In general, I do not attempt to resolve specific performance problems that are submitted directly to me. Oracle’s OTN forums (see the link at the right under the heading BLOGROLL) usually attract quite a few talented people who are happy to offer assistance with performance troubleshooting. One of the things that I suggest that you do is change the table and index names, as well as change the database name when posting requests for tuning help (be very consistent with how you change the names – it will make a difference).

If you know that you have a problem with a specific SQL statement, start by analyzing the actual execution plan that is retrieved by DBMS_XPLAN – see the blog article index for specific articles about this feature. Also consider using a 10046 trace at level 8 or 12 to help with the analysis – see the blog article index for specific articles about this feature. Randolf Geist put together an excellent guide to help people begin the troubleshooting process. That guide could very well help pinpoint the exact problem that you are experiencing:
http://oracle-randolf.blogspot.com/2009/02/basic-sql-statement-performance.html

I was going through most of the articles and they are really awesome. Its gr8 that you spend so much time fixing performance issues for people. Well i have around 3 years of experience in database administration but i am very much interested in learning Query Tuning.I have a query that i want to take your inputs ,its performing slow. I am not comfortable posting it on any blogs due to security issues. Is there any secured website i can post the query ?