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  1. Sakai
  2. SAK-39118

getUsersIsAllowed in a large sites can result in terrible MySQL query performance

    Details

    • 11 status:
      Resolved
    • 10 status:
      Please Merge
    • Previous Issue Keys:
      KNL-1475

      Description

      Site has two sections and 150+ groups. Using MySQL 5.6. The query observed returns 152 results.

      The old getSelectRealmRoleGroupUserIdSql seems to use a sub-query for no apparent reason.

      Attaching screenshots showing query performance with two separate MySQL 5.6 instances.

        Gliffy Diagrams

          Zeplin

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            1. mysql-block-nested-loop.PNG
              21 kB
              Sam Ottenhoff
            2. mysql-temp-table.PNG
              21 kB
              Sam Ottenhoff

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                Assignee:
                ottenhoff Sam Ottenhoff
                Reporter:
                ottenhoff Sam Ottenhoff
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