Changing the Database driver causing performance issue

Hello Experts
I am finding a strange issue where if I change the database to Oracle 11g ( you will find it if you click the database which you have created in physical layer) under Data Source definition the report takes a longer time to complete.
Actually I have upgraded the 10g rpd and catlog to 11g but database under data source definition was still using - oracle 10gR1 ( i donno whether this is a driver or not) . Everthing was running perfectly fine until I change the database under data source definition to Oracle 11g , the report takes a longer time . Also I found that the query is changed when I changed the database under data source definition to 11g.
Also to inform you that datawarehouse is Database 11g where the data lies.
what is the significance of Data source definition as changing it is changing the whole query.
Pls. help.

Hello,
Do you have the Full Oracle 11g DB Client installed on the same box where you are running your BI Server .? Also can you make sure you have copy of tnsnames.ora in following directories.
1. C:\Middleware\Oracle_BI1 \network\admin directory
2. C:\Middleware\oracle_common\network\admin
Check if the SQL Features that the datasource has , sometimes when you disable SQL features the server could issue a less effcient query to the database.
Thanks,
-SVS

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