Trace for a Oracle Callbacks

Question

Does anyone know how to TRACE the 'sessions' that are performing the callbacks? I need to report the performance statistics and usages involved with using the PL/SQL callback.
I have tried putting the instance into trace mode (alter system set sql_trace=true) and restarting the instance but I can not find any evidence of my callback procedure being called in the resulting trace files.
Thanks
Russell

Answer 1

Thanks for the responses.
'Callback' is a term used by Oracle, within the context of AQ, for notification of automatic notification of new messages. For your education, it can either execute a PL/SQL procedure, generate an email or make a HTTP request.
I am attempting to trace on a v10.2 database, but the process for trace is typically the same across versions (excepting some old versions).
re Dan: thos sort of reply is not at all helpful, could I suggest if you do not know the subject matter then do not reply. In that way volunteers can save a lot of valuable time
According to Metalink (Note:305662.1) these processes can be traced by the following method :
QUOTE>>
1. For CPU consumption issues sql trace the QMON process in question by doing the following
Determine the pid of the qmn process (by viewing the OS processes), call it X
sqlplus "/ as sysdba"
oradebug setospid X
oradebug unlimit
oradebug Event 10046 trace name context forever, level 12
--Generate trace for 20 minutes
oradebug Event 10046 trace name context off
<< QUOTE.
Russell