数据写入的结果序列路径。</li> <li><code><group_by_interval></code> 指定时间分组长度，支持 ns、us、ms、s、m、h |
| 、d、w、mo、y 等单位。</li> <li><code><level></code>指按照序列第 <code><level></code> 层分组，将第 <code><level></code> 层以下的所有序列聚合。Group By Level 语句的具体语义及 <code><level></code> 的定义见 <a href="/zh/UserGuide/Master/IoTDB-SQL-Language/DML-Data-Manipulation-Language.html">路径层级分组聚合</a>。</li></ul> <p>注：</p> <ul><li><code><for_interval></code>,<code><every_interval></code> 可选择指定。如果用户没有指定其中的某一项，则未指定项的值按照<code><group_by_interval></code> 处理。 |
| <ul><li><code><every_interval></code>，<code><for_interval></code>，<code><group_by_interval></code> 的值均应大于 0。</li> <li><code><group_by_interval></code> 的值应小于<code><for_interval></code>的值，否则系统会按照等于<code><for_interval></code>的值处理。</li> <li>用户应当结合实际需求指定合适的 <code><for_interval></code> 与 <code><every_interval></code>。 |
| <ul><li>若 <code><for_interval></code> 大于 <code><every_interval></code>，每次的查询窗口会有部分数据重叠，从查询性能角度这种配置不被建议。</li> <li>若 <code><for_interval></code> 小于 <code><every_interval></code>，每次的查询窗口之间可能会有未覆盖到的数据。</li></ul></li></ul></li> <li>对于结果序列路径 |
| <ul><li>用户可以选择指定<code><full_path></code>，即以 <code>root</code> 开头的完整的时间序列路径，用户可以在路径中使用 <code>${x}</code> 变量来表示原始时间序列中 <code>level = x</code> 的节点名称，<code>x</code>应当大于等于 1 且小于等于 <code><level></code> 值 |
| （若未指定 <code>level</code>，则应小于等于 <code><path_prefix></code> 长度）。</li> <li>用户也可以仅指定<code><node_name></code>，即生成时间序列路径的最后一个结点名。 |
| <ul><li>若用户指定 <code><level> = l</code>，则系统生成的结果时间序列路径为 <code>root.${1}. ... .${l}.<node_name></code></li> <li>若用户未指定 <code><level></code>，令原始时间序列最大层数为 <code>L</code>， |
| 则系统生成的结果时间序列路径为 <code>root.${1}. ... .${L - 1}.<node_name></code>。</li></ul></li></ul></li></ul> <h4 id="示例"><a href="#示例" class="header-anchor">#</a> 示例</h4> <h5 id="原始时间序列"><a href="#原始时间序列" class="header-anchor">#</a> 原始时间序列</h5> <div class="language- line-numbers-mode"><pre class="language-text"><code>+-----------------------------+-----+-------------+--------+--------+-----------+----+----------+ |
| | timeseries|alias|storage group|dataType|encoding|compression|tags|attributes| |
| +-----------------------------+-----+-------------+--------+--------+-----------+----+----------+ |
| |root.ln.wf02.wt02.temperature| null| root.ln| FLOAT| GORILLA| SNAPPY|null| null| |
| |root.ln.wf02.wt01.temperature| null| root.ln| FLOAT| GORILLA| SNAPPY|null| null| |
| |root.ln.wf01.wt02.temperature| null| root.ln| FLOAT| GORILLA| SNAPPY|null| null| |
| |root.ln.wf01.wt01.temperature| null| root.ln| FLOAT| GORILLA| SNAPPY|null| null| |
| +-----------------------------+-----+-------------+--------+--------+-----------+----+----------+ |
| </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></div></div><div class="language- line-numbers-mode"><pre class="language-text"><code>+-----------------------------+-----------------------------+-----------------------------+-----------------------------+-----------------------------+ |
| | Time|root.ln.wf02.wt02.temperature|root.ln.wf02.wt01.temperature|root.ln.wf01.wt02.temperature|root.ln.wf01.wt01.temperature| |
| +-----------------------------+-----------------------------+-----------------------------+-----------------------------+-----------------------------+ |
| |2021-05-11T22:18:14.598+08:00| 121.0| 72.0| 183.0| 115.0| |
| |2021-05-11T22:18:19.941+08:00| 0.0| 68.0| 68.0| 103.0| |
| |2021-05-11T22:18:24.949+08:00| 122.0| 45.0| 11.0| 14.0| |
| |2021-05-11T22:18:29.967+08:00| 47.0| 14.0| 59.0| 181.0| |
| |2021-05-11T22:18:34.979+08:00| 182.0| 113.0| 29.0| 180.0| |
| |2021-05-11T22:18:39.990+08:00| 42.0| 11.0| 52.0| 19.0| |
| |2021-05-11T22:18:44.995+08:00| 78.0| 38.0| 123.0| 52.0| |
