Advanced Queuing - Oracle

Oracle 8.0-Style Queues
5. Check for messages in the source queue with select count(*) from where
q_name = '';
6. Check for messages in the destination queue with the same kind of select.
7. Check to see who is using job queue processes.
Is it possible that the propagation job is being starved of processing time by
other jobs?
8. Check to see that sys.aq$_prop_table_ exists in dba_queue_tables and
that queue aq$_prop_notify_ exists in dba_queues (used for
communication between job queue processes).
9. Check that the consumer attempting to dequeue a message from the destination
queue is a recipient of the propagated messages.
For 8.1-style queues, you can do the following:
select consumer_name, deq_txn_id, deq_time, deq_user_id,
propagated_msgid from aq$
where queue = '';
For 8.0-style queues, you can obtain the same information from the history
column of the queue table:
or
Oracle 8.0-Style Queues
select h.consumer, h.transaction_id, h.deq_time, h.deq_user,
h.propagated_msgid from t, table(t.history) h
where t.q_name = '';
select consumer, transaction_id, deq_time, deq_user,
propagated_msgid from
the(select cast(history as sys.aq$_dequeue_history_t)
from where q_name = '');
If you use 8.0-style queues and 8.1 or higher database compatibility, the following
features are not available:
Support for Oracle Parallel Server environments
Asynchronous notification
To use these features, you should migrate to 8.1-style or higher queues.
4-14 Oracle9i Application Developer’s Guide - Advanced Queuing