Oracle-L: RE: PGA

From: SARKAR, Samir <Samir.SARKAR_at_nottingham.sema.slb.com>
Date: Mon, 31 Mar 2003 07:28:39 -0800
Message-ID: <F001.00576286.20030331072839@fatcity.com>

So whats the reality, Connor ?? I thought it was the reverse which was the myth i.e. it
is often misunderstood as the total memory available to the database user as a whole for sort
operations.....I believe the reality is that the sort area size is the size allocated by Oracle
per user process for sorting data.

Do enlighten me if I am wrong....

Samir

Samir Sarkar
Oracle DBA
SchlumbergerSema
Email : ssarkar2_at_slb.com
Phone : +44 (0) 115 - 957 6028
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-----Original Message-----
Sent: 31 March 2003 15:19
To: Multiple recipients of list ORACLE-L

Oracle Myth #1745

"When u set the sort_area_size for a database, it will allocate that much memory PER USER for any sort operation being performed on the database"

"SARKAR, Samir" <Samir.SARKAR_at_nottingham.sema.slb.com> wrote: > Arvind,
>
> When u set the sort_area_size for a database, it
> will allocate that much
> memory PER USER
> for any sort operation being performed on the
> database. In practice, it
> means that if u allocate
> too high a value for the sort_area_size and multiple
> users are performing
> multiple sorts, the Unix
> system may run out of memory and Oracle will return
> u a process memory
> error.
>
> For eg. if u have ur sort_area_size as 100MB and u
> have 10 users performing
> sort operations
> on the database, Oracle will take up 100*10 MB
> memory. This might degrade ur
> system performance.
>
> Samir
>
> Samir Sarkar
> Oracle DBA
> SchlumbergerSema
> Email : ssarkar2_at_slb.com
> Phone : +44 (0) 115 - 957 6028
> EPABX : +44 (0) 115 - 957 6418 Ext. 76028
> Fax : +44 (0) 115 - 957 6018
>
>
> -----Original Message-----
> Sent: 31 March 2003 11:04
> To: Multiple recipients of list ORACLE-L
>
>
> hello all,
>
> how does increasing the value of SORT_AREA_SIZE
> affect the unix system
> perfomance.
>
>
> Thanks
> Arvind
> --
> Please see the official ORACLE-L FAQ:
> http://www.orafaq.net
> --
> Author: Arvind Kumar
> INET: arvindk_at_sqlstarintl.com
>
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>
> --
> Please see the official ORACLE-L FAQ:
> http://www.orafaq.net
> --
> Author: SARKAR, Samir
> INET: Samir.SARKAR_at_nottingham.sema.slb.com
>
> Fat City Network Services -- 858-538-5051
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Connor McDonald
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_________________________________________________________
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If you are not the intended recipient, be advised that you have received
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If you have received this email in error please notify the
SchlumbergerSema Helpdesk by telephone on +44 (0) 121 627 5600.
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: SARKAR, Samir
  INET: Samir.SARKAR_at_nottingham.sema.slb.com

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Received on Mon Mar 31 2003 - 09:28:39 CST