Best practice tunning parameters for tunning ADF apps?

Hi all,
I am tuning our 11g ADF app for around 3 billions (can be up to 10 billions records) and the concurrent connections up to 100. The app is running on a 16 core Intel chip and 8GB of RAM. The Weblogic used Rockit JDK. Any one have this experience please share and help me! I am considering what is the top ten crucial parameters for this tuning. Up to now I just have tunned some parameters from OS layer to app layers:
- indexing for queries
- open cursors, processes and pga memory
- share pool for app module and jdbc pooling.
- heap size of JVM memory only max value 1024 because of 32 bit Windows (Perhaps I must upgrade to 64 bit OSs to use more memory)
The app was tested with Jmeter with only 10 concurrent connection and the test case is logging in and query and logging out. It ran very slow. I found out that the weblogic server did not use CPUs equally (only 1-2 CPus were used)
Thank you and best regards.
Elton Son.

Hi,
maybe this of interest:
http://download.oracle.com/docs/cd/E12839_01/web.1111/e13814/toc.htm
http://download.oracle.com/docs/cd/E15523_01/core.1111/e10108/adf.htm#CIHHGADG
http://www.oracle.com/technetwork/articles/systems-hardware-architecture/tuning-adf-t-series-168445.pdf
http://andrejusb.blogspot.com/2009/08/oracle-adf-tuning-preventing-sql-query.html
Frank

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