Tunned query going back slow

A query after analyzing tables was running in 2 seconds, but once another query is run, it again goes back to 28 seconds. So, I think, its parsing the query that is taking lot of time. How do we handle this situation?

I think your analysis of the situation is in error.
I also think we have wholly insufficient information to help you further.
1. What hardware, operating system, and storage?
2. What version of what product (all three decimal places not just the marketing name)
3. DDL for table and indexes
4. DML for the statement
5. Explain plan report generated using dbms_xplan.display
http://www.morganslibrary.org/reference/explain_plan.html
http://www.morganslibrary.org/library.html
Tuning is not something that can be done in a vacuum.

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