Description of the illustration xstrm085.eps

This illustration shows a sample XStream Out configuration that can be configured using the ADD_OUTBOUND procedure. The illustration shows a client application and the following three Oracle CDBs:

• The source database contains a redo log that records the changes for the hr schema, the oe.orders table, and the oe.order_items table.

• The capture database can be the source database, the outbound server database, or a third database. The capture database contains the following components:

  • A capture process capturing changes from the redo log of the source database. If the capture database and the source database are the same, then a local capture process captures changes in the redo log at the source database. If the capture database is the destination database or a third database, then the source database redo log is shipped to the capture database, and a downstream capture process captures changes in this redo log.

  • The capture process converts the changes to logical change records (LCRs) and enqueues the LCRs.

  • If the capture database and the outbound server database are different databases, then a propagation propagates the LCRs to a queue at the outbound server database. If the capture database and outbound server database are the same, then the propagation is not needed.

• The outbound server database contains the following:

  • The queue that contains LCRs that were captured by the capture process.

  • An outbound server named xout that dequeues LCRs from the queue. The client application receives the dequeued LCRs.