Where should I start to do DBMS tuning? and there is a method that can help me ... no matter what dbms is?
Though this site is dedicated to Microsoft SQL Server, I would think that a lot of the troubleshooting methods described here apply to other DBMS as well, in a general sense.
To excel in tuning, you need to make your fundas right. Learn about indexes and access paths. Also learn to analyze execution plan. Roji. P. Thomas http://toponewithties.blogspot.com