(window.webpackJsonp=window.webpackJsonp||[]).push([[65],{636:function(e,t,a){"use strict";a.r(t);var s=a(70),r=Object(s.a)({},(function(){var e=this,t=e.$createElement,a=e._self._c||t;return a("ContentSlotsDistributor",{attrs:{"slot-key":e.$parent.slotKey}},[a("h1",{attrs:{id:"continuous-query-cq"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#continuous-query-cq"}},[e._v("#")]),e._v(" Continuous Query, CQ")]),e._v(" "),a("p",[e._v("We can create, drop a CQ,\nand query all registered CQ configuration information through SQL statements.")]),e._v(" "),a("h2",{attrs:{id:"sql-statements"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#sql-statements"}},[e._v("#")]),e._v(" SQL statements")]),e._v(" "),a("h3",{attrs:{id:"create-cq"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#create-cq"}},[e._v("#")]),e._v(" Create CQ")]),e._v(" "),a("h4",{attrs:{id:"syntax"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#syntax"}},[e._v("#")]),e._v(" Syntax")]),e._v(" "),a("div",{staticClass:"language-sql line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-sql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("CREATE")]),e._v(" CONTINUOUS QUERY "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("<")]),e._v("cq_id"),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v(">")]),e._v(" \n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("[")]),e._v("RESAMPLE EVERY "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("<")]),e._v("every_interval"),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v(">")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("FOR")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("<")]),e._v("for_interval"),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v(">")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("]")]),e._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("BEGIN")]),e._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("SELECT")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("<")]),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("function")]),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v(">")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("<")]),e._v("path_suffix"),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v(">")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("INTO")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("<")]),e._v("full_path"),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v(">")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("|")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("<")]),e._v("node_name"),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v(">")]),e._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("FROM")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("<")]),e._v("path_prefix"),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v(">")]),e._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("GROUP")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("BY")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("time")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("<")]),e._v("group_by_interval"),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v(">")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("[")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(",")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("level")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("<")]),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("level")]),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v(">")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("]")]),e._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("END")]),e._v("\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br"),a("span",{staticClass:"line-number"},[e._v("5")]),a("br"),a("span",{staticClass:"line-number"},[e._v("6")]),a("br"),a("span",{staticClass:"line-number"},[e._v("7")]),a("br")])]),a("ul",[a("li",[a("code",[e._v("<cq_id>")]),e._v(" specifies the globally unique id of CQ.")]),e._v(" "),a("li",[a("code",[e._v("<every_interval>")]),e._v(" specifies the query execution time interval. 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root.ln|   FLOAT| GORILLA|     SNAPPY|null|      null|\n|root.ln.wf01.wt01.temperature| null|      root.ln|   FLOAT| GORILLA|     SNAPPY|null|      null|\n+-----------------------------+-----+-------------+--------+--------+-----------+----+----------+\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br"),a("span",{staticClass:"line-number"},[e._v("5")]),a("br"),a("span",{staticClass:"line-number"},[e._v("6")]),a("br"),a("span",{staticClass:"line-number"},[e._v("7")]),a("br"),a("span",{staticClass:"line-number"},[e._v("8")]),a("br")])]),a("div",{staticClass:"language- 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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(" "),a("p",[e._v("For the above original time series, if the user specifies that the query aggregation level is "),a("code",[e._v("2")]),e._v(", the aggregation function is "),a("code",[e._v("avg")]),e._v(",\nThe user can specify only the last node name of the generated time series in the "),a("code",[e._v("INTO")]),e._v(" clause. If the user specifies it as "),a("code",[e._v("temperature_avg")]),e._v(", the full path generated by the system will be "),a("code",[e._v("root.