V$AQ

This view describes statistics for the queues in the database.

Column	Datatype	Description
QID	NUMBER	The unique queue identifier
WAITING	NUMBER	Number of messages in the queue in the state 'WAITING'
READY	NUMBER	Number of messages in the queue in the state 'READY'
EXPIRED	NUMBER	Number of messages in the queue the state 'EXPIRED'
TOTAL_WAIT	NUMBER	Total wait time of all 'READY' messages in the queue
AVERAGE_WAIT	NUMBER	Average wait time of 'READY' messages in the queue