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Type:
Bug
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Resolution: Duplicate
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Priority:
Major - P3
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None
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Affects Version/s: None
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Component/s: Querying
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None
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ALL
Hi,
I have the following document structure
{
ReceivedDate: <Date>
toy:[
{maker:{ _id: <objectid>,...} },
maker:{ _id: <objectid>,...} }
]
}
I have added the compound index {toy.maker._id:1, ReceivedDate:1}.
I am running the
db.<coll>.count({toy.maker._id: 'blah',
'ReceivedDate': { $gte: ISODate('2015-11-16T00:00:00+0000'), $lte: ISODate('2015-11-16T23:59:59+0000') } }
when I look at the explain I see the following bounds for the date index scan - "(true, new Date(1447718399000)]". Due to this it is causing some objects to be retrieved into memory instead of just using the index. Is there a reason why the index ranges are not being used?
"executionStats" : {
"executionSuccess" : true,
"nReturned" : 1351,
"executionTimeMillis" : 313,
"totalKeysExamined" : 10396,
"totalDocsExamined" : 10396,
"executionStages" : {
"stage" : "FETCH",
"filter" : {
"ReceivedDate" : {
"$gte" : ISODate("2015-11-16T00:00:00Z")
}
},
"nReturned" : 1351,
"executionTimeMillisEstimate" : 300,
"works" : 10397,
"advanced" : 1351,
"needTime" : 9045,
"needFetch" : 0,
"saveState" : 82,
"restoreState" : 82,
"isEOF" : 1,
"invalidates" : 0,
"docsExamined" : 10396,
"alreadyHasObj" : 0,
"inputStage" : {
"stage" : "IXSCAN",
"nReturned" : 10396,
"executionTimeMillisEstimate" : 10,
"works" : 10397,
"advanced" : 10396,
"needTime" : 0,
"needFetch" : 0,
"saveState" : 82,
"restoreState" : 82,
"isEOF" : 1,
"invalidates" : 0,
"keyPattern" : {
"toy.maker._id" : 1,
"ReceivedDate" : 1
},
"indexName" : "toy.maker._id_1_ReceivedDate_1",
"isMultiKey" : true,
"direction" : "forward",
"indexBounds" : {
"Route.Vendor._id" : [
"[83.0, 83.0]"
],
"ReceivedDate" : [
"(true, new Date(1447718399000)]"
]
},
"keysExamined" : 10396,
"dupsTested" : 10396,
"dupsDropped" : 0,
"seenInvalidated" : 0,
"matchTested" : 0
}
},
"allPlansExecution" : [ ]
},
- duplicates
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- Closed
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- is related to
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SERVER-15086 Allow for efficient range queries over non-array fields in multikey indices
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- Closed
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