![]() ![]() Both procedures allow control of enqueuing and dequeuing separately. Queues need to be started after creation via START_QUEUE. Single-consumer queues have the simplest underlying structure and, when used appropriately, typically offer the highest performance. However, multiple consumers may dequeue from the queue (e.g., multiple instance of an application, such a multiple instances of a fulfillment application processing messages from a single order queue). In a single consumer queue, a given message is dequeued by only one consumer, after which it is removed from the queue. All queues allow any application with appropriate permissions to enqueue messages. A multiconsumer queue may provide both multicast and broadcast capabilities. Oracle AQ provides the three types of messaging described above via two basic types of queues: single-consumer queues and multiconsumer queues. In addition, Oracle AQ also provides the ability to browse messages without dequeuing. ![]() Oracle AQ provides all of this functionality.
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