Oracle BPEL 11G performance issue

Hi
We are facing performance issues in executing our composite process in Oracle SOA 11g .
We have installed an admin server and 2 managed servers in cluster in same box. The machine utilization reached almost 95% when i started the admin server and 2 managed server (min n max size of heap given as 1GB each in start up). So i shut down one managed server and increased the JVM size of other to 2 GB and found that the heap size reaches 1.5 GB on start up (observed the heap size using Jconsole)
The machine capacity is windows server with 4 GB RAM.
Our process requries multiple records to be processed which are retrieved using Database query.
We have created 2 composites
the first composite has 2 BPEL process. the First BPEL 1 executes the DB query and retrieves the result and based on result retrieved we invoke the second BPEL2
which does around 4 DB calls and passed the result to the next composite. The final BPEL process 3 has multiple select and update query involving DB intensive process.
When we retrieve 500 records from the BPEL 1 and process , half way through we face out of memory exception. So we are using throttling but even then while executing the process of BPEL3 we are facing out of memory excetion.
Can you let me know how to find the memory space taken from heap by each BPEL process during it execution. Where in console can i get the memory used details so that i can find which BPEL sis consuming more memory and we can work on optimising.
Actually we are expecting around 1Lakh and above messages per day and need to check on how this process can handle and also how to increase or determine the capacity of the windows box.
any immediate help is highly appreciated
thanks

Always raise a case with Oracle Support for such issues.
Regards,
Anuj

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