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Benefits of RAC in large systems environment

In a large systems environment where multiple CPUs and memory are dynamically available to be deployed for a database server, what are the benefits of a RAC implementation?

In a large systems environment where multiple CPUs and memory are dynamically available to be deployed for a database server, what are the benefits of a RAC implementation? Obviously no single point of failure is eliminated but how else is performance improved?
RAC in and of itself does not give you better performance against a single machine. Assuming you do not have a system that maxes out the box limitations you could always scale a single box up to match or beat the performance of scaling out. The benefits of RAC are that it is usually cheaper to scale out vs. up, you do not run into hardware limitations as quickly (though there are max node limitations by platform) and, as you noted, you gain the additional assurance of increased availability protection, and often transparently.

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