ORA-24012: cannot drop QUEUE_TABLE, some queues in string have not been dropped Cause: A queue exists in thequeue table which has not been dropped. All queues
need to be dropped first. Action: Drop all queuesbelonging to this queue table using the drop_queue()
command. Be sure to stop the queues appropriately before dropping them.
Alternately, use the force option in drop_queuetable.