Best way to monitor a concurrent request in production

Greetings all,

We have a concurrent request that hangs in production once in a while.  We end up cancelling the request and resubmitting it and it runs to successful completion.

I cannot recreate the issue in my test environment.  I have a small window in which to troubleshoot / monitor the problem concurrent request, and I would appreciate your

suggestions on how I should go about with the troubleshooting / monitoring the next time the issue arises.  My plan so far is to get the Oracle SID and AIX PID for the request.

Generate the AWR report; in AIX see if the PID is looping;