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root.stats.file_size.INFO")])])])]),t._v(" "),a("ul",[a("li",[t._v("SCHEMA")])]),t._v(" "),a("table",[a("thead",[a("tr",[a("th",{staticStyle:{"text-align":"center"}},[t._v("Name")]),t._v(" "),a("th",{staticStyle:{"text-align":"left"}},[t._v("SCHEMA")])])]),t._v(" "),a("tbody",[a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("描述")]),t._v(" "),a("td",{staticStyle:{"text-align":"left"}},[t._v("计算所有"),a("code",[t._v("metadata file")]),t._v("大小（在"),a("code",[t._v("data/system/metadata")]),t._v("下）的总和（以字节为单位）")])]),t._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("类型")]),t._v(" "),a("td",{staticStyle:{"text-align":"left"}},[t._v("File size statistics")])]),t._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("时间序列名称")]),t._v(" "),a("td",{staticStyle:{"text-align":"left"}},[t._v("root.stats.file_size.SCHEMA")])]),t._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("重新启动系统后重设")]),t._v(" "),a("td",{staticStyle:{"text-align":"left"}},[t._v("No")])]),t._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("例子")]),t._v(" "),a("td",{staticStyle:{"text-align":"left"}},[t._v("select SCHEMA from root.stats.file_size.SCHEMA")])])])]),t._v(" "),a("h2",{attrs:{id:"性能监控"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#性能监控"}},[t._v("#")]),t._v(" 性能监控")]),t._v(" "),a("h3",{attrs:{id:"介绍"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#介绍"}},[t._v("#")]),t._v(" 介绍")]),t._v(" "),a("p",[t._v("性能监控模块用来监控IOTDB每一个操作的耗时，以便用户更好的了解数据库的整体性能。此模块会统计每一种操作的平均耗时，以及耗时在一定时间区间内（1ms，4ms，16ms，64ms，256ms，1024ms，以上）的操作的比例。输出文件在log_measure.log中。输出样例如下：")]),t._v(" "),a("img",{staticStyle:{width:"100%","max-width":"800px","max-height":"600px","margin-left":"auto","margin-right":"auto",display:"block"},attrs:{src:"https://user-images.githubusercontent.com/13203019/60937461-14296f80-a303-11e9-9602-a7bed624bfb3.png"}}),t._v(" "),a("h3",{attrs:{id:"配置参数"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#配置参数"}},[t._v("#")]),t._v(" 配置参数")]),t._v(" "),a("p",[t._v("配置文件位置：conf/iotdb-engine.properties")]),t._v(" "),a("center",[t._v("**表 -配置参数以及描述项**\n"),a("table",[a("thead",[a("tr",[a("th",{staticStyle:{"text-align":"left"}},[t._v("参数")]),t._v(" "),a("th",{staticStyle:{"text-align":"left"}},[t._v("默认值")]),t._v(" "),a("th",{staticStyle:{"text-align":"left"}},[t._v("描述")])])]),t._v(" "),a("tbody",[a("tr",[a("td",{staticStyle:{"text-align":"left"}},[t._v("enable_performance_stat")]),t._v(" "),a("td",{staticStyle:{"text-align":"left"}},[t._v("false")]),t._v(" "),a("td",{staticStyle:{"text-align":"left"}},[t._v("是否开启性能监控模块")])]),t._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"left"}},[t._v("performance_stat_display_interval")]),t._v(" "),a("td",{staticStyle:{"text-align":"left"}},[t._v("60000")]),t._v(" "),a("td",{staticStyle:{"text-align":"left"}},[t._v("打印统计结果的时间延迟，以毫秒为单位")])]),t._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"left"}},[t._v("performance_stat_memory_in_kb")]),t._v(" "),a("td",{staticStyle:{"text-align":"left"}},[t._v("20")]),t._v(" "),a("td",{staticStyle:{"text-align":"left"}},[t._v("性能监控模块使用的内存阈值，单位为KB")])])])])]),t._v(" "),a("h3",{attrs:{id:"利用jmx-mbean动态调节参数"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#利用jmx-mbean动态调节参数"}},[t._v("#")]),t._v(" 利用JMX MBean动态调节参数")]),t._v(" "),a("p",[t._v("通过端口31999连接jconsole，并在上方菜单项中选择‘MBean’. 