Red Hat ES4. 0 kernel settings

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.

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

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