RE: ASH Buffer max size

  • From: "Milen Kulev" <makulev@xxxxxxx>
  • To: <martin.a.berger@xxxxxxxxx>
  • Date: Thu, 16 Apr 2009 22:49:30 +0200

Hallo Martin,
yes, the information is pretty contradictory.
I will test it myself and I will post the result to the list.

Best Regards.
Milen 

-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]
On Behalf Of Martin Berger
Sent: Donnerstag, 16. April 2009 21:25
To: makulev@xxxxxxx
Cc: oracle-l@xxxxxxxxxxxxx
Subject: Re: ASH Buffer max size

Hi Milen,

a short google search brought some ambiguous informations:
it's controlled by _ash_size
one formula is
Max( Min ( No. of CPU * 2 M, 5% of SHARED_POOL_SIZE, 2% of  
SGA_TARGET) ,1M) -
http://www.nyoug.org/Presentations/2006/September_NYC_Metro_Meeting/200609Jo
hal_Oracle10gs%20As.pdf 
.
another: max (min (#of CPUs * 2MB, 5% of SHARED_POOL_SIZE, 30MB), 1MB)  
-
http://www.mhprofessional.com/downloads/products/007222729X/007222729X_chp09
.pdf

both seem to be about 10g.

Currently I have no informations if there are any changes in 11g, sorry.

happy testing with _ash* parameters.

hth,
  Martin


>
> Hallo Listers,
> I have s simple question:
> What is the maximum size if ASH buffers.
> Some documents say it is 30Mb, other documents say it is 128MB (for  
> 10GR2).
>
> Is there any change in the upper ASH buffers size 11GR1 ?
>
> Many thanks in advance.
>
> Best Regards. Milen
> --
> //www.freelists.org/webpage/oracle-l
>


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