assets/js/500.a98dbca9.js

(window.webpackJsonp=window.webpackJsonp||[]).push([[500],{899:function(s,t,a){"use strict";a.r(t);var r=a(29),e=Object(r.a)({},(function(){var s=this,t=s._self._c;return t("ContentSlotsDistributor",{attrs:{"slot-key":s.$parent.slotKey}},[t("h1",{attrs:{id:"运维命令"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#运维命令"}},[s._v("#")]),s._v(" 运维命令")]),s._v(" "),t("h2",{attrs:{id:"flush"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#flush"}},[s._v("#")]),s._v(" FLUSH")]),s._v(" "),t("p",[s._v("将指定存储组的内存缓存区 Memory Table 的数据持久化到磁盘上，并将数据文件封口。在集群模式下，我们提供了持久化单个节点的指定存储组的缓存、持久化整个集群指定存储组的缓存命令。")]),s._v(" "),t("p",[s._v("注意：此命令客户端不需要手动调用，IoTDB 有 wal 保证数据安全，IoTDB 会选择合适的时机进行 flush。\n如果频繁调用 flush 会导致数据文件很小，降低查询性能。")]),s._v(" "),t("div",{staticClass:"language-sql line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-sql"}},[t("code",[s._v("IoTDB"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v(" FLUSH \nIoTDB"),t("span",{pre:!0,attrs:{class:"token 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"),t("p",[s._v("触发层级合并和乱序合并。当前 IoTDB 支持使用如下两种 SQL 手动触发数据文件的合并：")]),s._v(" "),t("ul",[t("li",[t("code",[s._v("MERGE")]),s._v(" 先触发层级合并，等层级合并执行完后，再触发乱序合并。在乱序合并中，仅重写重复的 Chunk，整理速度快，但是最终磁盘会存在多余数据。")]),s._v(" "),t("li",[t("code",[s._v("FULL MERGE")]),s._v(" 先触发层级合并，等层级合并执行完后，再触发乱序合并。在乱序合并中，将需要合并的顺序和乱序文件的所有数据都重新写一份，整理速度慢，最终磁盘将不存在无用的数据。")])]),s._v(" "),t("div",{staticClass:"language-sql line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-sql"}},[t("code",[s._v("IoTDB"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("MERGE")]),s._v("\nIoTDB"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("FULL")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("MERGE")]),s._v("\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br")])]),t("p",[s._v("同时，在集群模式中支持对单个节点或整个集群手动触发数据文件的合并:")]),s._v(" "),t("div",{staticClass:"language-sql line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-sql"}},[t("code",[s._v("IoTDB"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("MERGE")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("ON")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("LOCAL")]),s._v("\nIoTDB"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("MERGE")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("ON")]),s._v(" CLUSTER\nIoTDB"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token 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CACHE")]),s._v(" "),t("p",[s._v("手动清除chunk, chunk metadata和timeseries metadata的缓存，在内存资源紧张时，可以通过此命令，释放查询时缓存所占的内存空间。在集群模式下，我们提供了清空单个节点缓存、清空整个集群缓存命令。")]),s._v(" "),t("div",{staticClass:"language-sql line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-sql"}},[t("code",[s._v("IoTDB"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v(" CLEAR CACHE\nIoTDB"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v(" CLEAR CACHE "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("ON")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("LOCAL")]),s._v("\nIoTDB"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v(" CLEAR CACHE "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("ON")]),s._v(" CLUSTER\n")])]),s._v(" 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"),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("TO")]),s._v(" WRITABLE\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br")])]),t("h2",{attrs:{id:"超时"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#超时"}},[s._v("#")]),s._v(" 超时")]),s._v(" "),t("p",[s._v("IoTDB 支持 Session 超时和查询超时。")]),s._v(" "),t("h3",{attrs:{id:"session-超时"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#session-超时"}},[s._v("#")]),s._v(" Session 超时")]),s._v(" "),t("p",[s._v("Session 超时控制何时关闭空闲 Session。