RE: Swap space requirements on 10g installs - must it really equal RAM?
- From: "Goulet, Dick" <DGoulet@xxxxxxxx>
- To: <JayMiller@xxxxxxxxxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 4 Oct 2005 16:54:00 -0400
Jay,
I use HP-UX or RedHat vs Solaris & we set swap to 2 times ram.
The reason is that swap gets used to hold an image of the operating
process for diagnostic purposes in the event of a system crash. If we
had less than ram for swap we could not start enough processes to use
all of ram.
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of
JayMiller@xxxxxxxxxxxxxxxx
Sent: Tuesday, October 04, 2005 3:00 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: Swap space requirements on 10g installs - must it really equal
RAM?
Hello,
When installing 10G on dev and QA I had gotten the error that we should
configure swap space to equal RAM. Since I figured out 4G of swap space
was
more than enough (why would we need 16G of swap space?) I ignored it,
installed the software, created the database, and had no problems.
But one of the other DBAs was doing the production install and when he
saw
the message he balked and opened a TAR with Oracle. The Oracle support
tech
said that you *should* have swap set = to RAM. To be precise they said:
"...the database should not be installed on a machine having less than a
1:1
ratio of RAM to swap.
I would not advise skipping this message."
Speaking with one of the SAs he said the system won't even recognize
more
than 4G of swap.
Does anyone know of any reason why we would need more than 4G of RAM or
(preferably :) why this isn't really important. Documentation for the
latter would also be nice as I would now have to convince my management
that
this isn't necessary even though Oracle said it was.
Oracle 10.2
Solaris 2.9
16G RAM
4G Swap
Thanks,
Jay Miller
Sr. Oracle DBA
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