${1}.${2}.temperature_avg")]),e._v(" .\nThe user can also specify the full path in the "),a("code",[e._v("INTO")]),e._v(" clause, and the user can specify it as "),a("code",[e._v("root.${1}.${2}.temperature_avg")]),e._v(", "),a("code",[e._v("root.ln_cq.${2}.temperature_avg")]),e._v(", "),a("code",[e._v("root.${1}_cq.${2}.temperature_avg")]),e._v(", "),a("code",[e._v("root.${1}.${2}_cq.temperature_avg")]),e._v(" etc.,\nIt can also be specified as "),a("code",[e._v("root.${2}.${1}.temperature_avg")]),e._v(" and others as needed.\nIt should be noted that the "),a("code",[e._v("x")]),e._v(" in "),a("code",[e._v("${x}")]),e._v(" should be greater than or equal to "),a("code",[e._v("1")]),e._v(" and less than or equal to the value of "),a("code",[e._v("<level>")]),e._v("\n(If "),a("code",[e._v("<level>")]),e._v(" is not specified, it should be less than or equal to the length of "),a("code",[e._v("<path_prefix>")]),e._v("). In the above example, "),a("code",[e._v("x")]),e._v(" should be less than or equal to "),a("code",[e._v("2")]),e._v(".")]),e._v(" "),a("h5",{attrs:{id:"create-cq1"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#create-cq1"}},[e._v("#")]),e._v(" Create "),a("code",[e._v("cq1")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("CREATE CONTINUOUS QUERY cq1 BEGIN SELECT max_value(temperature) INTO temperature_max FROM root.ln.*.* GROUP BY time(10s) END\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br")])]),a("p",[e._v("Query the maximum value of "),a("code",[e._v("root.ln.*.*.temperature")]),e._v(" in the previous 10s every 10s (the results are grouped by 10s),\nand the results will be written to "),a("code",[e._v("root.${1}.${2}.${3}.temperature_max")]),e._v(",\nAs a result, 4 new time series will be generated.")]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("+---------------------------------+-----+-------------+--------+--------+-----------+----+----------+\n|                       timeseries|alias|storage group|dataType|encoding|compression|tags|attributes|\n+---------------------------------+-----+-------------+--------+--------+-----------+----+----------+\n|root.ln.wf02.wt02.temperature_max| null|      root.ln|   FLOAT| GORILLA|     SNAPPY|null|      null|\n|root.ln.wf02.wt01.temperature_max| null|      root.ln|   FLOAT| GORILLA|     SNAPPY|null|      null|\n|root.ln.wf01.wt02.temperature_max| null|      root.ln|   FLOAT| GORILLA|     SNAPPY|null|      null|\n|root.ln.wf01.wt01.temperature_max| null|      root.ln|   FLOAT| GORILLA|     SNAPPY|null|      null|\n+---------------------------------+-----+-------------+--------+--------+-----------+----+----------+\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br"),a("span",{staticClass:"line-number"},[e._v("5")]),a("br"),a("span",{staticClass:"line-number"},[e._v("6")]),a("br"),a("span",{staticClass:"line-number"},[e._v("7")]),a("br"),a("span",{staticClass:"line-number"},[e._v("8")]),a("br")])]),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("+-----------------------------+---------------------------------+---------------------------------+---------------------------------+---------------------------------+\n|                         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(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br"),a("span",{staticClass:"line-number"},[e._v("5")]),a("br"),a("span",{staticClass:"line-number"},[e._v("6")]),a("br"),a("span",{staticClass:"line-number"},[e._v("7")]),a("br"),a("span",{staticClass:"line-number"},[e._v("8")]),a("br")])]),a("h5",{attrs:{id:"create-cq2"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#create-cq2"}},[e._v("#")]),e._v(" Create "),a("code",[e._v("cq2")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("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\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br")])]),a("p",[e._v("Query the average value of "),a("code",[e._v("root.ln.*.*.temperature")]),e._v(" in the previous 20s every 20s (the results are grouped by 10s),\nand the results will be written to "),a("code",[e._v("root.${1}.${2}.temperature_avg")]),e._v(",\nAs a result, 2 new time series will be generated.