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Showing content from https://mariadb.com/kb/en/system-variable-differences-between-mariadb-106-and-mysql-80/ below:

System Variable Differences Between MariaDB 10.6 and MySQL 8.0

The following is a comparison of variables that either appear only in MariaDB 10.6 or MySQL 8.0, or have different default settings in MariaDB 10.6, and MySQL 8.0. The stable releases MariaDB 10.6.4 and MySQL 8.0.11, with only default plugins enabled, were used for the comparison. Note that MySQL 8 is an 'evergreen' release, so features may be added or removed in later releases.

For a more complete list of differences, see Incompatibilities and Feature Differences Between MariaDB 10.6 and MySQL 8.0 and Function Differences Between MariaDB 10.6 and MySQL 8.0

The most notable differences are that MariaDB includes, by default, the Aria storage engine (resulting in extra memory allocation), Galera Cluster, and has a different thread pool implementation. For this reason, a default implementation of MariaDB 10.6 will use more memory than MySQL 8.0. MariaDB 10.6 and MySQL 8.0 also have different GTID implementations.

MariaDB's extra memory usage can be handled with the following rules of thumb:

• If you are not using MyISAM and don't plan to use Aria:
  • Set key_buffer_size to something very low (16K) as it's not used.
  • Set aria_pagecache_buffer_size to what you think you need for handling internal tmp tables that didn't fit in memory.
  • Normally this is what before you had set for key_buffer_size (at least 1M).
• If you are using MyISAM and not planning to use Aria:
  • Set aria_pagecache_buffer_size to what you think you need for handling internal tmp tables that didn't fit in memory.
• If you are planning to use Aria, you should set aria_pagecache_buffer_size to something that fits a big part of your normal data + overflow temporary tables.

• System Variable Differences Between MariaDB 10.5 and MySQL 8.0
• Incompatibilities and Feature Differences Between MariaDB 10.6 and MySQL 8.0
• Function Differences Between MariaDB 10.6 and MySQL 8.0

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