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Oracle Streams
Chapter 2 - Streams Components and Processes

Table-Level User-Defined Supplemental Log Groups

SQL> ALTER TABLE ALLINSURED
ADD SUPPLEMENTAL LOG GROUP allins_polno (POL_NO, SALES_ID);

The above statement creates a log group named allins_polno on table ALLINSURED. Since the ALWAYS clause was omitted, before-images of the columns will be logged only if at least one of the columns is updated.

In user-defined supplemental log groups, a column can belong to more than one supplemental log group; however, the before-image of the columns gets logged only once.  If the same columns are specified to be logged both conditionally and unconditionally, the columns are logged unconditionally.

Staging and Propagation Process

Event propagation is the basis for the Streams methodology which does replication to other databases. Propagation of events always occurs between a source queue and a destination queue.


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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