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тАО11-02-2003 08:53 PM
тАО11-02-2003 08:53 PM
renicing processes and Oracle
I have heard,that renicing in HP-UX of
several main processes in Oracle,
like DBWR,LGWR,ARCH and so on...
could improve DB-performnce?
Does anybody know more about it?
Any experiance? Please explain me which processes could be reniced, and which not?
What can be the values?
Excuse me, if it is stupid question.. :))
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тАО11-02-2003 09:32 PM
тАО11-02-2003 09:32 PM
Re: renicing processes and Oracle
Where did you hear that?
It's a new one on me, and I can't find anything on metalink, but I'm willing to be convinced.
-- Graham
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тАО11-04-2003 12:24 PM
тАО11-04-2003 12:24 PM
Re: renicing processes and Oracle
-
hth,
Stan
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тАО11-04-2003 01:16 PM
тАО11-04-2003 01:16 PM
Re: renicing processes and Oracle
You can use paid add in products like PRM to tune performance and give oracle higher priority.
But: What happens if you give Oracle too much priority and there aren't enough cycles for I/O?
Answer: Not very much.
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
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тАО11-04-2003 02:05 PM
тАО11-04-2003 02:05 PM
Re: renicing processes and Oracle
'It depends'.
If you consider to start turning knobs, be sure to have a measurement in place for feedback. At least 'overall trhoughput', like the run time for a typical batch job.
You may also have a few specific, heavy hitting, statspack timed events in mind (for example log file sync) when you turn a know like the lgwr prio.
As a first stab to playing with priority I'd recommend to add the init.ora param:
HPUX_SCHED_NOAGE = 178
Hein.
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тАО11-04-2003 06:06 PM
тАО11-04-2003 06:06 PM
Re: renicing processes and Oracle
priorities of Oracle processes, either system or client processes, should not be changed on OS level. This will do more harm than good. Let Oracle take care of itself.
regards,
Thierry.