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I am running a busy forum on mySQL-4.0.13. No problems. Actually seems to run faster than before.
As advised, I dumped my vBulletin DB before upgrading (from mySQL 3.23.55) and then restored it (the "mysql -p < infile.sql" thingy).
I guess you will have problems if you try to upgrade from 3.x to 4.x and copy the 3.x data files over to the 4.x installation (the lazy thing - which is probably what the ISP did, I'm guessing).
The mySQL manual specifically states that data files are only compatible within the same base version number of mySQL.
If you are upgrading from 3.x to 4.x, dump the databases and restore. Do not just copy the data files over - you will have problems.
As advised, I dumped my vBulletin DB before upgrading (from mySQL 3.23.55) and then restored it (the "mysql -p < infile.sql" thingy).
I guess you will have problems if you try to upgrade from 3.x to 4.x and copy the 3.x data files over to the 4.x installation (the lazy thing - which is probably what the ISP did, I'm guessing).
The mySQL manual specifically states that data files are only compatible within the same base version number of mySQL.
If you are upgrading from 3.x to 4.x, dump the databases and restore. Do not just copy the data files over - you will have problems.
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