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Oracle Tips by Burleson 

Oracle Streams
Chapter 9 -
Streams and Real Application Cluster

Capture and Apply Processes in a RAC Instance

--Link Name matches the RAC DB name, but use the TNS entry that
--  points to the Instance : DNYDBA2A

CREATE DATABASE LINK DNYDBA20.world CONNECT TO strmadm IDENTIFIED BY
strmadm USING ' DNYDBA2A.world'
/

When the DNYDBA2A fails, the queue moves over to the DNYDBA2B instance automatically. In that case, at the DNYTST10 site, the DNYDBA20.world link should be dropped and recreated with the same name but with the TNS entry that points to the DNYDBA2B instance. Recreate the database link as shown below:

CREATE DATABASE LINK DNYDBA20.world CONNECT TO strmadm IDENTIFIED BY strmadm USING 'DNYDBA2B.world'
/

Since the database link name is not changed, the propagation process attributes, if any at the DNYTST10 site, remain the same.

At the same time, for the RAC database DNYDBA20 to propagate to the DNYTST10, there is no need for any change in the configuration. Once the queue moves over to the DNYDBA2B instance, the propagation also moves over and resumes the replication to the destination of DNYTST10.

The following output shows the failover of queue buffers. It shows that the RAC database has two instances and the NY1_QUEUE_TABLE is currently on Instance-1, which is DNYDNA2A.


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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