Why is Oracle Response time getting slow with time.

Hi,
     I have DB which was very fast initially with the response time for one of the query < 5 sec.
     I have been using the DB for the last 15 days. Now the same query is taking 10 minutes. In the DB there are lot of operations of additions and deletions been done on the table where the query is being made. The no. of records in the table is constant at around 3 million records from the first day.
     If I import the DB into a new setup then again the response time becomes very good in the new setup.
     What should be the problem of the DB getting slow with the time.
Thanks,
Tuhin

It all depends on several factors.
Are your tables,indexes have upto-date statistics?
I have DB which was very fast initially with the response time for one of the query < 5 sec. Initially there might be small amount of data later data might have increased,you dont have proper indexes.
It could be that your indexes got fragmented to due to heavey deletes? It might need reorg.
My suggestion would to look into your execution plan of the quries and see where your kernals are waiting.
As other suggested you, use explain plan, event 10046 and tkprof.
Jaffar

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