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Upgrade issues in MySQL 5.0

EXPERT RESPONSE FROM: Scott Noyes

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QUESTION POSED ON: 13 September 2006
I have upgraded to MySQL 5.0 on my Linux server. It was working fine with MySQL 4.0, but now it doesn't work at all. Could you please help me figure out what is wrong?

EXPERT RESPONSE

"Not working" can mean many things. Here are a few common problems:

MySQL service will not start.
The service starts, but no programs can connect. Make sure that the user has permissions to connect to the server.
Queries that worked in earlier versions no longer work. MySQL implemented a few syntax changes with version 5. Of particular note is the change in JOIN syntax.

See also the upgrade guide.

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