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.
Oracle AQ is used as the internal Java Message Service provider in the Oracle Enterprise Service Bus.
In addition to asynchronous message exchanges (point-to-point and publish–subscribe), Oracle AQ can also perform message transformation via SQL functions.