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  Oracle Database Tips by Donald Burleson

Oracle10g Grid Computing with RAC
Chapter 7 - Cache Fusion and Inter Instance Coordination

Benefits of Cache Fusion

As a result, very high scalability of database performance can be achieved simply by adding nodes to the cluster. RAC also enables better database capacity planning and conserves capital investment by consolidating many databases on a single large database, thus reducing administrative overhead.

Another advantage realized with cache fusion technology is that applications no longer need to be partitioned according to data access patterns. This was necessary in earlier versions of Oracle parallel databases in order to avoid or reduce data-block pinging. A scalable application on a single-node Oracle server will be just as flexible on a multi-node RAC, even in different workload situations.

However, scalability performance may be better with a workload of minimal cross-instance block transfers (OLTP operations) compared to a workload of large cross-instance block transfers. Where there is a large cross-instance transfer of resources, there is a certain overhead due to lock conversions and block transfers from one cache to another.

The advantage of improved load balancing can be used to leverage application performance. User connections can randomly access any instance in the cluster. Depending on the node capacity, instances can be balanced effectively. Contention for server resources, such as the CPU and memory, is reduced.

The above text is an excerpt from:

Oracle 10g Grid & Real Application Clusters
Oracle 10g Grid Computing with RAC
 ISBN 0-9744355-4-6

by Mike Ault, Madhu Tumma

 

   
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