展开侧边框并选择 'org.apache.iotdb.db.cost.statistic'. 将会得到如下图所示结果：")]),t._v(" "),a("img",{staticStyle:{width:"100%","max-width":"800px","max-height":"600px","margin-left":"auto","margin-right":"auto",display:"block"},attrs:{src:"https://user-images.githubusercontent.com/13203019/60937484-30c5a780-a303-11e9-8e92-04c413df2088.png"}}),t._v(" "),a("p",[a("strong",[t._v("属性")])]),t._v(" "),a("ol",[a("li",[t._v("EnableStat：是否开启性能监控模块，如果被设置为true，则性能监控模块会记录每个操作的耗时并打印结果。这个参数不能直接通过jconsole直接更改，但可通过下方的函数来进行动态设置。")]),t._v(" "),a("li",[t._v("DisplayIntervalInMs：相邻两次打印结果的时间间隔。这个参数可以直接设置，但它要等性能监控模块重启才会生效。重启性能监控模块可以通过先调用 stopStatistic()然后调用startContinuousStatistics()或者直接调用 startOneTimeStatistics()实现。")]),t._v(" "),a("li",[t._v("OperationSwitch：这个属性用来展示针对每一种操作是否开启了监控统计，map的键为操作的名字，值为是否针对这种操作开启性能监控。这个参数不能直接通过jconsole直接更改，但可通过下方的 'changeOperationSwitch()'函数来进行动态设置。")])]),t._v(" "),a("p",[a("strong",[t._v("操作")])]),t._v(" "),a("ol",[a("li",[t._v("startContinuousStatistics：开启性能监控并以‘DisplayIntervalInMs’的时间间隔打印统计结果。")]),t._v(" "),a("li",[t._v("startOneTimeStatistics：开启性能监控并以‘DisplayIntervalInMs’的时间延迟打印一次统计结果。")]),t._v(" "),a("li",[t._v("stopStatistic：关闭性能监控。")]),t._v(" "),a("li",[t._v("clearStatisticalState(): 清除以统计的结果，从新开始统计。")]),t._v(" "),a("li",[t._v("changeOperationSwitch(String operationName, Boolean operationState):设置是否针对每一种不同的操作开启监控。参数‘operationName是操作的名称，在OperationSwitch属性中展示了所有操作的名称。参数 ‘operationState’是操作的状态，打开或者关闭。如果状态设置成功则此函数会返回true，否则返回false。")])]),t._v(" "),a("h3",{attrs:{id:"自定义操作类型监控其他区域"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#自定义操作类型监控其他区域"}},[t._v("#")]),t._v(" 自定义操作类型监控其他区域")]),t._v(" "),a("p",[a("strong",[t._v("增加操作项")])]),t._v(" "),a("p",[t._v("在org.apache.iotdb.db.cost.statistic.Operation类中增加一个枚举项来表示新增的操作.")]),t._v(" "),a("p",[a("strong",[t._v("在监控区域增加监控代码")])]),t._v(" "),a("p",[t._v("在监控开始区域增加计时代码:")]),t._v(" "),a("div",{staticClass:"language- extra-class"},[a("pre",[a("code",[t._v("long t0 = System. currentTimeMillis();\n")])])]),a("p",[t._v("在监控结束区域增加记录代码:")]),t._v(" "),a("div",{staticClass:"language- extra-class"},[a("pre",[a("code",[t._v("Measurement.INSTANCE.addOperationLatency(Operation, t0);\n")])])]),a("h2",{attrs:{id:"cache命中率统计"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#cache命中率统计"}},[t._v("#")]),t._v(" cache命中率统计")]),t._v(" "),a("h3",{attrs:{id:"概述"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#概述"}},[t._v("#")]),t._v(" 概述")]),t._v(" "),a("p",[t._v("为了提高查询性能，IOTDB对ChunkMetaData和TsFileMetaData进行了缓存。用户可以通过debug级别的日志以及MXBean两种方式来查看缓存的命中率，并根据缓存命中率以及系统内存来调节缓存所使用的内存大小。使用MXBean查看缓存命中率的方法为：")]),t._v(" "),a("ol",[a("li",[t._v("通过端口31999连接jconsole，并在上方菜单项中选择‘MBean’.")]),t._v(" "),a("li",[t._v("展开侧边框并选择 'org.apache.iotdb.db.service'. 将会得到如下图所示结果：")])]),t._v(" "),a("img",{staticStyle:{width:"100%","max-width":"800px","max-height":"600px","margin-left":"auto","margin-right":"auto",display:"block"},attrs:{src:"https://user-images.githubusercontent.com/13203019/65687623-404fc380-e09c-11e9-83c3-3c7c63a5b0be.jpeg"}}),t._v("\n## 系统日志\n"),a("p",[t._v("IoTDB支持用户通过修改日志配置文件的方式对IoTDB系统日志（如日志输出级别等）进行配置，系统日志配置文件默认位置在$IOTDB_HOME/conf文件夹下，默认的日志配置文件名为logback.xml。