Create_user_priv of "N" doesn't "disable" create user command
(Using 5.1.41)
I have created a "DBA" user account for certain account commands, but I don't want the DBA account to create new user accounts. Only my "root" account on localhost is authorized to do that. However, in the mysql.user table the Create_user_priv is marked "N" but my DBA account can still do "create user 'foo'". I have the "Grant_priv" "Y" because the DBA account does specific grant to an existing user account.
Why is the create user command succeeding, and how can I disable it? Below are the Y/N columns for the mysql.user table for my DBA user, if that is helpful.
'Y', 'Y', 'Y', 'Y', 'Y', 'Y', 'N', 'N', 'N', 'N', 'Y', 'N', 'Y', 'Y', 'N', 'N', 'Y', 'Y', 'Y', 'N', 'N', 'Y', 'Y', 'Y', 'Y', 'N', 'N', 'Y',