MySQL Reference Manual for version 4.0.18.

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2.5.3 Upgrading from Version 3.23 to 4.0

In general, you should do the following when upgrading to MySQL 4.0 from an earlier version:

MySQL 4.0 will work even if you don't do the above, but you will not be able to use the new security privileges that MySQL 4.0 and you may run into problems when upgrading later to MySQL 4.1 or newer. The ISAM file format still works in MySQL 4.0 but it's deprecated and will be disabled (not compiled in by default) in MySQL 4.1. MyISAM tables should be used instead.

Old clients should work with a Version 4.0 server without any problems.

Even if you do the above, you can still downgrade to MySQL 3.23.52 or newer if you run into problems with the MySQL 4.0 series. In this case, you must use mysqldump to dump any tables that use full-text indexes and reload the dump file into the 3.23 server. This is necessary because 4.0 uses a new format for full-text indexing.

The following is a more complete list that tells what you must watch out for when upgrading to version 4.0:


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