AW: Kernel parameters
thanks for your reply,
I get this :
SIGSEGV received at bfffe2e8 in
Writing stack trace to javacore15981.txt ... OK
/oracle/bin/dbassist: line 103: 15981 Speicherzugriffsfehler $JRE_EXEC
"Speicherzugriffsfehler" means Memory access error...
As you say we have 25 instances on this machine...
Another question is , are the values of shmmax and shmall in bytes?
Von: Karl E. Jorgensen [mailto:email@example.com]
Gesendet: Freitag, 18. Oktober 2002 14:54
Betreff: Re: Kernel parameters
On Thu, Oct 17, 2002 at 10:47:06AM +0200, Yildiz, Murat wrote:
> Hi ,
> I have searched the maillist archive but found nothing.
> Where can I find documentation about kernel parameters?Especially for
> under /proc/sys/fs , vm and kernel.
> What I want to do is , lowering the filesystem cache rate, so the Oracle
> Databases (over 20 instances) may allocate more memory.I have the feeling
> the OS doesn't give back cached memory back when asked, because I am
> memory errors from Oracle.
What memory errors are you getting? (I'm not sure about the "feeling"; it
seems a bit unsubstantiated.)
Oracle likes to keep the SGA in memory, and uses lots of shared memory
and a couple of semaphores to accomodate that. Check the oracle install
guide - you should find references to modifying
On most systems, this is not a problem, but for a highly-tuned
production database (or a single box with lots of databases) it can get
a little tight.
Karl E. Jørgensen
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