How to cache out the parse plan up front?

Hi,
Basically I have 2 questions:
(1) When you run a query the first time ,it usually takes longer time because Oracle will parse it to get execution plan first. But afterwards, because of caching , it runs faster. How do I set up so that this step can be skipped when user runs first time?
In other words, any standard method to get the query execution plan planed out first and cache it in the Oracle.
(2) Is this cache per session? Can I keep it always in the cache and not cycled out? Also if per session, can I possibly make it per database wise?
Thanks in advance!
Acton

1) Perhaps, perhaps not. There are too many variables that can influence execution time. Usually (not always), the parse phase consumes very little of the reponse time. However, I have seen this phase be the #1 contributor to poor response time. If you trace the query, execute it repeatedly, you will be able to see the differences in response time for each phase using tkprof.
You can reuse an execution plan if there is an identical statement in the shared_pool (with certain exceptions if cursor_sharing is set or you are using stored outlines). If the statement does not exist in the shared_pool, it must be 'hard' parsed. Let's assume that neither cursor_sharing nor stored outlines are in use. There is NO way to get around parsing, you must parse to get an execution plan.
Oracle has put a lot of work into making the parse phase efficient. One component of this is how they manage the shared pool. While a large shared pool sounds like you would be able to improve performance by caching all the execution plans, it is usually a bad idea. Let frequently used plans stay in the pool, let one-time or seldom used plans age out. Too many cached statements mean that the session has to search through a lot of 'similar' statements to finally say "Nope, not there, let's parse this statement".
2) You can always keep something in the cache by pinning it. Again, this is not always a good idea (though there are exceptions). Statements and plans are always cached in the shared pool, which are available to all sessions.
Justin - did you mean that the first execution runs slower because the data is NOT cached?
Regards,
Dan Fink

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