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Oracle Database 10g: A Beginner's Guide by Michael Corey, Michael Abbey, Ian Abramson

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CRITICAL SKILL 9.6

Real Application Clusters: A Primer

When working with large databases, issues such as database availability, performance and scalability are very important. In today’s 24/7 environments, it is not usually acceptable for a database to be unavailable for any length of time—even for planned maintenance or for coping with unexpected failures. Here’s where Oracle Database 10g’s Real Application Clusters (RAC) comes in.

Originally introduced in Oracle9i and only available with the Enterprise Edition, Real Application Clusters is a feature that allows database hardware and instances to be grouped together to act as one database using a shared-disk architecture. Following is a high-level discussion on RAC’s architecture.

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