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тАО02-28-2002 12:22 PM
тАО02-28-2002 12:22 PM
Our vendor wants a lower number of this kernel parameter then what is already defaulted with the system install.
they want it set to 12 which I find very low? Some of our Oracle servers are set to 1024.
Please advise?
Vito
Solved! Go to Solution.
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тАО02-28-2002 12:30 PM
тАО02-28-2002 12:30 PM
Re: shmseg kernel parameter
Rule Number 1) Ignore DBA'w when tuning kernels. Do they listen to you when tuning their database?
Depending upon what else is running on your box, lowering SHMSEG to 12 may kill some processes. This is the number of separate shared memory attachments allowed by a single process. 1024 is probably high but 12 is probably low. Somewhere in the range of 60-120 should keep everybody happy.
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тАО02-28-2002 12:51 PM
тАО02-28-2002 12:51 PM
SolutionSetting shmseg to 20 is not a good idea. One of my system running 32 bit 11.0 and have Oracle running on that, the shmseg is set to -120.
Normally when tuning kernel, never try to attempt reducing the Kernel Paremeter to a lower value than the default, unless until you are very sure !
For more about shmseg, check this out:
http://www.docs.hp.com/cgi-bin/otsearch/getfile?id=/hpux/onlinedocs/os/KCparam.ShMseg.html&searchterms=shmseg&queryid=20020228-125804
HTH,
Shiju
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тАО03-01-2002 06:48 AM
тАО03-01-2002 06:48 AM
Re: shmseg kernel parameter
In other words - make them give you a good reason. :)
Don
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тАО03-01-2002 06:55 AM
тАО03-01-2002 06:55 AM
Re: shmseg kernel parameter
How many times have you been asked: "are you the priest on saturday night live?"
live free or die
harry
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тАО03-01-2002 06:01 PM
тАО03-01-2002 06:01 PM
Re: shmseg kernel parameter
All shared memory parameters:
shmmax - Max size of a single shared memory segment.
shmmni - Number of shared memory segments systemwide.
shmseg - Number of shared memory segments a single process may attach to.
There are some DBA's which I call "Physical DBA's" which will be able to tune the HP-UX kernel and also lay out a database and optimize the init.ora much better than a "logical dba".
init.ora settings are a black magic for most Oracle DBA's...