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Oracle can propagate messages from one queue to another by providing a routing
engine for message traffic. Figure 9-7 illustrates the use of queuing and propagation.
Oracle Database 10g and more recent versions make it easier to implement Streams
programmatically, by allowing you to enqueue and dequeue batches of messages and
by reducing the amount of coding required to interact with queues.
Streams for System Interfaces
Implementing OLTP systems invariably involves interfaces with other systems in the
enterprise or in other companies. The effort to design, create, and manage these interfaces
is substantial and can easily account for 40 percent to 60 percent of the cost of
large-scale ERP implementations. Furthermore, adding other systems to the mix or
changing existing systems entails reworking the interfaces, resulting in an increasing
and ongoing burden.
Oracle Streams can help companies solve the integration problem when implementing
a ???hub-and-spoke??? architecture using a combination of messaging, routing, and
transformation technologies.


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