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  Oracle Database Tips by Donald Burleson

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

Resource Coordination

Since the RAC system allows many users to connect and process database SQL operations concurrently, many resources, such as data blocks and enqueues, are used simultaneously. This situation demands an effective synchronization of the concurrent tasks.

Synchronization

Within the shared cache (global cache or fused cache of multiple instances), the coordination of concurrent tasks is called synchronization. Resources such as data blocks and enqueues are synchronized as nodes within a cluster as they acquire and release ownership. The synchronization provided by real application clusters maintains a cluster wide concurrency of resources, and in turn ensures the integrity of the shared data. Even though there is seamless and transparent synchronization of concurrent tasks within the shared cache, it does not come without a cost in overhead. Processing within the local buffer cache is always faster than processing blocks across instances.

The key to successful cluster database processing is to divide the tasks that require resources among the nodes, so that very little synchronization is necessary.
 

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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