From Oracle FAQ
A queue is a first-in first-out data structure. Objects are added (enqueued) to the tail of the queue and taken off the head (dequeued).
Queues are used to process multiple demands for a resource such as a printer, processor or communications channel (deferred execution of work). Queues also serve as foundation technology for workflow applications.
Queue Tables can be created on an Oracle database with Oracle's Advanced Queueing feature.
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