RE: How much RAM is to much
- From: "CRISLER, JON A (ATTCORP)" <JC1706@xxxxxxx>
- To: <jkstill@xxxxxxxxx>, <gajav@xxxxxxxxx>
- Date: Fri, 11 Feb 2011 18:30:19 -0500
Also agree- putting aside ASM and only talking about filesystems, you
need to make sure the filesystem supports direct_io. You can set it on
the database and I think no error is returned if the filesystem does not
support direct io.
On linux, filesystem cache behavior and swappiness can be controlled via
the /etc/sysctl.conf file or sysctl commands. But I am not sure you can
set an upper limit to cache size- if you can then I don't know how.
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Jared Still
Sent: Thursday, February 10, 2011 4:26 PM
To: gajav@xxxxxxxxx
Cc: Andrew Kerber; RStorey@xxxxxxxxxxxxxxxxxx; oracle-l-freelists
Subject: Re: How much RAM is to much
On Thu, Feb 10, 2011 at 11:58 AM, Gaja Krishna Vaidyanatha
<gajav@xxxxxxxxx> wrote:
Andrew,
There is nothing "off the wall" about what I said. Everyone SHOULD be
using direct I/O but you will be surprised how many we encounter that
still don't.
Agreed.
Jared Still
Certifiable Oracle DBA and Part Time Perl Evangelist
Oracle Blog: http://jkstill.blogspot.com
Home Page: http://jaredstill.com
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