| (window.webpackJsonp=window.webpackJsonp||[]).push([[328],{726:function(e,t,s){"use strict";s.r(t);var a=s(29),n=Object(a.a)({},(function(){var e=this,t=e._self._c;return t("ContentSlotsDistributor",{attrs:{"slot-key":e.$parent.slotKey}},[t("h1",{attrs:{id:"continuous-query-cq"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#continuous-query-cq"}},[e._v("#")]),e._v(" Continuous Query, CQ")]),e._v(" "),t("p",[e._v("We can create, drop a CQ, and query all registered CQ configuration information through SQL statements.")]),e._v(" "),t("p",[e._v("Note that the current distributed version of IoTDB does not support continuous queries. Please stay tuned.")]),e._v(" "),t("h2",{attrs:{id:"sql-statements"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#sql-statements"}},[e._v("#")]),e._v(" SQL statements")]),e._v(" "),t("h3",{attrs:{id:"create-cq"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#create-cq"}},[e._v("#")]),e._v(" Create CQ")]),e._v(" "),t("h4",{attrs:{id:"syntax"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#syntax"}},[e._v("#")]),e._v(" Syntax")]),e._v(" "),t("div",{staticClass:"language-sql line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-sql"}},[t("code",[t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("CREATE")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("CONTINUOUS QUERY "),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("|")]),e._v(" CQ"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("<")]),e._v("cq_id"),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v(">")]),e._v(" \n"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("[")]),e._v("RESAMPLE EVERY "),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("<")]),e._v("every_interval"),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v(">")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("FOR")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("<")]),e._v("for_interval"),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v(">")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("]")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("BEGIN")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("SELECT")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("<")]),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("function")]),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v(">")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("<")]),e._v("path_suffix"),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v(">")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("INTO")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("<")]),e._v("full_path"),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v(">")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("|")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("<")]),e._v("node_name"),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v(">")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("FROM")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("<")]),e._v("path_prefix"),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v(">")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("GROUP")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("BY")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("time")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("<")]),e._v("group_by_interval"),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v(">")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("[")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(",")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("level")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("<")]),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("level")]),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v(">")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("]")]),e._v("\n"),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("END")]),e._v("\n")])]),e._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[e._v("1")]),t("br"),t("span",{staticClass:"line-number"},[e._v("2")]),t("br"),t("span",{staticClass:"line-number"},[e._v("3")]),t("br"),t("span",{staticClass:"line-number"},[e._v("4")]),t("br"),t("span",{staticClass:"line-number"},[e._v("5")]),t("br"),t("span",{staticClass:"line-number"},[e._v("6")]),t("br"),t("span",{staticClass:"line-number"},[e._v("7")]),t("br")])]),t("ul",[t("li",[t("p",[t("code",[e._v("<cq_id>")]),e._v(" specifies the globally unique id of CQ.")])]),e._v(" "),t("li",[t("p",[t("code",[e._v("<every_interval>")]),e._v(" specifies the query execution time interval. 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null|\n|root.ln.wf01.wt01.temperature| null| root.ln| FLOAT| GORILLA| SNAPPY|null| null|\n+-----------------------------+-----+-------------+--------+--------+-----------+----+----------+\n")])]),e._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[e._v("1")]),t("br"),t("span",{staticClass:"line-number"},[e._v("2")]),t("br"),t("span",{staticClass:"line-number"},[e._v("3")]),t("br"),t("span",{staticClass:"line-number"},[e._v("4")]),t("br"),t("span",{staticClass:"line-number"},[e._v("5")]),t("br"),t("span",{staticClass:"line-number"},[e._v("6")]),t("br"),t("span",{staticClass:"line-number"},[e._v("7")]),t("br"),t("span",{staticClass:"line-number"},[e._v("8")]),t("br")])]),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("+-----------------------------+-----------------------------+-----------------------------+-----------------------------+-----------------------------+\n| Time|root.ln.wf02.wt02.temperature|root.ln.wf02.wt01.temperature|root.ln.wf01.wt02.temperature|root.ln.wf01.wt01.temperature|\n+-----------------------------+-----------------------------+-----------------------------+-----------------------------+-----------------------------+\n|2021-05-11T22:18:14.598+08:00| 