mongodb Explain and Index-WorkNote
{"queryPlanner" : {
"plannerVersion" : 1,
"namespace" : "test.person", 返回所查询的表
"indexFilterSet" : false, 针对该query是否有indexfilter
"parsedQuery" : {
"age" : {
"$lte" : 2001
}
},
"winningPlan" : { 查询优化器针对该query所返回的最优执行计划的详细内容
"stage" : "FETCH",
"inputStage" : {
"stage" : "IXSCAN",
"keyPattern" : {
"age" : 1
},
"indexName" : "age_1",
"isMultiKey" : false,
"isUnique" : false,
"isSparse" : false,
"isPartial" : false,
"indexVersion" : 1,
"direction" : "forward",
"indexBounds" : {
"age" : [
"[-inf.0, 2001.0]"
]
}
}
},
"rejectedPlans" : [ ]
},
"executionStats" : {
"executionSuccess" : true,
"nReturned" : 2002, 表示本次查询返回的条目数
"executionTimeMillis" : 28, 表示本次query整体查询的时间
"totalKeysExamined" : 2002, 表示索引扫描的条目数
"totalDocsExamined" : 2002, 表示文档扫描的条目数
"executionStages" : {
"stage" : "FETCH",
"nReturned" : 2002,
"executionTimeMillisEstimate" : 10, 表示本次查询根据index检索document获得结果数据的时间
"works" : 2003,
"advanced" : 2002,
"needTime" : 0,
"needYield" : 0,
"saveState" : 15,
"restoreState" : 15,
"isEOF" : 1,
"invalidates" : 0,
"docsExamined" : 2002,
"alreadyHasObj" : 0,
"inputStage" : {
"stage" : "IXSCAN",
"nReturned" : 2002,
"executionTimeMillisEstimate" : 0, 表示该查询扫描2002行index所用的时间
"works" : 2003,
"advanced" : 2002,
"needTime" : 0,
"needYield" : 0,
"saveState" : 15,
"restoreState" : 15,
"isEOF" : 1,
"invalidates" : 0,
"keyPattern" : {
"age" : 1
},
"indexName" : "age_1",
"isMultiKey" : false,
"isUnique" : false,
"isSparse" : false,
"isPartial" : false,
"indexVersion" : 1,
"direction" : "forward",
"indexBounds" : {
"age" : [
"[-inf.0, 2001.0]"
]
},
"keysExamined" : 2002,
"dupsTested" : 0,
"dupsDropped" : 0,
"seenInvalidated" : 0
}
}
},
"serverInfo" : {
"host" : "meteor.yeecall.com",
"port" : 27027,
"version" : "3.2.8",
"gitVersion" : "ed70e33130c977bda0024c125b56d159573dbaf0"
},
"ok" : 1
}
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