![]() innodb_force_recovery must be less than 3.The shutdown time may be notably larger with 0 than for 1 as there are a lot more cleanups done for 0, however when preparing for an upgrade this should not be an issue. The safest and recommended option for upgrades is 0. Ensure that the innodb_fast_shutdown variable is not 2 (fast crash shutdown) or 3. ![]() This is necessary because even if data files are compatible between versions, recovery logs may not be. At least, take a copy of the mysql data directory with mariadb-dump -add-drop-table mysql (called mysqldump in MariaDB 10.3 and earlier) as most of the upgrade changes are done there (adding new fields and new system tables etc). For example, in 10.5 TokuDB is not supported. Ensure that the target MariaDB version supports the storage engines you are using.Go through the individual version upgrade notes (listed below) to look for any major changes or configuration options that have changed.Note that if you are using MariaDB Galera Cluster, you have to follow the Galera upgrading instructions! Requirements for Doing an Upgrade Between Major Versions All older versions should work too (as long as the storage engines you were using are still around). MariaDB Corporation regularly runs tests to check that one can upgrade from MariaDB 5.5 to the latest MariaDB version without any trouble. The MariaDB replica can be of any newer version than the primary. ![]() You don't normally need to upgrade any of your old clients to be able to connect to a newer MariaDB version.
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