Upgrading MySQL

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Before upgrading any major version of MySQL to a different major version (ie: 3.23, 4.0, 4.1, 5.0), you should read the MySQL Reference Manual's chapters on upgrading:

For minor version upgrades, there is generally nothing to be concerned about (4.1.7 to 4.1.8), but you should always read the version change logs, also located in the MySQL Reference Manual: