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  1. Core Server
  2. SERVER-24312

Mongo Query Taking Lot of Time Selecting Index

    • Type: Icon: Bug Bug
    • Resolution: Done
    • Priority: Icon: Major - P3 Major - P3
    • None
    • Affects Version/s: 3.0.4
    • Component/s: Querying
    • Labels:
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      There are two issues happening :
      First Issue : Query taking lot of time in deciding which index to use.
      Eg: If we run an query X , then it takes a lot of time (more than 5 minutes) )and on checking the log it was using a index Y.
      Now if I run the query X with index hint Y, it runs in couple of seconds.
      That means the time it was taking is not in query execution but before that. Very strange

      Second Issue : In some cases it is not selecting the right index also. If my query is on fields A,B,C and I have indexes A and A_B_C created, then it is choosing the index A instead if A_B_C

            david.storch@mongodb.com David Storch
            arpit@limeroad.com arpit wanchoo
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