Hi, Rich!
Small tables will get to the MRU. Big tables to LRU.
If you are using parallel execution then the blocks
will be read from disk to PGA.
Cheers / Jocke Treugut
www.treugut-tuning.com
- "Jesse, Rich" <Rich.Jesse_at_quadtechworld.com>
skrev: > While surfing Google for HP-UX questions, I
ran
> across an Oracle guru page
> that says this:
>
> "Remember, when Oracle performs a full-table scan,
> the database blocks are
> read directly into the program global area (PGA),
> bypassing the data buffer
> RAM."
>
> It's been awhile since I took the Oracle7 DBA
> courses, but I have it stuck
> into my head that FTS data was plopped into the LRU
> end of the DB buffer
> cache's LRU list, instead of the MRU end.
>
> I gave up trying to look through my course material
> (my suggestion of an
> *INDEX* in the student guides apparently wasn't
> implemented) and MetaLink
> showed nothing. I couldn't find anything directly
> in the 8i docs, either,
> but a reference to the CACHE hint that says it
> causes FTSs to go to the MRU
> end of the buffer cache LRU list, but it doesn't say
> what happens by default
> and I didn't want to assume it was how I remembered
> it.
>
> So, is my memory just bad (it's not unusual) or
> what? Has this changed over
> versions? The article doesn't say what version of
> Oracle the author was
> referring to.
>
> TIA,
> Rich
>
> Rich Jesse System/Database
> Administrator
> rich.jesse_at_quadtechworld.com QuadTech, Sussex,
> WI USA
>
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Received on Wed Apr 28 2004 - 09:14:55 CDT
