Re: Red Hat ES4. 0 kernel settings
- From: Paul Drake <bdbafh@xxxxxxxxx>
- To: avramil@xxxxxxxxxxxxxx
- Date: Thu, 20 Oct 2005 18:15:55 -0400
On 10/20/05, Lou Avrami <avramil@xxxxxxxxxxxxxx> wrote:
> Hello all,
>
> I'm about to do my first Linux Oracle RDMBS installations. I'll be
> installing both 9.2.0.7 and 10gR2 on a Red hat ES 4.0 server with 4 gig of
> memory.
>
Lou,
start here:
http://www.puschitz.com/InstallingOracle10g.shtml
Paul
> As with most other Unixes, the kernel settings must be adjusted. The
> "defaults" would be something like
>
> SHMMAX = 2147483648
> SHMMIN = 1
> SHMMNI = 100
> SEMMNS = 1000
> SEMMSL = 250
> SEMMNI = 100
> SEMOPM = 100
>
> In Solaris, I had quite a bit of successful following the advice in the book
> "Configuring & Tuning Databases on the Solaris Platform". On pages 202-204
> the author suggests setting the shared memory parameters high, so that it
> isn't necessary to go back and change them later. An example /etc/system
> from the book looked like this:
>
> * Semaphore parameters
> set semsys:seminfo_semmap = 1026
> set semsys:seminfo_semmsl = 300
> set semsys:seminfo_semmns = 2500
> set semsys:seminfo_semmnu = 2500
> set semsys:seminfo_semume = 2500
> set semsys:seminfo_semmni = 2500
> set semsys:seminfo_semopm = 150
>
> * Shared memory parameters
> set shmsys:shminfo_shmmax=0xFFFFFFFF
> set shmsys:shminfo_shmmni=1024
> set shmsys:shminfo_shmseg=1024
>
> I think I would like to do something similar for this Linux server, set the
> semaphores and shared memory parameters high enough so that they don't have
> to be revisited. Does this make sense for Linux? For Solaris there is no
> penalty for for stting these parameters "too high". Does that also hold true
> for Linux? For the Linux kernel parameters, what might be considered "high
> enough"?
>
> Thanks,
> Lou Avrami
>
>
>
> --
> //www.freelists.org/webpage/oracle-l
>
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