Re: Partitionining perfortmance degraded drastically after upgrading the database from Oracle 102.0.4 to Oracle 11.2.0.3

From: Bobby Curtis <curtisbl_at_gmail.com>
Date: Fri, 9 Jan 2015 09:04:18 -0500
Message-Id: <334D320F-E82F-4A9D-938F-59B0C43B1B94_at_gmail.com>

Have you checked you execution plans to see what has changed with these queries? There were some changes with the optimizer from 10g to 11g.

Bobby Curtis, MBA
curtisbl_at_gmail.com
http://about.me/dbasolved

> On Jan 9, 2015, at 08:58, Mandal, Ashoke <ashoke.k.mandal_at_medtronic.com> wrote:
>
> Greetings All,
>
> I have upgraded one of my 2TB databases with partitioned tables & indexes from Oracle 10.2.0.4 to Oracle 11.2.0.3 recently and experiencing severe poor query performance. The response time of the queries have increased by 20-25 times.
>
> Before the upgrade to 11g
> PGA_AGGREGATE_TARGET=6GB
> SGA_TARGET=4GB
> SGA_MAX_SIZE=6GB
>
> After the upgrade to 11g
> MEMORY_TARGET=6GB
> PGA_AGGREGATE_TARGET=0
> SGA_TARGET=0
> SGA_MAX_SIZE=1GB
>
> My understanding is that if I set SGA_TARGET and PGA_AGGREGATE_TARGET parameters to 0 then Oracle manages theses as per the MEMORY_TARGET parameter in 11g.
> Q. Is it true that the SGA can't grow more than 1GB since SGA_MAX_SIZE is still set to 1GB?
> Q2. Will the performance improve by setting SGA_TARGET to 4GB by default?
> Q3. Should I also set the PGA_AGGREGATE_TARGET to GB as it was prior the upgrade?
> Q4. Any known issue of partitioning performance impact after you upgrade a 10g database to 11g?
>
> Please let me know if you any suggestions to resolve this issue
>
> Appreciate your help in advance,
> Ashoke
>
>
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Received on Fri Jan 09 2015 - 15:04:18 CET