(window.webpackJsonp=window.webpackJsonp||[]).push([[455],{1021:function(s,e,a){"use strict";a.r(e);var t=a(70),r=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("h2",{attrs:{id:"概览"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#概览"}},[s._v("#")]),s._v(" 概览")]),s._v(" "),a("ul",[a("li",[s._v("常见问题\n"),a("ul",[a("li",[s._v("如何查询我的 IoTDB 版本？")]),s._v(" "),a("li",[s._v("在哪里可以找到 IoTDB 的日志？")]),s._v(" "),a("li",[s._v("在哪里可以找到 IoTDB 的数据文件？")]),s._v(" "),a("li",[s._v("如何知道 IoTDB 中存储了多少时间序列？")]),s._v(" "),a("li",[s._v("可以使用 Hadoop 和 Spark 读取 IoTDB 中的 TsFile 吗？")]),s._v(" "),a("li",[s._v("IoTDB 如何处理重复的数据点？")]),s._v(" "),a("li",[s._v("我如何知道具体的 timeseries 的类型？")]),s._v(" "),a("li",[s._v("如何更改 IoTDB 的客户端时间显示格式？")])])])]),s._v(" 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"),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br"),a("span",{staticClass:"line-number"},[s._v("4")]),a("br"),a("span",{staticClass:"line-number"},[s._v("5")]),a("br"),a("span",{staticClass:"line-number"},[s._v("6")]),a("br"),a("span",{staticClass:"line-number"},[s._v("7")]),a("br")])]),a("ul",[a("li",[s._v("检查 pom.xml 文件:")])]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("<version>x.x.x</version>\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br")])]),a("ul",[a("li",[s._v("使用 JDBC API:")])]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("String iotdbVersion = tsfileDatabaseMetadata.getDatabaseProductVersion();\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br")])]),a("ul",[a("li",[s._v("使用命令行接口:")])]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("IoTDB> show version\nshow version\n+---------------+\n|version        |\n+---------------+\n|x.x.x          |\n+---------------+\nTotal line number = 1\nIt costs 0.241s\n")])]),s._v(" 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"),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br"),a("span",{staticClass:"line-number"},[s._v("4")]),a("br"),a("span",{staticClass:"line-number"},[s._v("5")]),a("br"),a("span",{staticClass:"line-number"},[s._v("6")]),a("br"),a("span",{staticClass:"line-number"},[s._v("7")]),a("br"),a("span",{staticClass:"line-number"},[s._v("8")]),a("br"),a("span",{staticClass:"line-number"},[s._v("9")]),a("br")])]),a("p",[s._v("假如 "),a("code",[s._v("$IOTDB_HOME = /workspace/incubator-iotdb/server/target/iotdb-server-{project.version}")])]),s._v(" "),a("p",[s._v("假如 "),a("code",[s._v("$IOTDB_CLI_HOME = /workspace/incubator-iotdb/cli/target/iotdb-cli-{project.version}")])]),s._v(" "),a("p",[s._v("在默认的设置里，logs 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("h2",{attrs:{id:"在哪里可以找到-iotdb-的数据文件"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#在哪里可以找到-iotdb-的数据文件"}},[s._v("#")]),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("h2",{attrs:{id:"如何知道-iotdb-中存储了多少时间序列"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#如何知道-iotdb-中存储了多少时间序列"}},[s._v("#")]),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- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("IoTDB> count 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("如果您使用的是 Linux 操作系统，您可以使用以下的 Shell 命令:")]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v('> grep "0,root" $IOTDB_HOME/data/system/schema/mlog.txt |  wc -l\n>   6\n')])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br")])]),a("h2",{attrs:{id:"可以使用-hadoop-和-spark-读取-iotdb-中的-tsfile-吗"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#可以使用-hadoop-和-spark-读取-iotdb-中的-tsfile-吗"}},[s._v("#")]),s._v(" 可以使用 Hadoop 和 Spark 读取 IoTDB 中的 TsFile 吗？")]),s._v(" "),a("p",[s._v("是的。IoTDB 与开源生态紧密结合。IoTDB 支持 "),a("a",{attrs:{href:"https://github.com/apache/incubator-iotdb/tree/master/hadoop",target:"_blank",rel:"noopener noreferrer"}},[s._v("Hadoop"),a("OutboundLink")],1),s._v(", "),a("a",{attrs:{href:"https://github.com/apache/incubator-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/incubator-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("h2",{attrs:{id:"iotdb如何处理重复的数据点"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#iotdb如何处理重复的数据点"}},[s._v("#")]),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("h2",{attrs:{id:"我如何知道具体的-timeseries-的类型"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#我如何知道具体的-timeseries-的类型"}},[s._v("#")]),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("h2",{attrs:{id:"如何更改iotdb的客户端时间显示格式"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#如何更改iotdb的客户端时间显示格式"}},[s._v("#")]),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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