空闲 Session 指在一段时间内没有发起任何操作的 Session。")]),s._v(" "),t("p",[s._v("Session 超时默认未开启。可以在配置文件中通过 "),t("code",[s._v("session_timeout_threshold")]),s._v(" 参数进行配置。")]),s._v(" "),t("h3",{attrs:{id:"查询超时"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#查询超时"}},[s._v("#")]),s._v(" 查询超时")]),s._v(" "),t("p",[s._v("对于执行时间过长的查询，IoTDB 将强行中断该查询，并抛出超时异常，如下所示：")]),s._v(" "),t("div",{staticClass:"language-sql line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-sql"}},[t("code",[s._v("IoTDB"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("select")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("*")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("from")]),s._v(" root"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("*")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("*")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(";")]),s._v("\nMsg: "),t("span",{pre:!0,attrs:{class:"token number"}},[s._v("701")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("Current")]),s._v(" query "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("is")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("time")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("out")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" please "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("check")]),s._v(" your statement "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("or")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("modify")]),s._v(" timeout parameter"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br")])]),t("p",[s._v("系统默认的超时时间为 60000 ms，可以在配置文件中通过 "),t("code",[s._v("query_timeout_threshold")]),s._v(" 参数进行自定义配置。")]),s._v(" "),t("p",[s._v("如果您使用 JDBC 或 Session，还支持对单个查询设置超时时间（单位为 ms）：")]),s._v(" "),t("div",{staticClass:"language-java 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line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-sql"}},[t("code",[t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("KILL")]),s._v(" QUERY "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("<")]),s._v("queryId"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v("\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br")])]),t("p",[s._v("通过指定 "),t("code",[s._v("queryId")]),s._v(" 可以中止指定的查询，而如果不指定 "),t("code",[s._v("queryId")]),s._v("，将中止所有正在执行的查询。")]),s._v(" "),t("p",[s._v("为了获取正在执行的查询 id，用户可以使用 "),t("code",[s._v("show query processlist")]),s._v(" 命令，该命令将显示所有正在执行的查询列表，结果形式如下：")]),s._v(" "),t("table",[t("thead",[t("tr",[t("th",[s._v("Time")]),s._v(" "),t("th",[s._v("queryId")]),s._v(" "),t("th",[s._v("statement")])])]),s._v(" "),t("tbody",[t("tr",[t("td"),s._v(" "),t("td"),s._v(" "),t("td")])])]),s._v(" "),t("p",[s._v("其中 statement 最大显示长度为 64 字符。对于超过 64 字符的查询语句，将截取部分进行显示。")]),s._v(" "),t("h2",{attrs:{id:"集群-region-分布监控工具"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#集群-region-分布监控工具"}},[s._v("#")]),s._v(" 集群 Region 分布监控工具")]),s._v(" "),t("p",[s._v("集群中以 Region 作为数据复制和数据管理的单元，Region 的状态和分布对于系统运维和测试有很大帮助，如以下场景：")]),s._v(" "),t("ul",[t("li",[s._v("查看集群中各个 Region 被分配到了哪些 DataNode，是否均衡")])]),s._v(" "),t("p",[s._v("当前 IoTDB 支持使用如下 SQL 查看 Region：")]),s._v(" "),t("ul",[t("li",[t("code",[s._v("SHOW REGIONS")]),s._v(": 展示所有 Region")]),s._v(" "),t("li",[t("code",[s._v("SHOW SCHEMA REGIONS")]),s._v(": 展示所有 SchemaRegion 分布")]),s._v(" "),t("li",[t("code",[s._v("SHOW DATA REGIONS")]),s._v(": 展示所有 DataRegion 分布")]),s._v(" "),t("li",[t("code",[s._v("SHOW (DATA|SCHEMA)? 