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Type:
Bug
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Resolution: Duplicate
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Priority:
Critical - P2
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None
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Affects Version/s: 3.2.8
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Component/s: Querying
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None
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ALL
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version 3.2.8 (wildTiger):
[dbshell]: db.collection.find({crt: {$lte: new Date(1467047134260), $gt: new Date(1466442334260) }}).maxTimeMS(15000).count()
[mongd log]:
2017-06-30T07:15:24.477+0000 I COMMAND [conn5609213] query: { crt: { $lte: new Date(1467047134260), $gt: new Date(1466442334260) } }, maxTimeMS: 15000.0, fields: {} } planSummary: *IXSCAN* { crt: 1, wh: 1 } keyUpdates:0 writeConflicts:0 exception: operation exceeded time limit code:50 numYields:7019 reslen:74 locks:{ Global: { acquireCount: { r: 14040 } }, Database: { acquireCount: { r: 7020 } }, Collection: { acquireCount: { r: 7020 } } } protocol:op_command *15201ms*
if change the '$gt' to '$gte', it then shows different:
[dbshell]: db.collection.find({crt: {$lte: new Date(1467047134260), $gte: new Date(1466442334260) }}).maxTimeMS(15000).count()
[mongd log]: 2017-06-30T07:14:41.683+0000 I COMMAND [conn5609213] count { count: "order", query: { crt: { $lte: new Date(1467047134260), $gte: new Date(1466442334260) } }, maxTimeMS: 15000.0, fields: {} } planSummary: *COUNT_SCAN* { crt: 1, wh: 1 } keyUpdates:0 writeConflicts:0 numYields:20357 reslen:47 locks:{ Global: { acquireCount: { r: 40716 } }, Database: { acquireCount: { r: 20358 } }, Collection: { acquireCount: { r: 20358 } } } protocol:op_command *1962ms*
I tested with all the combination of '$lt'/''$lte', 'gt'/'gte', only when '$lte' and '$gte' using together can make mongo use COUNT_SCAN queryplan, which is much much faster.
- duplicates
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- Closed
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