121.0| 72.0| 183.0| 115.0|\n|2021-05-11T22:18:19.941+08:00| 0.0| 68.0| 68.0| 103.0|\n|2021-05-11T22:18:24.949+08:00| 122.0| 45.0| 11.0| 14.0|\n|2021-05-11T22:18:29.967+08:00| 47.0| 14.0| 59.0| 181.0|\n|2021-05-11T22:18:34.979+08:00| 182.0| 113.0| 29.0| 180.0|\n|2021-05-11T22:18:39.990+08:00| 42.0| 11.0| 52.0| 19.0|\n|2021-05-11T22:18:44.995+08:00| 78.0| 38.0| 123.0| 52.0|\n|2021-05-11T22:18:49.999+08:00| 137.0| 172.0| 135.0| 193.0|\n|2021-05-11T22:18:55.003+08:00| 16.0| 124.0| 183.0| 18.0|\n+-----------------------------+-----------------------------+-----------------------------+-----------------------------+-----------------------------+\n")])]),e._v(" 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Result time series path configuration example")]),e._v(" "),t("p",[e._v("For the above original time series, if the user specifies that the query aggregation level is "),t("code",[e._v("2")]),e._v(", the aggregation function is "),t("code",[e._v("avg")]),e._v(",\nThe user can specify only the last node name of the generated time series in the "),t("code",[e._v("INTO")]),e._v(" clause. 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In the above example, "),t("code",[e._v("x")]),e._v(" should be less than or equal to "),t("code",[e._v("2")]),e._v(".")]),e._v(" "),t("h5",{attrs:{id:"create-cq1"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#create-cq1"}},[e._v("#")]),e._v(" Create "),t("code",[e._v("cq1")])]),e._v(" "),t("div",{staticClass:"language-sql line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-sql"}},[t("code",[t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("CREATE")]),e._v(" CONTINUOUS QUERY cq1 \n"),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("BEGIN")]),e._v(" \n "),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("SELECT")]),e._v(" max_value"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("temperature"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v(" \n "),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("INTO")]),e._v(" temperature_max \n "),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("FROM")]),e._v(" root"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("ln"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("*")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("*")]),e._v(" \n "),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("GROUP")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("BY")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("time")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),t("span",{pre:!0,attrs:{class:"token number"}},[e._v("10")]),e._v("s"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v(" \n"),t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("END")]),e._v("\n")])]),e._v(" 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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|\n+-----------------------------+---------------------------------+---------------------------------+---------------------------------+---------------------------------+\n|2021-05-11T22:18:16.964+08:00| 122.0| 68.0| 68.0| 103.0|\n|2021-05-11T22:18:26.964+08:00| 182.0| 113.0| 59.0| 181.0|\n|2021-05-11T22:18:36.964+08:00| 78.0| 38.0| 123.0| 52.0|\n|2021-05-11T22:18:46.964+08:00| 137.0| 172.0| 183.0| 193.0|\n+-----------------------------+---------------------------------+---------------------------------+---------------------------------+---------------------------------+\n")])]),e._v(" 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"),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[e._v("1")]),t("br"),t("span",{staticClass:"line-number"},[e._v("2")]),t("br"),t("span",{staticClass:"line-number"},[e._v("3")]),t("br"),t("span",{staticClass:"line-number"},[e._v("4")]),t("br"),t("span",{staticClass:"line-number"},[e._v("5")]),t("br"),t("span",{staticClass:"line-number"},[e._v("6")]),t("br"),t("span",{staticClass:"line-number"},[e._v("7")]),t("br")])]),t("p",[e._v("This example is almost identical to creating cq3. The difference is that in this example the user specified "),t("code",[e._v("BOUNDARY 2022-01-14T23:00:00.000+08:00")]),e._v(".")]),e._v(" "),t("p",[e._v("Note that the first execution time of this CQ is later than the time in the example, so "),t("code",[e._v("2022-01-14T23:00:20.000+08:00")]),e._v(" is the first execution time. Recursively, "),t("code",[e._v("2022-01-14T23:00:40.000+08:00")]),e._v(" is the second execution moment, "),t("code",[e._v("2022-01-14T23:01:00.000+08:00")]),e._v(" is the third execution moment...")]),e._v(" "),t("p",[e._v("The SQL statement executed at the first execution moment is "),t("code",[e._v("select avg(temperature) from root.ln.*.* group by ([2022-01-14T23:00:00.000+08:00, 2022-01-14T23:00: 20.000+08:00), 10s), level = 2")]),e._v(".")]),e._v(" "),t("p",[e._v("The SQL statement executed at the second execution moment is "),t("code",[e._v("select avg(temperature) from root.ln.*.* group by ([2022-01-14T23:00:20.000+08:00, 2022-01-14T23:00: 40.000+08:00), 10s), level = 2")]),e._v(".")]),e._v(" "),t("p",[e._v("The SQL statement executed at the third execution moment is "),t("code",[e._v("select avg(temperature) from root.ln.*.