Want a good doc on how to study statspack

I know db tuning is a vast and its very tough to give any thumbrule on how to tune db from statspack report but hope there must be something for me.Its not like I can not understand it at all.I can understand 40% of the report but there are certain things that goes above my head.In order to understand the entire document and to take advantage of the entire report be it AWR or ADDM or STATSPACK is there any ground work document available ? please revert back if you cound sense any.
Thanks
AD

The statspack analysis tool at http://www.oraperf.com/ is very useful in identifying and explaining key areas of the report and their respective impacts / symptoms etc.

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