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  1. MariaDB Server
  2. MDEV-31942

Online alter: support cascade foreign keys

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Details

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

          is blocked by

          Bug - A problem which impairs or prevents the functions of the product. MDEV-29181 Potential corruption on Foreign key update on a table with vcol index

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

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

          • Major - Major loss of function.
          • Open
          split from

          Task - A task that needs to be done. MDEV-16329 Engine-independent online ALTER TABLE

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

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              nikitamalyavin Nikita Malyavin
              nikitamalyavin Nikita Malyavin
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              Dates

                Created:
                Updated:

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