From: Green, Simon (SGreen@KRAFTEUROPE.COM)
Date: Fri Sep 20 2002 - 04:41:16 EDT
If you have enough memory and your tuning parameters are correct an AIX
system does not need to page. (Subject, as always, to the vagaries of your
applications.)
The 200 pages of free memory is normal: memory is a valuable resource and
AIX is smart enough not to leave it unused. The exact amount of free memory
can be tuned, but it's only there to allow the system to cope with a sudden
demand.
8GB is quite a lot. It's possible that the Oracle admins have created
excessively large buffers but I think it's more likely that you need to do
some work with vmtune.
The main things to check are the minperm and maxperm (-p &-P) parameters.
There are lots of posts on this subject in the archive.
Note that vmtune is not installed by default: you may have to install it
yourself. It's part of bos.adt.samples, which is on the normal AIX CDs.
Simon Green
Philip Morris ITSC Europe
AIX-L Archive at http://marc.theaimsgroup.com/?l=aix-l&r=1&w=2
AIX FAQ at http://www.faqs.org/faqs/aix-faq/
N.B. Unsolicited email from vendors will seldom be appreciated.
-----Original Message-----
From: Rod Jenkins [mailto:RodJ@IOWATELECOM.COM]
Sent: 19 September 2002 16:44
To: aix-l@Princeton.EDU
Subject: Memory and paging questions
Hello all,
Here is my question:
Will perform page-in's and page-out's during regular operation?
Here is the background:
We have an S80 with 8GB of memory running oracle on AIX 4.3.3. During the
day, we have less that 200 pages of memory left. The system continues to
page, as I would expect. In my opinion, we have over allocated memory in
Oracle, or are allowing too may concurrent connections for the memory we
have. I say we need to add memory or limit the concurrent users. My boss
is of the mind that no matter how much memory we add AIX will page.
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