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Oracle Streams
Chapter 3 - Streams Replication

Database Link

As noted earlier, Data Replication is the main beneficiary of the Streams methodology. Streams based replication is a simple and yet flexible method that can be used to move data across the database systems. In the next section, the basic replication functionality and the related components of Streams replication will be presented.

Streams Replication Components

Data replication involves the setting up of data replicas at the remote database site. Replication can be set up at the table level, the schema level and even at the database level.

Types of Changes for Replication

When a Capture process is configured for replication purposes, database changes made by the following types of DML are extracted:

  • INSERT
     

  • UPDATE
     

  • DELETE
     

  • MERGE
     

  • Piecewise updates to LOBs

In case of MERGE, the Capture process converts each MERGE change translated into either an INSERT or UPDATE change. MERGE is not a valid command type in a row LCR.

A Capture process does not capture CALL, EXPLAIN PLAN, or LOCK TABLE statements. Since these SQL statements have no bearing on data rows, they are not relevant to the Capture process. At the same time, the DML changes made to a temporary table are also not captured by the Capture process either. This is because the DML activities on a temporary table are merely staging operations and the rows are lost the moment the session is finished.


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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