Chapter 11 Downgrading MySQL

Table of Contents

11.1 Before You Begin

11.2 Downgrade Paths

11.3 Downgrade Notes

11.4 Downgrading Binary and Package-based Installations on Unix/Linux

11.5 Downgrade Troubleshooting

This section describes the steps to downgrade a MySQL installation.

Downgrading is a less common operation than upgrade. Downgrading is typically performed because of a 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 Chapter 10, Upgrading MySQL), perform and verify the downgrade procedure on some test systems first, before using it on a production system.

Note

In the following discussion, MySQL commands that must be run using a MySQL account with administrative privileges include -u root on the command line to specify the MySQL root user. Commands that require a password for root also include a -p option. Because -p is followed by no option value, such commands prompt for the password. Type the password when prompted and press Enter.

SQL statements can be executed using the mysql command-line client (connect as root to ensure that you have the necessary privileges).