Oracle Advanced Queuing
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In computing, Oracle Advanced Queuing (AQ) comprises a species of message-oriented middleware developed by Oracle Corporation and integrated into its Oracle database.
AQ uses database structures as a repository for asynchronous queuing as an element in various Oracle-oriented and heterogeneous operations. Oracle features utilising Advanced Queuing include:
In Oracle Data Guard primary databases the queue monitor process (often running as qmn0) interacts with AQ.
As of Oracle release 9.2, AQ comes bundled with Standard Edition and Enterprise Edition at no extra cost.