Database Benchmarking: How to start

Dear Experts,
How to start bechmark database performence ?
Regards
Sunil Kumar

Dear Sir,
Thanks for the link, but at this moment I can not open any web page rather then oracle.com domain.
I am woking in a kind of enviroment where workload and queries are not filxed...
(oracle 10gR2,HP-UX 11.31)
One problem is that we captured some queries are showing high resource consumption, but what if they supposed to do so ? Application team not alway able to provide rigth picture about this.
I wonder who should be in picture to resolve these kind of issues ?
Regards
Sunil Kumar

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