How to find which query need to tuned

Hi ,
How can i find , which query need to tuned . Is there any mechanism behind it?

The mechanisms behind it are depending on your database version.
For example:
Oracle 9i has STATSPACK that helps you to identify possible problem queries.
Oracle 10g has AWR - Automatic Workload Repository
Oracle 11g has SPA - Database Replay SQL Performance Analyzer
but there are many more tools/mechanisms...trace/tkprof for example.
Go to http://tahiti.oracle.com and do a search on 'performance tuning guide', and pick the one that matches your (sofar unknown) database version, read a bit every now and then and see what tools are at your disposal and fit your requirement and situation.
Besides the links that Blu already posted, searches on http://asktom.oracle.com also give lots of pointers and explanations regarding the (neverending) tuning process (at least: helped me tremendously in understanding the tuning process, the do's and dont's).
Make sure you don't get CTD (Compulsive Tuning Disorder) from all this... ;)

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