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  1. Moodle
  2. MDL-52251

Gradebook history report performance issue on MySQL

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Duplicate
    • Affects Version/s: 2.8.9, 2.9.3, 3.0
    • Fix Version/s: None
    • Component/s: Gradebook
    • Labels:

      Description

      We've recently noticed this query in our slow logs running for hours. Our grade_grades_history table has over 9m records and this course in particular contributes 65k of them. The performance issues are because of nested sub-queries in the main query found in get_sql_and_params function in the tablelog.php class.

      We've modified the query to run under 4 minutes, not ideal but significantly better considering our scenario.

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