The QMON processes are optional background processes used by Oracle Streams Advanced Queueing (AQ), Streams and a variety of other Database products which monitor and maintain all the system and user-owned AQ persistent and buffered objects. These optional processes, like the job_queue processes, do not cause the instance to fail on process failure. They provide the mechanism for message expiration, retry, and delay, maintaining queue statistics, removing processed messages from the queue table and maintaining the dequeue IOT. They also handle all the supported buffered message operations.
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