Performance Degradation of HR Disco reports after upgrade from 1158 - 11510

Hi there
Has anyone else seen a degradation in performance between 4i and 10.1.2 on apps HR modules? Or indeed not against HR modules.
Following an upgrade from 1158 to 11510 we have seen significant downturn in performance of long standing HR reports. We are using Discoverer desktop in both cases and have a query that is scheduled overnight and usually completed in 2 hours using 4i against the 1158. Now it's taking more like 15 or more using discoverer 10.1.2 against the 11510 environment. We have tested using 4i against 11510 environment and this performs fine, in fact better than it used to in 1158, so it looks like Discoverer 1012 is causing the downturn in performance.
Anyone got anything to share on this??
Cheers, Kate
Message was edited by:
kaubon

Kaubon,
There is a difference between oracle 9i and 10g database.
If you are using optimizer_features_enable="9.2.0.8" to revert back to the old behavior then you are not utilizing the updated feature of 10g. You are making 10g to follow 9i behavior.
It is just like buying a new car and damaging it to get the feel of your old car.
We had the similar problem, but we fine tune all our queries according to 10g. Main problem was use of rules. You need to either remove those rules or modify those rules.
There are few good documents of 10g performance on metalink. You can refer to that.
All the best.
Soham khot
http://oracleappshr.blogspot.com

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OS Version: Mac OS X 10.5 (9A581)
Report Version: 6
Exception Type: EXCBADACCESS (SIGBUS)
Exception Codes: KERNPROTECTIONFAILURE at 0x0000000000000004
Crashed Thread: 1

Performance Degradation of HR Disco reports after upgrade from 1158 - 11510

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