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  1. Core Server
  2. SERVER-29292

Track history of query plan changes in mongod

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    Details

    • Type: Improvement
    • Status: Open
    • Priority: Major - P3
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: Backlog
    • Component/s: Diagnostics, Querying
    • Labels:
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      Description

      We would like to have a data source for historical query plans and plan changes.

      Recording the time a new query shape appeared, or the time an existing shape acquired a new plan, would be very helpful in diagnosing sudden shifts in database behaviour (e.g., the ability to state unequivocally that a new query shape first appeared just before a performance disruption).

      recording new plans in the mongod log may be adequate. Maintaining an in-memory collection summarizing these and including other useful statistics like execution counts, average latency, average time waiting on locks, etc., would be even more useful.

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              • Created:
                Updated: