thanks for your reply, I get this : host1#oracle:/oracle/network/admin >dbassist
SIGSEGV received at bfffe2e8 in /oracle/jre/1.1.8/lib/linux/native_threads/libjd Writing stack trace to javacore15981.txt ... OK /oracle/bin/dbassist: line 103: 15981 Speicherzugriffsfehler $JRE_EXEC -Duser.S "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? Murat -----Ursprüngliche Nachricht----- Von: Karl E. Jorgensen [mailto:karl@;jorgensen.com] Gesendet: Freitag, 18. Oktober 2002 14:54 An: [EMAIL PROTECTED] 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 those > 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 getting > 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 /proc/sys/kernel/shmmax /proc/sys/kernel/sem 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 [EMAIL PROTECTED] www.karl.jorgensen.com ==== Today's fortune: ..you could spend *all day* customizing the title bar. Believe me. I speak from experience. -- Matt Welsh -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]