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Setting fetch size for fast retrieval of data  RSS feed

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I have a doubt implementing setting the fetch size.I set the fetch size for statement and result set as follows.
but if i'm changing(increase or decrease) fetchsize of statement as well as rs , the time required for processing increase ,and i found that this combination gaves the better result.Number of records fetched is 304.
Why it is behaving like this ? can any one help me ?
is there any connection between number of rows expected and fetch size.If it is then suggest me how to find suitable combination.
We are using connection pool from an application server.
Also if i'm using a cachedrowset how can i set the fetchsize if i'm using rowset.exceuteonnection con);
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