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06-03-2004 04:57 AM
06-03-2004 04:57 AM
Hi Gurus,
Please I would like to know the max. value for the kernel parameter semmns (semaphors) . My Oracle guys want us to increase this value but we don't know the max it can take.
Hoping to hear from you soon
Sam
Solved! Go to Solution.
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06-03-2004 05:09 AM
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06-03-2004 05:46 AM
06-03-2004 05:46 AM
Re: Kernel parameter - semmns
This may help,
http://docs.hp.com/hpux/onlinedocs/939/KCParms/KCparam.SemMNS.html
Hope this helps.
Regds
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06-03-2004 05:55 AM
06-03-2004 05:55 AM
Re: Kernel parameter - semmns
SEMMNS 500
Maximum number of individual IPC semaphores available to system users, system-wide
Attached is a Oracle 8i Requirements on HP-UX
Rgds...Geoff
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06-03-2004 06:23 AM
06-03-2004 06:23 AM
Re: Kernel parameter - semmns
Regards,
Fred
"Reality is just a point of view." (P. K. D.)
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06-03-2004 06:29 AM
06-03-2004 06:29 AM
Re: Kernel parameter - semmns
What version of HP-UX are you referring to so you can be sure the max value is appropriate for your version?
SEMMNS is the setting for the total number of Semaphores allowed system wide and may differe between versions.
Oracle Support typically does not recommend specific values for semaphore kernel
parameters. Instead, use the information provided in this document to set the
parameters to values that are appropriate for your operating environment.
For more info on setting Oracle SEMAPHOREs, look at the following link:
http://www.dbforums.com/t497029.html for calculating Oracle's SEMAPHORE requirements.
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06-03-2004 06:36 AM
06-03-2004 06:36 AM
Re: Kernel parameter - semmns
Meant to also ask, what version of Oracle are you referring to?
Based on configuring SEMAPHOREs for Oracle ... For every "processes=" in the init"SID".ora Oracle needs one semaphore (semmns).
Also, there's a good bit of information about kernel paramater configuration for Oracle at: http://www.orafaq.org/faqdbain.htm
This is a good read and reference site. Hope this helps.
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06-04-2004 02:49 AM
06-04-2004 02:49 AM
Re: Kernel parameter - semmns
Sorry, I could not reply early enough because of some internet problems with my PC.
I am running HP-UX 11i with 2GB RAM. The Oracle version is 8i. They want me to set the semmns value to 760 because they want to run 2 instances on the same box.
Regards
Sam
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06-04-2004 02:58 AM
06-04-2004 02:58 AM
Re: Kernel parameter - semmns
Bruno
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06-04-2004 03:24 AM
06-04-2004 03:24 AM
Re: Kernel parameter - semmns
Generally
SEMMNS = Sum of all PROCESS parameter of all Databases on the machine +
the largest one again + 10 for each database
This is intersting
http://www.smart-soft.co.uk/Oracle/oracle-collaboration-suite-installation-guide.htm
HTH
Bruno
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06-04-2004 03:51 AM
06-04-2004 03:51 AM
Re: Kernel parameter - semmns
My advice would be:
semmni (NPROC)
semmns (SEMMNI*2)
semmnu (NPROC-4)
You increase maxusers? I has an impact on NPROC.. etc...
like that you dont have to fight with a value..
I have configured a few 11i boxes like that and it seems to do the job
All the best
Victor
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06-04-2004 05:39 AM
06-04-2004 05:39 AM
Re: Kernel parameter - semmns
Thanks for the additional info. You should have no problem setting semmns to 760, however, your question was to "know the max" ... I believe Bruno is correct @ 32000. We are running Oracle 9i and our parameters are:
SEMMAP=128
SEMMNI=128
SEMMNS=32000
SEMMSL=250
SEMOPM=250
SHMMAX=1073741824
SHMMAXPGS=65536
SHMMNI=4096
SHMSEG=4096
Good luck!