| |2021-05-11T22:18:49.999+08:00| 137.0| 172.0| 135.0| 193.0| |
| |2021-05-11T22:18:55.003+08:00| 16.0| 124.0| 183.0| 18.0| |
| +-----------------------------+-----------------------------+-----------------------------+-----------------------------+-----------------------------+ |
| </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><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br></div></div><h5 id="结果序列配置举例说明"><a href="#结果序列配置举例说明" class="header-anchor">#</a> 结果序列配置举例说明</h5> <p>对于以上原始时间序列，若用户指定查询聚合层级为 <code>2</code>，聚合函数为 <code>avg</code>， |
| 用户可以在 <code>INTO</code> 语句中仅指定生成序列的最后一个结点名，若用户将其指定为 <code>temperature_avg</code>，则系统生成的完整路径为 <code>root.${1}.${2}.temperature_avg</code>。 |
| 用户也可以在 <code>INTO</code> 语句中指定完整写入路径，用户可将其指定为 <code>root.${1}.${2}.temperature_avg</code>、<code>root.ln_cq.${2}.temperature_avg</code>、<code>root.${1}_cq.${2}.temperature_avg</code>、<code>root.${1}.${2}_cq.temperature_avg</code>等， |
| 也可以按需要指定为 <code>root.${2}.${1}.temperature_avg</code> 等其它形式。 |
| 需要注意的是，<code>${x}</code> 中的 <code>x</code> 应当大于等于 <code>1</code> 且小于等于 <code><level></code> 值 |
| （若未指定 <code><level></code>，则应小于等于 <code><path_prefix></code> 层级）。在上例中，<code>x</code> 应当小于等于 <code>2</code>。</p> <h5 id="创建-cq1"><a href="#创建-cq1" class="header-anchor">#</a> 创建 <code>cq1</code></h5> <div class="language- line-numbers-mode"><pre class="language-text"><code>CREATE CONTINUOUS QUERY cq1 BEGIN SELECT max_value(temperature) INTO temperature_max FROM root.ln.*.* GROUP BY time(10s) END |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>每隔 10s 查询 <code>root.ln.*.*.temperature</code> 在前 10s 内的最大值（结果以10s为一组）， |
| 将结果写入到 <code>root.${1}.${2}.${3}.temperature_max</code> 中， |
| 结果将产生4条新序列：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>+---------------------------------+-----+-------------+--------+--------+-----------+----+----------+ |
| | timeseries|alias|storage group|dataType|encoding|compression|tags|attributes| |
| +---------------------------------+-----+-------------+--------+--------+-----------+----+----------+ |
| |root.ln.wf02.wt02.temperature_max| null| root.ln| FLOAT| GORILLA| SNAPPY|null| null| |
| |root.ln.wf02.wt01.temperature_max| null| root.ln| FLOAT| GORILLA| SNAPPY|null| null| |
| |root.ln.wf01.wt02.temperature_max| null| root.ln| FLOAT| GORILLA| SNAPPY|null| null| |
| |root.ln.wf01.wt01.temperature_max| null| root.ln| FLOAT| GORILLA| SNAPPY|null| null| |
| +---------------------------------+-----+-------------+--------+--------+-----------+----+----------+ |
| </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></div></div><div class="language- line-numbers-mode"><pre class="language-text"><code>+-----------------------------+---------------------------------+---------------------------------+---------------------------------+---------------------------------+ |
| | Time|root.ln.wf02.wt02.temperature_max|root.ln.wf02.wt01.temperature_max|root.ln.wf01.wt02.temperature_max|root.ln.wf01.wt01.temperature_max| |
| +-----------------------------+---------------------------------+---------------------------------+---------------------------------+---------------------------------+ |
| |2021-05-11T22:18:16.964+08:00| 122.0| 68.0| 68.0| 103.0| |
| |2021-05-11T22:18:26.964+08:00| 182.0| 113.0| 59.0| 181.0| |
| |2021-05-11T22:18:36.964+08:00| 78.0| 38.0| 123.0| 52.0| |
| |2021-05-11T22:18:46.964+08:00| 137.0| 172.0| 183.0| 193.0| |
| +-----------------------------+---------------------------------+---------------------------------+---------------------------------+---------------------------------+ |
