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  1. MariaDB Server
  2. MDEV-31942

Online alter: support cascade foreign keys

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Details

    • Task
    • Status: Stalled (View Workflow)
    • Major
    • Resolution: Unresolved
    • N/A
    • None
    • None

    Description

      Currently, ALGORITHM=COPY, LOCK=NONE is disabled for tables with cascade foreign keys (including SET NULL/SET DEFAULT).

      The preliminary patch, 4b758fdc73, was done yet in scope of MDEV-29068 bugfix.

      As it was noted by Marko Mäkelä, the implementation would be unaffordably slow. Using table->vc_templ->mysql_table for a backward access to sql-layer table, as noted further, is broken by design. This should be fixed by MDEV-29181.

      Additionally, MDEV-30182 should provide an affordably fast (O(1)) FK-prelocked table lookup, which should be made per updated record.

      Attachments

        Issue Links

          blocks

          Task - A task that needs to be done. MDEV-10393 Foreign keys SET DEFAULT action

          • Major - Major loss of function.
          • Open

          New Feature - A new feature of the product, which has yet to be developed. MDEV-22880 Honor constraints on UPDATE CASCADE

          • Major - Major loss of function.
          • Open
          is blocked by

          Task - A task that needs to be done. MDEV-30182 Optimize open_tables to take O(N) time

          • Critical - Crashes, loss of data, severe memory leak.
          • Stalled
          relates to

          Task - A task that needs to be done. MDEV-16356 Allow ALGORITHM=NOCOPY for ADD CONSTRAINT

          • Major - Major loss of function.
          • Open

          New Feature - A new feature of the product, which has yet to be developed. MDEV-12302 Execute triggers for foreign key updates/deletes

          • Critical - Crashes, loss of data, severe memory leak.
          • Stalled

          New Feature - A new feature of the product, which has yet to be developed. MDEV-22361 Cross-engine foreign keys checking

          • Major - Major loss of function.
          • Open

          Bug - A problem which impairs or prevents the functions of the product. MDEV-34151 Userstat does not count rows updated via FK cascade

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

          New Feature - A new feature of the product, which has yet to be developed. MDEV-16329 Engine-independent online ALTER TABLE

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

          Activity

            People

              gkodinov Georgi Kodinov
              nikitamalyavin Nikita Malyavin
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