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Pro Ora cle Database 10g RAC on Linux Installation, Administration, and Performance by Steve Shaw, Julian Dyke

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Chapter 22. RAC Internals

In this chapter, we will explore some of the internal mechanisms that are used to implement RAC databases. These mechanisms differentiate RAC from single-instance databases. It is important to understand the underlying behavior of RAC when you are designing high-capacity systems and addressing performance issues.

A RAC cluster consists of a single database and multiple instances. Each instance has a System Global Area (SGA) containing the same structures as a single-instance SGA, including the fixed and variable memory areas, buffer cache, and log buffer. Each instance has access to the shared database and can potentially read or update any block. Therefore, you need to coordinate block access between the instances in ...

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