Summary
There are two main reasons for looking at RAC—high availability and scalability. As far as high availability is concerned, setting up RAC is not a trivial operation and you should think carefully about your minimum acceptable down time before introducing such a complex stack into your business. As far as scalability is concerned, you need to be aware that badly designed applications may get worse in a RAC environment because of the traffic between instances; on the other hand, a well-designed application may allow you to match your user base with the number of commodity machines you group into a cluster in a nearly linear fashion.
A core feature of the implementation of RAC is that instances need to inform each other of the objects they ...
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