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тАО09-19-2002 02:35 PM
тАО09-19-2002 02:35 PM
Re: Oracle IO Problems VA7400 or MOD12H
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тАО09-20-2002 05:27 AM
тАО09-20-2002 05:27 AM
Re: Oracle IO Problems VA7400 or MOD12H
Is there any other parameter in the list above, that need to be modified, Ray mentioned the DBC_MIN and DBC_MAX values.
Thank you very much everyone.
Aziz.
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тАО09-20-2002 05:56 AM
тАО09-20-2002 05:56 AM
Re: Oracle IO Problems VA7400 or MOD12H
First, I'd set these so that the max of dbc_mac_pct would result in around 400M of you memory:
So if you have 4GB, set
dbc_max_pct 10
dbc_min_pct 2
Secondly, the va7400 is light years ahead of the 12H. I had one for 8 months as an evaluation and it rocked. Basically I set it up and walked away from it until I had to give it back to HP! Plus, you'll be switching from SCSI to fibre!
live free or die
harry
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тАО09-20-2002 06:14 AM
тАО09-20-2002 06:14 AM
Re: Oracle IO Problems VA7400 or MOD12H
Do I double the values of dbc_min and max ?
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тАО09-20-2002 07:07 AM
тАО09-20-2002 07:07 AM
Solutionto somewhere between 80000-100000 (320-400MB) and thus disabling dynamic buffer cache.
All of this pales, including faster disk arrays,
into insignificance compared to the effect of your current timeslice setting.
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тАО09-20-2002 08:22 AM
тАО09-20-2002 08:22 AM
Re: Oracle IO Problems VA7400 or MOD12H
dbc_min_pct=2
dbc_max_pct=5
timeslice=10
bufpages=100000
Please let me know if there is anything else.
Thank you all.
aziz.
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тАО09-20-2002 10:25 AM
тАО09-20-2002 10:25 AM
Re: Oracle IO Problems VA7400 or MOD12H
dbc_xxx_pct values because when bufpages is set to a non-zero value, these parameters are ignored. I would also suggest that you consider installing PHKL_21678 (if applicable to your OS); the disk sort fairness algorithm could be one source of your problems. I wouldn't do the patch at this time because I think you are going to see a marked improvement from the timeslice setting. When that is done, you have a much better chance of correctly spotting other bottlenecks.
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тАО09-20-2002 10:53 AM
тАО09-20-2002 10:53 AM
Re: Oracle IO Problems VA7400 or MOD12H
I read somewhere that if you change the bufpages you also need to change the nbuf parameter.
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тАО09-20-2002 11:41 AM
тАО09-20-2002 11:41 AM
Re: Oracle IO Problems VA7400 or MOD12H
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