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Oracle Streams
Chapter 2 - Streams Components and Processes

Rule Based Transformations

During the Apply process, it is also possible to modify certain attributes of the event and the data being applied. This is possible by employing the rule-based transformations. A rule-based transformation can, for example, modify the data type of a particular column in a table for an event. Thus, a rule-based transformation is any modification to an event that results when a rule in a positive set evaluates to TRUE.

Transformation can be configured at various levels in the Streams flow. They are as follows:

  • During the enqueue of an event by the Capture process, the event can be formatted to make it appropriate for the destination database.
     

  • When the events are propagated to a destination database queue, filtering can be introduced that will reduce the network traffic and increase the performance levels.
     

  • When the events are dequeued by an Apply process or messaging clients, events can be modified to make them compatible with destination 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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