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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: 2.2.2
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Component/s: Querying
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None
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ALL
Lets say you are querying for { a:{ $gt:10, $lt:20 } }
and you have an index on a, b
If b is multikey, the query optimizer will scan a much wider range of index and it will have to scan the objects to complete query evaluation. This is because the optimizer doesn't know if all the values of a are scalar; if they are not a document like { _id:2, { a:[ 5, 25 ] } } would match the query.
This makes the advice that an index on a is not needed if you have an index on a, b incorrect and makes performance optimization confusing.
- duplicates
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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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- is duplicated by
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- Closed
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- is related to
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- Closed
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- Closed
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- related to
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- Closed
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