Oracle-L: RE: PGA

From: <Jared.Still_at_radisys.com>
Date: Mon, 31 Mar 2003 10:19:21 -0800
Message-ID: <F001.005766BE.20030331101921@fatcity.com>

>From MetaLink Note # 102339.1

For each session there will be a moment in time when the first sort has to be performed. At that moment, memory is allocated for performing that sort (sort area). The size of the sort area grows incrementally until sufficient memory has been allocated to perform the sort or until it reaches the maximum as specified by SORT_AREA_SIZE.

Jared

"Nelson, Allan" <anelson_at_midf.com>
Sent by: root_at_fatcity.com
03/31/2003 07:58 AM
Please respond to ORACLE-L

        To:     Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
        cc: 
        Subject:        RE: PGA

If it is a myth where do we find the truth?

Allan

-----Original Message-----
Sent: Monday, March 31, 2003 8:19 AM
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
>
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Author: Nelson, Allan
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  INET: Jared.Still_at_radisys.com

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Received on Mon Mar 31 2003 - 12:19:21 CST