| </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></div></div><h5 id="创建-cq2"><a href="#创建-cq2" class="header-anchor">#</a> 创建 <code>cq2</code></h5> <div class="language- line-numbers-mode"><pre class="language-text"><code>CREATE CONTINUOUS QUERY cq2 RESAMPLE EVERY 20s FOR 20s BEGIN SELECT avg(temperature) INTO temperature_avg FROM root.ln.*.* GROUP BY time(10s), level=2 END |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>每隔 20s 查询 <code>root.ln.*.*.temperature</code> 在前 20s 内的平均值（结果以10s为一组，按照第2层节点分组）， |
| 将结果写入到 <code>root.${1}.${2}.temperature_avg</code> 中。 |
| 结果将产生如下两条新序列， |
| 其中 <code>root.ln.wf02.temperature_avg</code> 由 <code>root.ln.wf02.wt02.temperature</code> 和 <code>root.ln.wf02.wt01.temperature</code> 聚合计算生成， |
| <code>root.ln.wf01.temperature_avg</code> 由 <code>root.ln.wf01.wt02.temperature</code> 和 <code>root.ln.wf01.wt01.temperature</code> 聚合计算生成。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>+----------------------------+-----+-------------+--------+--------+-----------+----+----------+ |
| | timeseries|alias|storage group|dataType|encoding|compression|tags|attributes| |
| +----------------------------+-----+-------------+--------+--------+-----------+----+----------+ |
| |root.ln.wf02.temperature_avg| null| root.ln| DOUBLE| GORILLA| SNAPPY|null| null| |
| |root.ln.wf01.temperature_avg| null| root.ln| DOUBLE| GORILLA| SNAPPY|null| null| |
| +----------------------------+-----+-------------+--------+--------+-----------+----+----------+ |
| </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></div></div><div class="language- line-numbers-mode"><pre class="language-text"><code>+-----------------------------+----------------------------+----------------------------+ |
| | Time|root.ln.wf02.temperature_avg|root.ln.wf01.temperature_avg| |
| +-----------------------------+----------------------------+----------------------------+ |
| |2021-05-11T22:18:16.969+08:00| 58.75| 49.0| |
| |2021-05-11T22:18:26.969+08:00| 89.0| 112.25| |
| |2021-05-11T22:18:36.969+08:00| 42.25| 61.5| |
| |2021-05-11T22:18:46.969+08:00| 112.25| 132.25| |
| +-----------------------------+----------------------------+----------------------------+ |
| </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></div></div><h5 id="创建-cq3"><a href="#创建-cq3" class="header-anchor">#</a> 创建 <code>cq3</code></h5> <div class="language- line-numbers-mode"><pre class="language-text"><code>CREATE CONTINUOUS QUERY cq3 RESAMPLE EVERY 20s FOR 20s BEGIN SELECT avg(temperature) INTO root.ln_cq.${2}.temperature_avg FROM root.ln.*.* GROUP BY time(10s), level=2 END |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>查询模式与 cq2 相同，在这个例子中，用户自行指定结果写入到 <code>root.ln_cq.${2}.temperature_avg</code> 中。 |
| 结果将产生如下两条新序列， |
| 其中 <code>root.ln_cq.wf02.temperature_avg</code> 由 <code>root.ln.wf02.wt02.temperature</code> 和 <code>root.ln.wf02.wt01.temperature</code> 聚合计算生成， |
| <code>root.ln_cq.wf01.temperature_avg</code> 由 <code>root.ln.wf01.wt02.temperature</code> 和 <code>root.ln.wf01.wt01.temperature</code> 聚合计算生成。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>+-------------------------------+-----+-------------+--------+--------+-----------+----+----------+ |
| | timeseries|alias|storage group|dataType|encoding|compression|tags|attributes| |
| +-------------------------------+-----+-------------+--------+--------+-----------+----+----------+ |
| |root.ln_cq.wf02.temperature_avg| null| root.ln_cq| DOUBLE| GORILLA| SNAPPY|null| null| |
| |root.ln_cq.wf01.temperature_avg| null| root.ln_cq| DOUBLE| GORILLA| SNAPPY|null| null| |
| +-------------------------------+-----+-------------+--------+--------+-----------+----+----------+ |
