||Oracle Tips by Burleson
Oracle10g Grid Computing
Chapter 12 - RAC Design Considerations
This chapter focuses on the issues that must be
considered when designing for RAC. The reasons for utilizing RAC
must be well understood before a proper implementation can be
Essentially, there are only a couple of reasons
to use RAC. RAC spreads the load across multiple servers, provides
high availability, and allows larger SGA sizes than can be
accommodated by a single Oracle10g instance (for example, on
Windows 2000 or Linux implementations).
The most stringent design requirements come from
the implementation of high availability. A high availability RAC
design must have no single point of failure, a transparent
application failover, and reliability, even in the face of disaster
at the primary site. A high availability design requires attention
to equipment, software, and the network. This three-tier approach
can be quite daunting to design.
Let's look at two key design considerations. The
first is the design of the equipment needed to support a high
availability (HA) RAC configuration. Next, is the methods of
configuring RAC instances in a RAC cluster to meet performance and
HA requirements must also be considered.
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