Re: Needing to brush up on my internals -- FTS and DB buffer cache

From: Tanel Põder <tanel.poder.003_at_mail.ee>
Date: Wed, 28 Apr 2004 18:49:11 +0300
Message-ID: <036101c42d38$59d905b0$28a423d5@porgand>

Hi!

Check this post from Steve Adams:

http://dbforums.com/t895237.html

Tanel.

Original Message ----- From: "Jesse, Rich" <Rich.Jesse_at_quadtechworld.com> To: "ORACLE-L (E-mail)" <oracle-l_at_freelists.org> Sent: Wednesday, April 28, 2004 5:09 PM Subject: Needing to brush up on my internals -- FTS and DB buffer cache

> 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 - 10:51:33 CDT