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Type:
Bug
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Resolution: Duplicate
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Priority:
Minor - P4
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None
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Affects Version/s: 3.0.12
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Component/s: Querying
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None
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ALL
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On MongoDB 3.0 if limit(value) is specified and value > 101, the explain("allPlansExecution") will only work through 101 documents:
> db.testcol.explain("allPlansExecution").find({a: {$gte: 200}}).limit(500)
{
"queryPlanner" : {
"plannerVersion" : 1,
"namespace" : "test.testcol",
"indexFilterSet" : false,
"parsedQuery" : {
"a" : {
"$gte" : 200
}
},
"winningPlan" : {
"stage" : "LIMIT",
"limitAmount" : 0,
"inputStage" : {
"stage" : "FETCH",
"inputStage" : {
"stage" : "IXSCAN",
"keyPattern" : {
"a" : 1
},
"indexName" : "a_1",
"isMultiKey" : false,
"direction" : "forward",
"indexBounds" : {
"a" : [
"[200.0, inf.0]"
]
}
}
}
},
"rejectedPlans" : [ ]
},
"executionStats" : {
"executionSuccess" : true,
"nReturned" : 101,
"executionTimeMillis" : 0,
"totalKeysExamined" : 101,
"totalDocsExamined" : 101,
"executionStages" : {
"stage" : "LIMIT",
"nReturned" : 101,
"executionTimeMillisEstimate" : 0,
"works" : 102,
"advanced" : 101,
"needTime" : 0,
"needFetch" : 0,
"saveState" : 0,
"restoreState" : 0,
"isEOF" : 1,
"invalidates" : 0,
"limitAmount" : 0,
"inputStage" : {
"stage" : "FETCH",
"nReturned" : 101,
"executionTimeMillisEstimate" : 0,
"works" : 101,
"advanced" : 101,
"needTime" : 0,
"needFetch" : 0,
"saveState" : 0,
"restoreState" : 0,
"isEOF" : 0,
"invalidates" : 0,
"docsExamined" : 101,
"alreadyHasObj" : 0,
"inputStage" : {
"stage" : "IXSCAN",
"nReturned" : 101,
"executionTimeMillisEstimate" : 0,
"works" : 101,
"advanced" : 101,
"needTime" : 0,
"needFetch" : 0,
"saveState" : 0,
"restoreState" : 0,
"isEOF" : 0,
"invalidates" : 0,
"keyPattern" : {
"a" : 1
},
"indexName" : "a_1",
"isMultiKey" : false,
"direction" : "forward",
"indexBounds" : {
"a" : [
"[200.0, inf.0]"
]
},
"keysExamined" : 101,
"dupsTested" : 0,
"dupsDropped" : 0,
"seenInvalidated" : 0,
"matchTested" : 0
}
}
},
"allPlansExecution" : [ ]
},
"serverInfo" : {
"host" : "mubuntu",
"port" : 9088,
"version" : "3.0.9",
"gitVersion" : "20d60d3491908f1ae252fe452300de3978a040c7"
},
"ok" : 1
}
If batchSize(value) is specified, the limit(value) will take effect:
> db.testcol.explain("allPlansExecution").find({a: {$gte: 200}}).limit(500).batchSize(500)
{
"queryPlanner" : {
"plannerVersion" : 1,
"namespace" : "test.testcol",
"indexFilterSet" : false,
"parsedQuery" : {
"a" : {
"$gte" : 200
}
},
"winningPlan" : {
"stage" : "LIMIT",
"limitAmount" : 0,
"inputStage" : {
"stage" : "FETCH",
"inputStage" : {
"stage" : "IXSCAN",
"keyPattern" : {
"a" : 1
},
"indexName" : "a_1",
"isMultiKey" : false,
"direction" : "forward",
"indexBounds" : {
"a" : [
"[200.0, inf.0]"
]
}
}
}
},
"rejectedPlans" : [ ]
},
"executionStats" : {
"executionSuccess" : true,
"nReturned" : 500,
"executionTimeMillis" : 0,
"totalKeysExamined" : 500,
"totalDocsExamined" : 500,
"executionStages" : {
"stage" : "LIMIT",
"nReturned" : 500,
"executionTimeMillisEstimate" : 0,
"works" : 501,
"advanced" : 500,
"needTime" : 0,
"needFetch" : 0,
"saveState" : 3,
"restoreState" : 3,
"isEOF" : 1,
"invalidates" : 0,
"limitAmount" : 0,
"inputStage" : {
"stage" : "FETCH",
"nReturned" : 500,
"executionTimeMillisEstimate" : 0,
"works" : 500,
"advanced" : 500,
"needTime" : 0,
"needFetch" : 0,
"saveState" : 3,
"restoreState" : 3,
"isEOF" : 0,
"invalidates" : 0,
"docsExamined" : 500,
"alreadyHasObj" : 0,
"inputStage" : {
"stage" : "IXSCAN",
"nReturned" : 500,
"executionTimeMillisEstimate" : 0,
"works" : 500,
"advanced" : 500,
"needTime" : 0,
"needFetch" : 0,
"saveState" : 3,
"restoreState" : 3,
"isEOF" : 0,
"invalidates" : 0,
"keyPattern" : {
"a" : 1
},
"indexName" : "a_1",
"isMultiKey" : false,
"direction" : "forward",
"indexBounds" : {
"a" : [
"[200.0, inf.0]"
]
},
"keysExamined" : 500,
"dupsTested" : 0,
"dupsDropped" : 0,
"seenInvalidated" : 0,
"matchTested" : 0
}
}
},
"allPlansExecution" : [ ]
},
"serverInfo" : {
"host" : "mubuntu",
"port" : 9088,
"version" : "3.0.9",
"gitVersion" : "20d60d3491908f1ae252fe452300de3978a040c7"
},
"ok" : 1
}
Limit() works fine with explain("allPlansExecution") on 3.2.6.
- duplicates
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SERVER-17577 Allow the query system to make use of differentiating between batchSize and limit
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- Closed
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