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Oracle Streams
Chapter 2 - Streams Components and Processes

Conclusion

In this chapter the basic components and overall data and event flow within a typical Streams environment have been presented.

The main points of this chapter include:

  • The basic flow at the source database involves capture of database changes by scanning the redo log files and converting them into LCR events. LCR events are enqueued to a source database queue.
     

  • The Propagation process sends the events to the specified queue in the destination database.
     

  • From a destination queue, a typical Apply process or apply handler dequeues them and applies the changes to the destination database objects.
     

  • Rules play an important role in controlling the selection and transportation of the required events. Information has also been presented on the nature of row LCRs and DDL LCRs.

In the next chapter, database replication using the Streams methodology will be introduced. The main steps for a typical replication flow will be examined. The information presented will also touch upon issues such as conflict detection and session tags.


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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