\nAmong them, "),a("code",[e._v("root.ln.wf02.temperature_avg")]),e._v(" is generated by the aggregation calculation of "),a("code",[e._v("root.ln.wf02.wt02.temperature")]),e._v(" and "),a("code",[e._v("root.ln.wf02.wt01.temperature")]),e._v(",\nand "),a("code",[e._v("root.ln.wf01.temperature_avg")]),e._v(" is generated by the aggregation calculation of "),a("code",[e._v("root.ln.wf01.wt02.temperature")]),e._v(" and 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112.25|\n|2021-05-11T22:18:36.969+08:00|                       42.25|                        61.5|\n|2021-05-11T22:18:46.969+08:00|                      112.25|                      132.25|\n+-----------------------------+----------------------------+----------------------------+\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br"),a("span",{staticClass:"line-number"},[e._v("5")]),a("br"),a("span",{staticClass:"line-number"},[e._v("6")]),a("br"),a("span",{staticClass:"line-number"},[e._v("7")]),a("br"),a("span",{staticClass:"line-number"},[e._v("8")]),a("br")])]),a("h5",{attrs:{id:"create-cq3"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#create-cq3"}},[e._v("#")]),e._v(" Create "),a("code",[e._v("cq3")])]),e._v(" 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"),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br"),a("span",{staticClass:"line-number"},[e._v("5")]),a("br"),a("span",{staticClass:"line-number"},[e._v("6")]),a("br")])]),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("+-----------------------------+-------------------------------+-------------------------------+\n|                         Time|root.ln_cq.wf02.temperature_avg|root.ln_cq.wf01.temperature_avg|\n+-----------------------------+-------------------------------+-------------------------------+\n|2021-05-11T22:18:16.971+08:00|                          58.75|                           49.0|\n|2021-05-11T22:18:26.971+08:00|                           89.0|                         112.25|\n|2021-05-11T22:18:36.971+08:00|                          42.25|                           61.5|\n|2021-05-11T22:18:46.971+08:00|                         112.25|                         132.25|\n+-----------------------------+-------------------------------+-------------------------------+\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br"),a("span",{staticClass:"line-number"},[e._v("5")]),a("br"),a("span",{staticClass:"line-number"},[e._v("6")]),a("br"),a("span",{staticClass:"line-number"},[e._v("7")]),a("br"),a("span",{staticClass:"line-number"},[e._v("8")]),a("br")])]),a("h3",{attrs:{id:"show-cq-information"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#show-cq-information"}},[e._v("#")]),e._v(" Show CQ Information")]),e._v(" 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target path|\n+-------+--------------+------------+----------------------------------------------------------------------------------------+-----------------------------------+\n|    cq1|         10000|       10000|     select max_value(temperature) from root.ln.*.* group by ([now() - 10s, now()), 10s)|root.${1}.${2}.${3}.temperature_max|\n|    cq3|         20000|       20000|select avg(temperature) from root.ln.*.* group by ([now() - 20s, now()), 10s), level = 2|    root.ln_cq.${2}.temperature_avg|\n|    cq2|         20000|       20000|select avg(temperature) from root.ln.*.* group by ([now() - 20s, now()), 10s), level = 2|     root.${1}.${2}.temperature_avg|\n+-------+--------------+------------+----------------------------------------------------------------------------------------+-----------------------------------+\n")])]),e._v(" 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"),a("table",[a("thead",[a("tr",[a("th",{staticStyle:{"text-align":"left"}},[e._v("Name")]),e._v(" "),a("th",[e._v("Description")]),e._v(" "),a("th",[e._v("Data Type")]),e._v(" "),a("th",[e._v("Default Value")])])]),e._v(" "),a("tbody",[a("tr",[a("td",{staticStyle:{"text-align":"left"}},[a("code",[e._v("continuous_query_execution_thread")])]),e._v(" "),a("td",[e._v("The number of threads in the thread pool that executes continuous query tasks")]),e._v(" "),a("td",[e._v("int")]),e._v(" "),a("td",[e._v("max(1, CPU core number / 2)")])]),e._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"left"}},[a("code",[e._v("max_pending_continuous_query_tasks")])]),e._v(" "),a("td",[e._v("The maximum number of continuous query tasks pending in queue")]),e._v(" "),a("td",[e._v("int")]),e._v(" "),a("td",[e._v("64")])]),e._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"left"}},[a("code",[e._v("continuous_query_min_every_interval")])]),e._v(" "),a("td",[e._v("The minimum value of the continuous query execution time interval")]),e._v(" "),a("td",[e._v("duration")]),e._v(" "),a("td",[e._v("1s")])])])])])}),[],!1,null,null,null);t.default=r.exports}}]);