After I upgraded my VPS from MySQL 4 to MySQL 5 the following error was encountered:

Error: Connection to the database server has failed:
Table 'mysql.procs_priv' doesn't exist

OS: centos-4-x86. The MySQL version currently is 5.1 by viewing mysql --version, but there is no connection possible. I used yum to update the sql

yum upgrade mysql

Is it possible that I've forgot to use some commands, like copying a new mysql ini to a specific location, just like you need to when upgrading php4 to 5?