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Oracle Streams
Chapter 5 -
Apply Process Configuration

Apply Process Rules

The rules defined for the Apply process dictate what is applied or what is not applied to the destination databases. Rules can be placed in a positive rule set or negative rule set. If a rule evaluates to TRUE for a change and the rule is in the positive rule set for an Apply process, the Apply process applies the change. If a rule evaluates to TRUE for a change but the rule is in the negative rule set for an Apply process, the Apply process discards the change. If an Apply process has both a positive and a negative rule set, the negative rule set is always evaluated first and acts as the first level filter.

Apply process rules for LCR events can be specified at the following three levels:

  • A Table rule applies or discards either row changes resulting from DML changes or DDL changes to a particular table. The subset rules which configure the table rules that impact the subset of the rows of a particular table can also be specified.
      

  • A Schema rule applies or discards either row changes resulting from DML changes or DDL changes to the database objects in a specified schema.
     

  • A Global rule applies or discards either all row changes resulting from DML changes or all DDL changes in the queue associated with an Apply process.

Understanding and setting up the right rule condition is very important for proper data replication flow. Otherwise, data can be ignored or not applied at all.

The following section presents information on the apply mechanism and architecture.


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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