mongodb 3.0+ 查询性能分析
{"queryPlanner" : {
"plannerVersion" : 1,
"namespace" : "personmap.person",
"indexFilterSet" : false,
"parsedQuery" : {
"age" : {
"$lte" : 2000.0
}
},
"winningPlan" : {
"stage" : "FETCH",
"inputStage" : {
"stage" : "IXSCAN",
"keyPattern" : {
"age" : 1.0
},
"indexName" : "age_1",
"isMultiKey" : false,
"direction" : "forward",
"indexBounds" : {
"age" : [
"[-1.#INF, 2000.0]"
]
}
}
},
"rejectedPlans" : []
},
"executionStats" : {
"executionSuccess" : true,
"nReturned" : 2001,
"executionTimeMillis" : 143,
"totalKeysExamined" : 2001,
"totalDocsExamined" : 2001,
"executionStages" : {
"stage" : "FETCH",
"nReturned" : 2001,
"executionTimeMillisEstimate" : 0,
"works" : 2002,
"advanced" : 2001,
"needTime" : 0,
"needFetch" : 0,
"saveState" : 16,
"restoreState" : 16,
"isEOF" : 1,
"invalidates" : 0,
"docsExamined" : 2001,
"alreadyHasObj" : 0,
"inputStage" : {
"stage" : "IXSCAN",
"nReturned" : 2001,
"executionTimeMillisEstimate" : 0,
"works" : 2002,
"advanced" : 2001,
"needTime" : 0,
"needFetch" : 0,
"saveState" : 16,
"restoreState" : 16,
"isEOF" : 1,
"invalidates" : 0,
"keyPattern" : {
"age" : 1.0
},
"indexName" : "age_1",
"isMultiKey" : false,
"direction" : "forward",
"indexBounds" : {
"age" : [
"[-1.#INF, 2000.0]"
]
},
"keysExamined" : 2001,
"dupsTested" : 0,
"dupsDropped" : 0,
"seenInvalidated" : 0,
"matchTested" : 0
}
}
},
"serverInfo" : {
"host" : "qinxiongzhou",
"port" : 27017,
"version" : "3.0.7",
"gitVersion" : "6ce7cbe8c6b899552dadd907604559806aa2e9bd"
},
"ok" : 1.0
}
db.getCollection('person').find({"age":{"$lte":2000}}).explain("executionStats")
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