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  1. MariaDB Server
  2. MDEV-11335

Changing delay_key_write option for MyISAM table should not copy rows

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    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.

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          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

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              serg Sergei Golubchik
              valerii Valerii Kravchuk
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                Resolved:

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