What is RAC in oracle?

Answer Posted / sumit kumar

RAC stands for Real Application Clusters. It allows
multiple nodes in a clustered system to mount and open a
single database that resides on shared disk storage. Should
a single system fail (node), the database service will
still be available on the remaining nodes.

A non-RAC database is only available on a single system. If
that system fails, the database service will be down
(single point of failure).

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