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Oracle10g Grid Computing with RAC
Chapter 3 - High Performance and Highly Available
Database Clusters

Shared-Nothing Model

In Shared-Nothing model, also termed as Data-Partitioning Model, each system owns a portion of the database and each partition can only be read or modified by the owning system. [Fig. 3.10] Data Partitioning enables each system to locally cache its portion of the database in processor memory without requiring cross-system communication to provide data access concurrency and coherency controls.

Each server in the cluster has its own independent subset of the data (a partition) it can work on independently without encountering resource contention from other servers. The clustered nodes communicate by passing messages through a network that interconnects the servers. Client requests are automatically routed to the system that owns the particular resource (for example, memory or disk). Only one of the clustered systems can "own" and access a particular resource at a time. In the event of a failure, resource ownership can be dynamically transferred to another system in the cluster.

Figure 3.10 Shared Nothing Mode – Three Node database cluster

This architecture has several advantages:

  • Shared nothing systems provide for incremental growth.

  • Good for read-only databases and decision support applications.

  • Failure is local - if one node fails, the other nodes stay up. However, disk system of failed node moves over to the surviving node.

For more information, see the book Oracle 11g Grid and Real Application Clusters 30% off if you buy it directly from Rampant TechPress . 

Written by top Oracle experts, this RAC book has a complete online code depot with ready to use RAC scripts.

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Burleson Oracle Consulting offers Senior Oracle consultants which are available for all areas of Oracle support.  Common Oracle consulting support activities include short-term Oracle tuning, Oracle database troubleshooting, Oracle9i and Oracle10g migration, Oracle9iAS App Server consulting, Oracle design reviews and Oracle requirements evaluation support. Oracle support and Oracle consulting services are priced by the hour, so you only pay for what you need. These one-time Oracle consulting services commonly include:

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