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  1. MariaDB Server
  2. MDEV-19895

Support "autoset" in SET GLOBAL for AUTO_SET system variables

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    Description

      Some system variables are declared as AUTO_SET, and some of those also support being changed dynamically with SET GLOBAL.

      For example, host_cache_size is declared as AUTO_SET:

      https://github.com/MariaDB/server/blob/mariadb-10.4.6/sql/sys_vars.cc#L5795

      But "autoset" doesn't work with SET GLOBAL:

      MariaDB [(none)]> SET GLOBAL host_cache_size=autoset;
      		 
      ERROR 1232 (42000): Incorrect argument type to variable 'host_cache_size'

      There is special code to handle auto-sizing for this system variable (and others) at startup:

      https://github.com/MariaDB/server/blob/mariadb-10.4.6/sql/mysqld.cc#L4266

      And you can explicitly specify to autoset the AUTO_SET option by using the --autoset option prefix:

      https://mariadb.com/kb/en/library/mysqld-options/#-autoset-

      For example:

      [mariadb]
      		 
      ...
      		 
      autoset_host_cache_size

      Maybe it would make sense to be able to specify the "autoset" value in SET GLOBAL for variables that are declared AUTO_SET?

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          is blocked by

          Task - A task that needs to be done. MDEV-19839 refactor --autoset

          • Major - Major loss of function.
          • Open
          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-19896 --autoset-thread-cache-size doesn't work

          • Major - Major loss of function.
          • Closed

          Task - A task that needs to be done. MDEV-24670 avoid OOM by linux kernel co-operative memory management

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

          Bug - A problem which impairs or prevents the functions of the product. MDEV-27772 Performance regression with default configuration in 10.6

          • Major - Major loss of function.
          • Open

          Bug - A problem which impairs or prevents the functions of the product. MDEV-27784 log_overwrite_warning displays an error instead of a warning

          • Major - Major loss of function.
          • Closed

          Task - A task that needs to be done. MDEV-34026 MySQL 8.4 has changed some defaults, check if this is applicable for MariaDB as well

          • Major - Major loss of function.
          • Open

          New Feature - A new feature of the product, which has yet to be developed. MDEV-36194 Automatic Scaling for Dynamic Environments

          • Major - Major loss of function.
          • Open

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              serg Sergei Golubchik
              GeoffMontee Geoff Montee (Inactive)
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                Updated:

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