Message will be enqueued in OAQ by some process. Need to pick this message from that Queue whenever message is dropped. Will DBMS SCHEDULER package help in picking up this message. Cannot specify the interaval in that package. If not how can we pick the message?
No need for dbms_scheduler. Just google for plsql callback (or callbacks generally) and the dbms_aq.register procedure. That should be all you need. Essentially creates a trigger on the queue.