Oracle Real Application Clusters, or simply RAC, is a value-added option to the Oracle Database that provides the installation of a single database across multiple interconnected servers with high availability, scalability, and fault tolerance. Therefore, Oracle RAC becomes a choice for those enterprises with mission-critical data and transaction needs. Through Oracle RAC, multiple computers running Oracle RDBMS software have the facility to access the same database simultaneously. This ensures that when one or more servers within the system fail, the system continues to run. This distribution of workload across all nodes in the cluster manages huge extents of data and transactions efficiently.

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