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  1. MariaDB Server
  2. MDEV-5171

Add support for --innodb-optimize-keys to mysqldump.

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    Details

    • Type: Task
    • Status: Stalled (View Workflow)
    • Priority: Major
    • Resolution: Unresolved
    • Fix Version/s: None
    • Component/s: None
    • Labels:
      None
    • Sprint:
      10.0.20, 10.0.21

      Description

      Hello and thank you for mariadb,

      If the --innodb-optimize-keys mysqldump option was available with MariaDB I would use it when backing up and moving tables using mysqldump. It can also be used to shrink InnoDB table files on mysqld instances where "ALTER TABLE table_name ROW_FORMAT=Compact" does not result in fast index creation being used and where expand_fast_index_creation is not available so "OPTIMIZE TABLE table_name" and "ALTER TABLE table_name ENGINE=INNODB" do not use fast index creation.

      Having support for expand_fast_index_creation would also be great, but I think there is value from just adding the pragmatic mysqldump option.

      Applying the latest changes with fixes for the mysqldump option to MariaDB 10 was relatively easy. The original work and subsequent patches with tests having been created by Alexey Kopytov.

      Here are some links to the background:

      http://bugs.mysql.com/bug.php?id=57583
      http://bugs.mysql.com/bug.php?id=49120
      http://www.percona.com/doc/percona-server/5.5/management/innodb_expanded_fast_index_creation.html#expand_fast_index_creation
      http://www.mysqlperformanceblog.com/2012/06/19/building-indexes-by-sorting-in-innodb-aka-fast-index-creation/
      http://www.mysqlperformanceblog.com/2011/11/06/improved-innodb-fast-index-creation/
      http://www.mysqlperformanceblog.com/2010/12/09/thinking-about-running-optimize-on-your-innodb-table-stop/
      https://bugs.launchpad.net/percona-server/+bug/989253
      https://bugs.launchpad.net/percona-server/+bug/858945
      https://bugs.launchpad.net/percona-server/+bug/744103
      https://github.com/facebook/mysql-5.6/commit/7862a74ddb48eceaf2a48531d20550752c868a46

      I tested using the example from Mark Callaghan in http://bugs.mysql.com/bug.php?id=57583

      create table rt (i int primary key auto_increment, j float) engine=innodb;
      insert into rt values (null, 1);
      create index x2 on rt(j);
      insert into rt select null, rand(0) from rt;     (21 times for 2,097,152 rows)
       
      120M test/rt.ibd
       
          Data_length: 62472192
         Index_length: 50937856
            Data_free: 7340032
       
      mariadb-10.0.4-linux-x86_64/bin/mysqldump --order-by-primary test rt | mysql -D test2
       
      120M test2/rt.ibd
       
          Data_length: 62472192
         Index_length: 50937856
            Data_free: 7340032
       
      Percona-Server-5.6.13-rel61.0-461.Linux.x86_64/bin/mysqldump --order-by-primary --innodb-optimize-keys test rt | mysql -D test3
       
      92M test3/rt.ibd
       
          Data_length: 62472192
         Index_length: 30998528
            Data_free: 0

      Thanks again.

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              Assignee:
              jplindst Jan Lindström
              Reporter:
              thatsafunnyname Peter (Stig) Edwards
              Votes:
              5 Vote for this issue
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              14 Start watching this issue

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                Created:
                Updated:

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