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CONFIGNODES\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br")])]),t("p",[s._v("示例：")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("IoTDB> show confignodes\n+------+-------+-------+-----+\n|NodeID| Status|   Host| Port|\n+------+-------+-------+-----+\n|     0|Running|0.0.0.0|22277|\n|     1|Running|0.0.0.0|22279|\n|     2|Running|0.0.0.0|22281|\n+------+-------+-------+-----+\nTotal line number = 3\nIt costs 0.030s\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br"),t("span",{staticClass:"line-number"},[s._v("8")]),t("br"),t("span",{staticClass:"line-number"},[s._v("9")]),t("br"),t("span",{staticClass:"line-number"},[s._v("10")]),t("br")])]),t("p",[s._v("停止一个节点之后，节点的状态会发生改变，状态显示如下：")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("IoTDB> show confignodes\n+------+-------+-------+-----+\n|NodeID| Status|   Host| Port|\n+------+-------+-------+-----+\n|     0|Running|0.0.0.0|22277|\n|     1|Running|0.0.0.0|22279|\n|     2|Unknown|0.0.0.0|22281|\n+------+-------+-------+-----+\nTotal line number = 3\nIt costs 0.009s\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br"),t("span",{staticClass:"line-number"},[s._v("8")]),t("br"),t("span",{staticClass:"line-number"},[s._v("9")]),t("br"),t("span",{staticClass:"line-number"},[s._v("10")]),t("br")])]),t("h3",{attrs:{id:"查看全部节点信息"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#查看全部节点信息"}},[s._v("#")]),s._v(" 查看全部节点信息")]),s._v(" "),t("p",[s._v("当前 IoTDB 支持使用如下 SQL 查看全部节点的信息：")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("SHOW CLUSTER\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br")])]),t("p",[s._v("示例：")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("IoTDB> show cluster\n+------+----------+-------+---------+-----+\n|NodeID|  NodeType| Status|     Host| Port|\n+------+----------+-------+---------+-----+\n|     0|ConfigNode|Running|  0.0.0.0|22277|\n|     1|ConfigNode|Running|  0.0.0.0|22279|\n|     2|ConfigNode|Running|  0.0.0.0|22281|\n|     3|  DataNode|Running|127.0.0.1| 9003|\n|     4|  DataNode|Running|127.0.0.1| 9005|\n|     5|  DataNode|Running|127.0.0.1| 9007|\n+------+----------+-------+---------+-----+\nTotal line number = 6\nIt costs 0.011s\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br"),t("span",{staticClass:"line-number"},[s._v("8")]),t("br"),t("span",{staticClass:"line-number"},[s._v("9")]),t("br"),t("span",{staticClass:"line-number"},[s._v("10")]),t("br"),t("span",{staticClass:"line-number"},[s._v("11")]),t("br"),t("span",{staticClass:"line-number"},[s._v("12")]),t("br"),t("span",{staticClass:"line-number"},[s._v("13")]),t("br")])]),t("p",[s._v("停止一个节点之后，节点的状态会发生改变，状态显示如下：")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("IoTDB> show cluster\n+------+----------+-------+---------+-----+\n|NodeID|  NodeType| Status|     Host| Port|\n+------+----------+-------+---------+-----+\n|     0|ConfigNode|Running|  0.0.0.0|22277|\n|     1|ConfigNode|Unknown|  0.0.0.0|22279|\n|     2|ConfigNode|Running|  0.0.0.0|22281|\n|     3|  DataNode|Running|127.0.0.1| 9003|\n|     4|  DataNode|Running|127.0.0.1| 9005|\n|     5|  DataNode|Running|127.0.0.1| 9007|\n+------+----------+-------+---------+-----+\nTotal line number = 6\nIt costs 0.012s\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br"),t("span",{staticClass:"line-number"},[s._v("8")]),t("br"),t("span",{staticClass:"line-number"},[s._v("9")]),t("br"),t("span",{staticClass:"line-number"},[s._v("10")]),t("br"),t("span",{staticClass:"line-number"},[s._v("11")]),t("br"),t("span",{staticClass:"line-number"},[s._v("12")]),t("br"),t("span",{staticClass:"line-number"},[s._v("13")]),t("br")])])])}),[],!1,null,null,null);t.default=e.exports}}]);