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ORA-24018

By Dinesh
STOP_QUEUE on string failed, outstanding transactions found
cause:-There were outstanding transactions on the queue, and WAIT was set to false, so STOP_QUEUE was unsucessful in stopping the queue.
action:-1). Set WAIT to TRUE and try STOP_QUEUE again. It will hang till all outstanding transactions are completed.

2). If you want to stop the queue at once just kill the session using the queue table, and then stop the queue.For this you can take refernce:-
kill session
stop queue

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