servlet and result set

My question is what is the best and most efficient way to determine the size
of a result set (number of rows returned) ?   The other question is I am
executing a database query and getting possibly 50 results and I want to
display my results 5 per page, is the best way to do this execute one query
and then keep the result set object in the session for building multiple
pages?

Thanks in advance - Scott Carter

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