If it's database wide, check AWR reports.
Look out in particular for adaptive direct path reads.
Sent from my Windows Phone
________________________________
From: Mandal, Ashoke<mailto:ashoke.k.mandal@xxxxxxxxxxxxx>
Sent: 19/10/2015 20:23
To: oracle-l@xxxxxxxxxxxxx<mailto:oracle-l@xxxxxxxxxxxxx>
Cc: oracle-l-bounce@xxxxxxxxxxxxx<mailto:oracle-l-bounce@xxxxxxxxxxxxx>
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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