IPCS in linux

thiyagusham · 11-19-2012, 06:07 PM

Hi to all;

I interpret Semaphores and Shared Memory Allocations
in linux to oracle 10g Database.

PHP Code:



[root@localhost ~]# cd  /proc/sys/kernel 
[root@localhost kernel]# cat sem 
250     32000   100     128

ipcs -s

PHP Code:



root@localhost ~]# ipcs -ls 
------ Semaphore Limits -------- 
max number of arrays = 128 
max semaphores per array = 250 
max semaphores system wide = 32000 
max ops per semop call = 100 
semaphore max value = 32767

128*250 = 32000
what's the logic behind to get 32000.
I red so many links , make me lot of confusions. could anyone clarify my doubt ?

I need some clear details about Semaphores related to oracle database.

TB0ne · 11-20-2012, 10:02 AM

Quote:

Originally Posted by thiyagusham

Hi to all;
I interpret Semaphores and Shared Memory Allocations in linux to oracle 10g Database.

128*250 = 32000
what's the logic behind to get 32000. I red so many links , make me lot of confusions. could anyone clarify my doubt ?
I need some clear details about Semaphores related to oracle database.

The best people to ask would be Oracle tech support....since you're paying for Oracle, give them a call. Aside from what's already out on Oracle's knowledegbase regarding this (you DID check there first, right?), there's little else we can tell you. Oracle can tell you why they're using that figure.

mandyapenguin · 11-20-2012, 10:57 AM

Quote:

128*250 = 32000
what's the logic behind to get 32000.
I red so many links , make me lot of confusions. could anyone clarify my doubt ?

Are you looking for multiplication in command line?

Code:

expr 128 \* 250