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Upgrading or Downgrading MySQL

This section describes the steps to upgrade or downgrade a MySQL installation.

Upgrading is a common procedurę, as you pick up bug fixes within the same MySQL release series

or significant features between major MySQL releases. You perform this procedurę first on some test

systems to make surę everything works smoothly, and then on the production systems.

Downgrading is less common. Typically, you undo an upgrade because of some compatibility or

performance issue that occurs on a production system, and was not uncovered during initial upgrade

verification on the test systems. As with the upgrade procedurę, perform and verify the downgrade

procedurę on some test systems first, before using it on a production system.