How to ascertain dequeue is over

Hi
In AQ , once i enqueue a message to a queue from which it is propogated to another queue (subscriber queue) . How can the publisher of the message ascertain that the message was succesfully dequeued by the subscribers. Do the subsribers have to respond back with an acknowledgement manually by enqueuing another message say successfully dequeued or does this happen
automatically once the message is dequeued by the consumer i.e does oracle take care of it by some internal mechanism
Regards
Sushant

Hi,
Oracle takes care that the messages are sent successfully to the receiver. There is an elaborate algorithm which takes care of this.
If in case, the message is not sent even after this, then database will log the message in the Exception Queue. You can check this queue for any error messages.
Hope this helps.

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