(window.webpackJsonp=window.webpackJsonp||[]).push([[407],{979:function(s,e,a){"use strict";a.r(e);var t=a(69),n=Object(t.a)({},(function(){var s=this,e=s.$createElement,a=s._self._c||e;return a("ContentSlotsDistributor",{attrs:{"slot-key":s.$parent.slotKey}},[a("h1",{attrs:{id:"常见问题"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#常见问题"}},[s._v("#")]),s._v(" 常见问题")]),s._v(" "),a("p",[a("strong",[s._v("如何查询我的 IoTDB 版本")])]),s._v(" "),a("p",[s._v("有几种方法可以识别您使用的 IoTDB 版本:")]),s._v(" "),a("ul",[a("li",[s._v("启动 IoTDB 的命令行界面:")])]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("> ./start-cli.sh -p 6667 -pw root -u root -h localhost\n _____       _________  ______   ______    \n|_   _|     |  _   _  ||_   _ `.|_   _ \\   \n  | |   .--.|_/ | | \\_|  | | `. \\ | |_) |  \n  | | / .'`\\ \\  | |      | |  | | |  __'.  \n _| |_| \\__. | _| |_    _| |_.' /_| |__) | \n|_____|'.__.' |_____|  |______.'|_______/  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文件夹会被存储在"),a("code",[s._v("IOTDB_HOME/logs")]),s._v("。您可以在"),a("code",[s._v("IOTDB_HOME/conf")]),s._v("目录下的"),a("code",[s._v("logback.xml")]),s._v("文件中修改日志的级别和日志的存储路径。")]),s._v(" "),a("p",[a("strong",[s._v("在哪里可以找到 IoTDB 的数据文件")])]),s._v(" "),a("p",[s._v("在默认的设置里，数据文件（包含 TsFile，metadata，WAL）被存储在"),a("code",[s._v("IOTDB_HOME/data")]),s._v("文件夹。")]),s._v(" "),a("p",[a("strong",[s._v("如何知道 IoTDB 中存储了多少时间序列")])]),s._v(" "),a("p",[s._v("使用 IoTDB 的命令行接口:")]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("IoTDB> show timeseries root\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br")])]),a("p",[s._v("在返回的结果里，会展示"),a("code",[s._v("Total timeseries number")]),s._v("，这个数据就是 IoTDB 中 timeseries 的数量。")]),s._v(" "),a("p",[s._v("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:")]),s._v(" "),a("div",{staticClass:"language- 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"),a("a",{attrs:{href:"https://github.com/apache/iotdb/tree/master/spark",target:"_blank",rel:"noopener noreferrer"}},[s._v("Spark"),a("OutboundLink")],1),s._v(" 和 "),a("a",{attrs:{href:"https://github.com/apache/iotdb/tree/master/grafana",target:"_blank",rel:"noopener noreferrer"}},[s._v("Grafana"),a("OutboundLink")],1),s._v(" 可视化工具.")]),s._v(" "),a("p",[a("strong",[s._v("IoTDB如何处理重复的数据点")])]),s._v(" "),a("p",[s._v("一个数据点是由一个完整的时间序列路径(例如:"),a("code",[s._v("root.vehicle.d0.s0")]),s._v(")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。")]),s._v(" "),a("p",[a("strong",[s._v("我如何知道具体的 timeseries 的类型")])]),s._v(" "),a("p",[s._v("在 IoTDB 的命令行接口中使用 SQL "),a("code",[s._v("SHOW TIMESERIES <timeseries path>")]),s._v(":")]),s._v(" "),a("p",[s._v("例如：如果您想知道所有 timeseries 的类型 <timeseries path> 应该为 "),a("code",[s._v("root")]),s._v("。上面的 SQL 应该修改为:")]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("IoTDB> show timeseries root\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br")])]),a("p",[s._v("如果您想查询一个指定的时间序列, 您可以修改 <timeseries path> 为时间序列的完整路径。比如:")]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("IoTDB> show timeseries root.fit.d1.s1\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br")])]),a("p",[s._v("您还可以在 timeseries 路径中使用通配符:")]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("IoTDB> show timeseries root.fit.d1.*\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br")])]),a("p",[a("strong",[s._v("如何更改IoTDB的客户端时间显示格式")])]),s._v(" "),a("p",[s._v("IoTDB 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