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  1. MariaDB Server
  2. MDEV-4704

PROCESSLIST - Query Rank execution order

Details

    • Task
    • Status: Open (View Workflow)
    • Minor
    • Resolution: Unresolved
    • None
    • None
    • None

    Description

      hi guys, based on MDEV-4672 / MDEV-4748
      could we see when a query will be executed?
      (i think in mdl.h this is called as wait-for graph? or maybe it's the "A pending metadata lock request."?)

      something like:
      show query order <query id>
      it will return:

      message query id
      waiting unlock table 1
      waiting alter table 2
      waiting xxxxxx 999999

      this is nice when we have a busy server and want know when a query will be executed (or not), and help DBA to kill it or not

      —
      we could put another column to see informations about a lock
      in MDEV-4619 we have a lock table in information schema, maybe this could be used here to link to that table, example:

      message locks query id
      waiting table lock 1,2,3,4,5 1234
      waiting lock tables 44 423
      waiting update 66 44

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          includes

          Task - A task that needs to be done. MDEV-4619 PLUGINS - Add LOCKS information at I_S (lock table / lock functions / lock events and others locks / get_lock function / mdl locks)

          • Blocker - Blocks development and/or testing work, production could not run.
          • Closed

          Task - A task that needs to be done. MDEV-4672 PROCESSLIST - add two columns about query type and tables

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Open
          relates to

          Task - A task that needs to be done. MDEV-4748 metadata_lock_info plugin

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Closed

          Task - A task that needs to be done. MDEV-6864 extend mdl_info plugin

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Open

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              Unassigned Unassigned
              rspadim roberto spadim
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