As an example, an application may be built to automatically inform a
subscriber when a shipment occurs to certain highly valued customers; the subscriber
would then know that she should begin to track the shipment??™s progress and
alert the customer that it is in transit.
Oracle Database 11g includes several enhancements to Oracle??™s messaging server
that increase the performance and reliability of the server.
Oracle Streams
Oracle9i Release 2 introduced Oracle Streams, which folded the capabilities of
Advanced Replication and Advanced Queuing into a single product family and
added a method of sharing data and events within a database or between databases.
Streams enable the propagation of changes via a capture-and-apply process, including
Oracle??™s change data capture. Changes can be propagated between Oracle
instances, from Oracle instances to non-Oracle instances (via Transparent
Gateways), and from non-Oracle databases to Oracle (via messaging gateways in
combination with custom code on the non-Oracle source to collect changes).
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