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  1. Moodle
  2. MDL-34770

Quiz reporting does not scale to a large number of user enrolments

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    • Improvement
    • Resolution: Duplicate
    • Minor
    • None
    • 2.3.1
    • Quiz
    • None
    • MOODLE_23_STABLE

    Description

      get_users_by_capability() without any limits is used throughout the quiz reporting, in courses with many enrolments this results in the max_memory_limit being hit and very large queries being created because of the use on IN() statements filled with enrolled users id's.

      Replacing get_users_by_capability() with get_enrolled_sql() may be a better approach. In my own testing it performs much better, but there may be some corner cases I'm not aware of that mean that get_enrolled_sql may be appropriate.

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              timhunt Tim Hunt
              matt.clarkson Matt Clarkson
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                Created:
                Updated:
                Resolved:

                Clockify

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