用户可以通过增加或更改其中的xml树型节点参数对系统运行日志的相关配置进行修改。详细配置说明参看本文日志文件配置说明。")]),t._v(" "),a("p",[t._v("同时，为了方便在系统运行过程中运维人员对系统的调试，我们为系统运维人员提供了动态修改日志配置的JMX接口，能够在系统不重启的前提下实时对系统的Log模块进行配置。详细使用方法参看动态系统日志配置说明)。")]),t._v(" "),a("h3",{attrs:{id:"动态系统日志配置说明"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#动态系统日志配置说明"}},[t._v("#")]),t._v(" 动态系统日志配置说明")]),t._v(" "),a("h4",{attrs:{id:"连接jmx"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#连接jmx"}},[t._v("#")]),t._v(" 连接JMX")]),t._v(" "),a("p",[t._v("本节以Jconsole为例介绍连接JMX并进入动态系统日志配置模块的方法。启动Jconsole控制页面，在新建连接处建立与IoTDB Server的JMX连接（可以选择本地进程或给定IoTDB的IP及PORT进行远程连接，IoTDB的JMX服务默认运行端口为31999），如下图使用远程进程连接Localhost下运行在31999端口的IoTDB JMX服务。")]),t._v(" "),a("img",{staticStyle:{width:"100%","max-width":"800px","max-height":"600px","margin-left":"auto","margin-right":"auto",display:"block"},attrs:{src:"https://user-images.githubusercontent.com/13203019/51577195-f94d7500-1ef3-11e9-999a-b4f67055d80e.png"}}),t._v(" "),a("p",[t._v("连接到JMX后，您可以通过MBean选项卡找到名为"),a("code",[t._v("ch.qos.logback.classic")]),t._v("的"),a("code",[t._v("MBean")]),t._v("，如下图所示。")]),t._v(" "),a("img",{staticStyle:{width:"100%","max-width":"800px","max-height":"600px","margin-left":"auto","margin-right":"auto",display:"block"},attrs:{src:"https://user-images.githubusercontent.com/13203019/51577204-fe122900-1ef3-11e9-9e89-2eb1d46e24b8.png"}}),t._v(" "),a("p",[t._v("在"),a("code",[t._v("ch.qos.logback.classic")]),t._v("的MBean操作（Operations）选项中，可以看到当前动态系统日志配置支持的5种接口，您可以通过使用相应的方法，来执行相应的操作，操作页面如图。")]),t._v(" "),a("img",{staticStyle:{width:"100%","max-width":"800px","max-height":"600px","margin-left":"auto","margin-right":"auto",display:"block"},attrs:{src:"https://user-images.githubusercontent.com/13203019/51577216-09fdeb00-1ef4-11e9-9005-542ad7d9e9e0.png"}}),t._v(" "),a("h4",{attrs:{id:"动态系统日志接口说明"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#动态系统日志接口说明"}},[t._v("#")]),t._v(" 动态系统日志接口说明")]),t._v(" "),a("ul",[a("li",[t._v("reloadDefaultConfiguration接口")])]),t._v(" "),a("p",[t._v("该方法为重新加载默认的logback配置文件，用户可以先对默认的配置文件进行修改，然后调用该方法将修改后的配置文件重新加载到系统中，使其生效。")]),t._v(" "),a("ul",[a("li",[t._v("reloadByFileName接口")])]),t._v(" "),a("p",[t._v("该方法为加载一个指定路径的logback配置文件，并使其生效。该方法接受一个名为p1的String类型的参数，该参数为需要指定加载的配置文件路径。")]),t._v(" "),a("ul",[a("li",[t._v("getLoggerEffectiveLevel接口")])]),t._v(" "),a("p",[t._v("该方法为获取指定Logger当前生效的日志级别。该方法接受一个名为p1的String类型的参数，该参数为指定Logger的名称。该方法返回指定Logger当前生效的日志级别。")]),t._v(" "),a("ul",[a("li",[t._v("getLoggerLevel接口")])]),t._v(" "),a("p",[t._v("该方法为获取指定Logger的日志级别。该方法接受一个名为p1的String类型的参数，该参数为指定Logger的名称。该方法返回指定Logger的日志级别。")]),t._v(" "),a("p",[t._v("需要注意的是，该方法与"),a("code",[t._v("getLoggerEffectiveLevel")]),t._v("方法的区别在于，该方法返回的是指定Logger在配置文件中被设定的日志级别，如果用户没有对该Logger进行日志级别的设定，则返回空。按照Logback的日志级别继承机制，如果一个Logger没有被显示地设定日志级别，其将会从其最近的祖先继承日志级别的设定。这时，调用"),a("code",[t._v("getLoggerEffectiveLevel")]),t._v("方法将返回该Logger生效的日志级别；而调用本节所述方法，将返回空。")])],1)}),[],!1,null,null,null);e.default=_.exports}}]);