About Change Propagation Between Databases

A propagation sends messages from one queue to another. You can use Oracle Streams to configure message propagation between two queues in the same database or in different databases. Oracle Streams uses a database link and Oracle Scheduler jobs to send messages. A propagation is always between a source queue and a destination queue. In an Oracle Streams replication environment, a propagation typically sends messages that describe database changes (in the form of LCRs) from a source queue in the local database to a destination queue in a remote database.

Figure: Propagation shows a propagation.