* group by ([2022-01-14T23:00:40.000+08:00, 2022-01-14T23:01: 00.000+08:00), 10s), level = 2")]),e._v(".")]),e._v(" "),t("p",[e._v("...")]),e._v(" "),t("h3",{attrs:{id:"show-cq-information"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#show-cq-information"}},[e._v("#")]),e._v(" Show CQ Information")]),e._v(" "),t("h4",{attrs:{id:"syntax-2"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#syntax-2"}},[e._v("#")]),e._v(" Syntax")]),e._v(" "),t("div",{staticClass:"language-sql line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-sql"}},[t("code",[t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("SHOW")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("CONTINUOUS QUERIES "),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("|")]),e._v(" CQS"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v(" \n")])]),e._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[e._v("1")]),t("br")])]),t("h4",{attrs:{id:"example-result"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#example-result"}},[e._v("#")]),e._v(" Example Result")]),e._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[e._v("+-------+--------------+------------+-------------+----------------------------------------------------------------------------------------+-----------------------------------+\n|cq name|every interval|for interval| boundary| query sql| target path|\n+-------+--------------+------------+-------------+----------------------------------------------------------------------------------------+-----------------------------------+\n| cq1| 10000| 10000|1642166102238| select max_value(temperature) from root.ln.*.* group by ([now() - 10s, now()), 10s)|root.${1}.${2}.${3}.temperature_max|\n| cq3| 20000| 20000|1642166118339|select avg(temperature) from root.ln.*.* group by ([now() - 20s, now()), 10s), level = 2| root.ln_cq.${2}.temperature_avg|\n| cq2| 20000| 20000|1642166111493|select avg(temperature) from root.ln.*.* group by ([now() - 20s, now()), 10s), level = 2| root.${1}.${2}.temperature_avg|\n| cq4| 20000| 20000|1642172400000|select avg(temperature) from root.ln.*.* group by ([now() - 20s, now()), 10s), level = 2| root.ln_cq.${2}.temperature_avg|\n+-------+--------------+------------+-------------+----------------------------------------------------------------------------------------+-----------------------------------+\n")])]),e._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[e._v("1")]),t("br"),t("span",{staticClass:"line-number"},[e._v("2")]),t("br"),t("span",{staticClass:"line-number"},[e._v("3")]),t("br"),t("span",{staticClass:"line-number"},[e._v("4")]),t("br"),t("span",{staticClass:"line-number"},[e._v("5")]),t("br"),t("span",{staticClass:"line-number"},[e._v("6")]),t("br"),t("span",{staticClass:"line-number"},[e._v("7")]),t("br"),t("span",{staticClass:"line-number"},[e._v("8")]),t("br")])]),t("h3",{attrs:{id:"drop-cq"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#drop-cq"}},[e._v("#")]),e._v(" Drop CQ")]),e._v(" "),t("h4",{attrs:{id:"syntax-3"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#syntax-3"}},[e._v("#")]),e._v(" Syntax")]),e._v(" "),t("div",{staticClass:"language-sql line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-sql"}},[t("code",[t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("DROP")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("CONTINUOUS QUERY "),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("|")]),e._v(" CQ"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v(" "),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v("<")]),e._v("cq_id"),t("span",{pre:!0,attrs:{class:"token operator"}},[e._v(">")]),e._v(" \n")])]),e._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[e._v("1")]),t("br")])]),t("h4",{attrs:{id:"example"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#example"}},[e._v("#")]),e._v(" Example")]),e._v(" "),t("div",{staticClass:"language-sql line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-sql"}},[t("code",[t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("DROP")]),e._v(" CONTINUOUS QUERY cq3\n")])]),e._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[e._v("1")]),t("br")])]),t("div",{staticClass:"language-sql line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-sql"}},[t("code",[t("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("DROP")]),e._v(" CQ cq3\n")])]),e._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[e._v("1")]),t("br")])]),t("h2",{attrs:{id:"system-parameter-configuration"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#system-parameter-configuration"}},[e._v("#")]),e._v(" System Parameter Configuration")]),e._v(" "),t("table",[t("thead",[t("tr",[t("th",{staticStyle:{"text-align":"left"}},[e._v("Name")]),e._v(" "),t("th",[e._v("Description")]),e._v(" "),t("th",[e._v("Data Type")]),e._v(" "),t("th",[e._v("Default Value")])])]),e._v(" "),t("tbody",[t("tr",[t("td",{staticStyle:{"text-align":"left"}},[t("code",[e._v("continuous_query_execution_thread")])]),e._v(" "),t("td",[e._v("The number of threads in the thread pool that executes continuous query tasks")]),e._v(" "),t("td",[e._v("int")]),e._v(" "),t("td",[e._v("max(1, CPU core number / 2)")])]),e._v(" "),t("tr",[t("td",{staticStyle:{"text-align":"left"}},[t("code",[e._v("max_pending_continuous_query_tasks")])]),e._v(" "),t("td",[e._v("The maximum number of continuous query tasks pending in queue")]),e._v(" "),t("td",[e._v("int")]),e._v(" "),t("td",[e._v("64")])]),e._v(" "),t("tr",[t("td",{staticStyle:{"text-align":"left"}},[t("code",[e._v("continuous_query_min_every_interval")])]),e._v(" "),t("td",[e._v("The minimum value of the continuous query execution time interval")]),e._v(" "),t("td",[e._v("duration")]),e._v(" "),t("td",[e._v("1s")])])])])])}),[],!1,null,null,null);t.default=n.exports}}]); |