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  1. Core Server
  2. SERVER-2235

IndexScan should track the number of calls to seek() and expose in explain

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    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 3.3.2
    • Component/s: Querying
    • Backwards Compatibility:
      Fully Compatible
    • Sprint:
      Query 10 (02/22/16)

      Description

      The index scan stage should track the number of calls to BtreeIndexCursor::skip() made here:

      https://github.com/mongodb/mongo/blob/r3.0.0-rc6/src/mongo/db/exec/index_scan.cpp#L438-L439

      Original Description

      Currently nscanned isn't precise enough to distinguish between unindexed traversal and btree traversal, and in some cases between btree skipping and inorder order btree traversal.

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          is documented by

          Task - A task that needs to be done. DOCS-7086 Consider documenting "seeks" IXSCAN statistic added to explain

          • Major - P3 - Major loss of function.
          • Resolved
          is related to

          Improvement - An improvement or enhancement to an existing feature or task. SERVER-3414 consider using nscannedObjects in addition to nscanned when selecting a query plan

          • Minor - P4 - Minor loss of function, or other problem where easy workaround is present.
          • Closed
          related to

          Improvement - An improvement or enhancement to an existing feature or task. SERVER-10448 Revamp explain() formatting

          • Major - P3 - Major loss of function.
          • Closed

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                • Created:
                  Updated:
                  Resolved: