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  1. MariaDB Server
  2. MDEV-28942

Online alter does not support ORDER BY

Details

    Description

      create table t (f int);
      		 
      alter online table t order by f;
      		 
       
      		 
      # Cleanup
      		 
      drop table t;

      bb-10.10-MDEV-16329 cb1f08bd

      		 
      mysqltest: At line 2: query 'alter online table t order by f' failed: ER_ALTER_OPERATION_NOT_SUPPORTED_REASON (1846): LOCK=NONE is not supported. Reason: COPY algorithm requires a lock. Try LOCK=SHARED

      If it's expected, it needs to be documented, I didn't find it so far.

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          relates to

          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

          Technical task - A technical task. MDEV-28808 Test MDEV-16329 (ALTER ONLINE TABLE) - Core server part

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

          Activity

            serg Sergei Golubchik added a comment -

            This is, of course, intentional. Online ALTER works by remembering all changes done to the original table while it's being converted and applying them later in a catch-up step. The total row ordering cannot be guaranteed in this case.

            serg Sergei Golubchik added a comment - This is, of course, intentional. Online ALTER works by remembering all changes done to the original table while it's being converted and applying them later in a catch-up step. The total row ordering cannot be guaranteed in this case.

            People

              serg Sergei Golubchik
              elenst Elena Stepanova
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                Resolved:

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