Where to learn about database tuning from?

Hello,
I need to learn more about database tuning - practical aspect. Are there any sites/services that could help me? I can't use production environment of course, I need to prepare my own ones (Oracle DBs on linux and windows too) and workload too. How to simulate workload from many users?
Thanks in advance for help
Aliq

How do you learn to paint? You can read every book on the subject, attend lectures by famous artists on paints and brushes and styles and what not..
None of this will turn you into an artist that can paint. Theory only goes that far.
And this is as true in performance tuning as in painting. You need to run into that brick wall called experience over and over again - and each time learn hard lessons that no theory can ever teach.
If performance tuning was that easy, we would have had fully automated tuning software in operating systems and database systems that could detect and fix all our performance woes on the fly.
Does not work like that.
Also, performance tuning is many times seen as an "after the fact" thing. Design the system. Code the software. Implement it. Then tune it.
Wrong. Also does not work like that.
Performance tuning begins at the very first workshop when brainstorming the basic design of the system. If performance and scalability are not part of that process, they cannot easily (if at all) be made to be part of the final system as a tuning exercise.
If I need to pass a single fundamental "uber-alles" principle for performance tuning - when dealing with it after the fact (as many of us do), then it is:
Identify The Problem
Do not confuse symptoms as the actual problem.
PS. Performance tuning is also many time (IMO) a situation where you have lost. Why? Because of if the code was designed and coded correctly, then there would not have been a performance issue. If the Oracle architecture was understood correctly, there would not be a problem. Which makes the advice by the other 2 posters so important. Understand Oracle. Understand how to design and code in Oracle. If done well, what is there left to performance tune?

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