Upgrading to a newer major version of MariaDB - Valerii Kravchuk - FOSDEM 2021
Channel: MariaDB Foundation
Date: 08/02/2021

What mysql_upgrade really does and what problems remain.

With MariaDB in a general case, it should be possible to easily and directly upgrade from one major version to the other, skipping any number of intermediate major versions in between. 

The mysql_upgrade utility is designed to fix all incompatibilities in the mysql.* system tables. In this talk the details of its implementation and actions are discussed, as well as some known bugs and problems that it does not solve. 

Upgrades to MariaDB 10.4 and 10.5 are covered, from versions at least as old as MySQL 5.5.

Links:
* mysql_upgrade - https://mariadb.com/kb/en/mysql_upgrade/
* Slides - https://fosdem.org/2021/schedule/event/mariadb_upgrade/attachments/slides/4266/export/events/attachments/mariadb_upgrade/slides/4266/Upgrading_to_a_newer_major_version_of_MariaDB_FOSDEM_2021.pdf