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Oracle Streams
Chapter 3 - Streams Replication

Why use Down Streams Capture?

Down Streams Database Capture is a useful feature because the Capture process is shifted from the primary database. There is no utilization of additional resources in terms of process activity and memory resources on the source database. This way there is no overhead on the source database. Entire capture and enqueue activities are executed on the downstream database.

If multiple source databases are participating in the replication process, Capture processes for all of these multiple database sources can be centralized on a single database, the downstream database, for administrative convenience.

Since copying the redo log files to the downstream databases is an essential step, it provides improved protection against data loss. For example, the redo log files at the downstream database may be used for recovery of the source database in some situations.

The ability to configure multiple Capture processes at the downstream database provides more flexibility and improves scalability. Additional memory resources can be assigned without affecting the SGA of the source database.


The above text is an excerpt from:

Oracle Streams
High Speed Replication and Data Sharing

ISBN 0-9745993-5-2

by Madhu Tumma
 


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