| </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></div></div><div class="language- line-numbers-mode"><pre class="language-text"><code>+-----------------------------+-------------------------------+-------------------------------+ |
| | Time|root.ln_cq.wf02.temperature_avg|root.ln_cq.wf01.temperature_avg| |
| +-----------------------------+-------------------------------+-------------------------------+ |
| |2021-05-11T22:18:16.971+08:00| 58.75| 49.0| |
| |2021-05-11T22:18:26.971+08:00| 89.0| 112.25| |
| |2021-05-11T22:18:36.971+08:00| 42.25| 61.5| |
| |2021-05-11T22:18:46.971+08:00| 112.25| 132.25| |
| +-----------------------------+-------------------------------+-------------------------------+ |
| </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></div></div><h3 id="展示-cq-信息"><a href="#展示-cq-信息" class="header-anchor">#</a> 展示 CQ 信息</h3> <h4 id="语法-2"><a href="#语法-2" class="header-anchor">#</a> 语法</h4> <div class="language- line-numbers-mode"><pre class="language-text"><code>SHOW CONTINUOUS QUERIES |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h4 id="结果示例"><a href="#结果示例" class="header-anchor">#</a> 结果示例</h4> <div class="language- line-numbers-mode"><pre class="language-text"><code>+-------+--------------+------------+----------------------------------------------------------------------------------------+-----------------------------------+ |
| |cq name|every interval|for interval| query sql| target path| |
| +-------+--------------+------------+----------------------------------------------------------------------------------------+-----------------------------------+ |
| | cq1| 10000| 10000| select max_value(temperature) from root.ln.*.* group by ([now() - 10s, now()), 10s)|root.${1}.${2}.${3}.temperature_max| |
| | cq3| 20000| 20000|select avg(temperature) from root.ln.*.* group by ([now() - 20s, now()), 10s), level = 2| root.ln_cq.${2}.temperature_avg| |
| | cq2| 20000| 20000|select avg(temperature) from root.ln.*.* group by ([now() - 20s, now()), 10s), level = 2| root.${1}.${2}.temperature_avg| |
| +-------+--------------+------------+----------------------------------------------------------------------------------------+-----------------------------------+ |
| </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><h3 id="删除-cq"><a href="#删除-cq" class="header-anchor">#</a> 删除 CQ</h3> <h4 id="语法-3"><a href="#语法-3" class="header-anchor">#</a> 语法</h4> <div class="language- line-numbers-mode"><pre class="language-text"><code>DROP CONTINUOUS QUERY <cq_id> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h4 id="示例-2"><a href="#示例-2" class="header-anchor">#</a> 示例</h4> <div class="language- line-numbers-mode"><pre class="language-text"><code>DROP CONTINUOUS QUERY cq3 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h2 id="系统参数配置"><a href="#系统参数配置" class="header-anchor">#</a> 系统参数配置</h2> <table><thead><tr><th style="text-align:left;">参数名</th> <th>描述</th> <th>数据类型</th> <th>默认值</th></tr></thead> <tbody><tr><td style="text-align:left;"><code>continuous_query_execution_thread</code></td> <td>执行连续查询任务的线程池的线程数</td> <td>int</td> <td>max(1, CPU 核数 / 2)</td></tr> <tr><td style="text-align:left;"><code>max_pending_continuous_query_tasks</code></td> <td>队列中连续查询最大任务堆积数</td> <td>int</td> <td>64</td></tr> <tr><td style="text-align:left;"><code>continuous_query_min_every_interval</code></td> <td>连续查询执行时间间隔的最小值</td> <td>duration</td> <td>1s</td></tr></tbody></table></div> <div class="page-nav"><p class="inner"><span class="prev"> |
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