RE: ASH Buffer max size

From: Milen Kulev <>
Date: Thu, 16 Apr 2009 22:49:30 +0200
Message-ID: <002501c9bed4$d77eded0$867c9c70$_at_net>

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

Best Regards.

-----Original Message-----
From: [] On Behalf Of Martin Berger
Sent: Donnerstag, 16. April 2009 21:25
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) - hal_Oracle10gs%20As.pdf
another: max (min (#of CPUs * 2MB, 5% of SHARED_POOL_SIZE, 30MB), 1MB) - .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.


> 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
> --

Received on Thu Apr 16 2009 - 15:49:30 CDT

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