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  1. Core Server
  2. SERVER-6095

make multikey indices useful for sharding

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    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Minor - P4
    • Resolution: Duplicate
    • Affects Version/s: 2.1.2
    • Fix Version/s: None
    • Component/s: Indexing, Sharding
    • Labels:
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      Description

      If sharding on "a", an index on "a,b" is not considered useful if there are multikey (array) values for "b". Theoretically, it should still be useful (though maybe less efficient than single-key indices), so we should be able to use it if no single-key index that start with "a" exists.

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