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Real Application Clusters (RAC) offer two distinct
advantages, scalability and availability. With RAC,
you can scale your solution quite nicely by
distributing your database load among several servers.
With RAC, you also get a highly available solution. If
one database server goes down, clients can be
configured to automatically fail over to a server that
is still up and running. Most people who employ RAC
are looking for one or both of these advantages. The
biggest disadvantages to RAC are cost and complexity.
RAC can cost more since you have to license Oracle on
more servers and pay for the RAC software. And RAC is
more complex than a single database server.
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