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  1. MariaDB Server
  2. MDEV-11335

Changing delay_key_write option for MyISAM table should not copy rows

Details

    Description

      Currently, changing delay_key_write option for MyISAM table using ALTER TABLE statement copies all table rows to a temporary table during alteration. However, it is totally unnecessary. Changing this attribute should not copy rows.

      One can just create a table with the same structure and this option set and then copy/rename .frm file, but why to rely on workaround when this can be implemented by server itself?

      See https://bugs.mysql.com/bug.php?id=45492 upstream MySQL bug also.

      Attachments

        Issue Links

          relates to

          Task - A task that needs to be done. MDEV-12836 Avoid table rebuild when removing of auto_increment settings

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

          Bug - A problem which impairs or prevents the functions of the product. MDEV-13636 ALTER TABLE ... DELAY_KEY_WRITE=1 creates table copy for MyISAM table with DATA DIRECTORY/INDEX DIRECTORY options

          • Major - Major loss of function.
          • Closed
          links to

          Web Link Bug #45492 changing delay_key_write option should not copy rows

          Activity

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            valerii Valerii Kravchuk created issue -
            valerii Valerii Kravchuk made changes -
            Field Original Value New Value
            Labels MyISAM upstream
            serg Sergei Golubchik made changes -
            Fix Version/s 10.1 [ 16100 ]
            serg Sergei Golubchik made changes -
            Affects Version/s 5.5 [ 15800 ]
            Affects Version/s 10.0 [ 16000 ]
            Affects Version/s 10.1 [ 16100 ]
            serg Sergei Golubchik made changes -
            Assignee Sergei Golubchik [ serg ]
            serg Sergei Golubchik added a comment -

            This is a bit tricky. delay_key_write option is stored in the MYI file and MyISAM does not support rewriting MYI header only, it has to recreate the whole MYI file.

            serg Sergei Golubchik added a comment - This is a bit tricky. delay_key_write option is stored in the MYI file and MyISAM does not support rewriting MYI header only, it has to recreate the whole MYI file.
            serg Sergei Golubchik made changes -
            serg Sergei Golubchik made changes -
            serg Sergei Golubchik made changes -
            Status Open [ 1 ] In Progress [ 3 ]
            serg Sergei Golubchik made changes -
            Status In Progress [ 3 ] Stalled [ 10000 ]
            serg Sergei Golubchik made changes -
            Fix Version/s 10.1.24 [ 22541 ]
            Fix Version/s 10.2.7 [ 22543 ]
            Fix Version/s 10.1 [ 16100 ]
            Resolution Fixed [ 1 ]
            Status Stalled [ 10000 ] Closed [ 6 ]
            serg Sergei Golubchik made changes -
            serg Sergei Golubchik made changes -
            Workflow MariaDB v3 [ 78425 ] MariaDB v4 [ 151252 ]
            mariadb-jira-automation Jira Automation (IT) made changes -
            Zendesk Related Tickets 182220

            People

              serg Sergei Golubchik
              valerii Valerii Kravchuk
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              Dates

                Created:
                Updated:
                Resolved:

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