Upgrading or Downgrading MySQL

Upgrading or Downgrading MySQL
This section describes the steps to upgrade or downgrade a MySQL installation.
Upgrading is a common procedure, as you pick up bug fixes within the same MySQL release series
or significant features between major MySQL releases. You perform this procedure first on some test
systems to make sure 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 procedure, perform and verify the downgrade
procedure on some test systems first, before using it on a production system.
... zobacz całą notatkę