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When messages are propagated between queues, messages that were enqueued explicitly into a source queue can be dequeued explicitly from a destination queue by a messaging client or user application. These messages can also be processed by an apply process. Figure 1-6 shows explicit enqueue of messages into a source queue, propagation to a destination queue, and then explicit dequeue of messages from the destination queue.
An application can construct and enqueue LCRs into an ANYDATA queue. Row LCRs describe the results of DML changes, and DDL LCRs describe DDL changes. Typically, LCRs are consumed by apply processes, but they can also be consumed by messaging clients and applications. Heterogeneous replication environment can use explicit enqueue of LCRs to replicate database changes from a non-Oracle database to an Oracle database.
User applications can enqueue messages into a queue explicitly. The user applications can format these messages as LCRs or user messages, and an apply process, a messaging client, or a user application can consume these messages. Messages that were enqueued explicitly can be propagated to another queue or explicitly dequeued from the same queue. Figure 1-5 shows explicit enqueue of messages into and dequeue of messages from the same queue.
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