Re: Solaris 10 shmmax

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_at_il.proquest.com> 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_at_freelists.org [mailto:
> oracle-l-bounce_at_freelists.org] *On Behalf Of *Kevin Closson
> *Sent:* Monday, March 26, 2007 1:09 PM
> *To:* Hameed, Amir; ax.mount_at_GMAIL.COM; oracle-l_at_freelists.org
> *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)?
>
>
>
>
>
>

--
http://www.freelists.org/webpage/oracle-l