RE: Database perfortmance degraded drastically after upgrading the database from Oracle 102.0.4 to Oracle 11.2.0.3

Not sure if you have considered this Metalink article?  

Things to Consider Before Upgrading to 11.2.0.3 to Avoid Poor Performance or Wrong Results (Doc ID 1392633.1)    

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Mandal, Ashoke
Sent: Monday, October 19, 2015 3:22 PM
To: oracle-l_at_freelists.org
Cc: oracle-l-bounce_at_freelists.org
Subject: Database perfortmance degraded drastically after upgrading the database from Oracle 102.0.4 to Oracle 11.2.0.3  

Greetings All,

After the upgrade of one of my databases from Oracle 10.2.0.4 to Oracle 11.2.0.3 the users are experiencing poor query performance. The response time of the queries have increased by 15 times.

I have tried the following without any luck but checking if you have any other suggestions

1. Changed optimizer_dynamic_sampling from 2 to 1 => No performance improvement
2. Changed optimizer_features_enable to '10.2.0.4' => No performance improvement
3. Try setting cursor_sharing to force => No performance improvement
4. Set "_optimizer_skip_scan_enabled" = FALSE => No performance improvement

Please let me know if you any suggestions to resolve this issue  

Appreciate your help in advance,
Ashoke  

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