Re: Solaris 10 shmmax
- From: amonte <ax.mount@xxxxxxxxx>
- To: "Bobak, Mark" <Mark.Bobak@xxxxxxxxxxxxxxx>
- Date: Mon, 26 Mar 2007 20:20:15 +0200
Hi
The box I have installed were Sun Blades, with four AMD Opteron Dual Core
CPUs and 8GB Memory.
Mark if shmmax does not matter I dont understand why it is a requirement in
Oracle 10gR2 Installation Guide ....
On 3/26/07, Bobak, Mark <Mark.Bobak@xxxxxxxxxxxxxxx> wrote:
Does it really matter if your shared memory is in one chunk or not? I
seem to remember a bit of misinformation that used to float around was that
if the SGA was not in a single shared memory chunk, then ISM was disabled.
Turns out that isn't true. I can't think of any reason why it would be
important for the SGA to be in one contiguous memory chunk.
-Mark
*--*
*Mark J. Bobak*
*Senior Oracle Architect*
*ProQuest/CSA*
"There are 10 types of people in the world: Those who understand binary,
and those who don't."
------------------------------
*From:* oracle-l-bounce@xxxxxxxxxxxxx [mailto:
oracle-l-bounce@xxxxxxxxxxxxx] *On Behalf Of *Kevin Closson
*Sent:* Monday, March 26, 2007 1:09 PM
*To:* Hameed, Amir; ax.mount@xxxxxxxxx; oracle-l@xxxxxxxxxxxxx
*Subject:* RE: Solaris 10 shmmax
The 490 is a flat memory box and the Solaris port is smart enough to
behave correctly.
On the other hand, I have a lab server( Sun v490) running 10.2.0.2 on
Solaris9. The shmmax is set to 20GB. My SGA is 12GB and I am seeing only one
segment from ipcs. I have not tinkered with the NUMA optimization parameter.
Per Metalink note 39926.1, multiple shared memory segments in 10gR2 are
there for performance reason. Why is the behaviors of shared memory segments
in 10gR2 is different on the same platform (v490 versus 6900)?
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