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  1. Moodle
  2. MDL-61435

Improve performance of get_tags_by_area_in_contexts SQL query

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Details

    • Improvement
    • Resolution: Fixed
    • Minor
    • 3.5
    • 3.5
    • Tags

    Description

      Tim noticed while reviewing MDL-61135 that the query for get_tags_by_area_in_contexts will not be very performant.

      It can easily be re-written to perform better.

      Andrew suggested something along the lines of:

      select distinct t.* from mdl_tag t inner join mdl_tag_instance ti on t.id = ti.tagid where component = 'abc' and itemtype = 'def' and contextid in (1,2,3,4,5);
      

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              lameze Simey Lameze
              ryanwyllie Ryan Wyllie
              Mark Nelson Mark Nelson
              Andrew Lyons Andrew Lyons
              CiBoT CiBoT
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