Oracle Database with the Oracle Real Application Clusters (RAC) option allows multiple instances running on different servers to access the same physical database stored on shared storage. The database spans multiple hardware systems and yet appears as a single unified database to the application. This enables the utilization of commodity hardware to reduce total cost of ownership and to provide a scalable computing environment that supports various application workloads. If additional computing capacity is needed, customers can add additional
nodes instead of replacing their existing servers. The only requirement is that servers in the cluster must run the same operating system and the same version of Oracle. They do not have to be the same model or capacity. This saves on capital expenditures allowing customers to buy servers with latest hardware configurations and use it alongside existing servers. This architecture also provides high availability as RAC instances running on different nodes provides protection from a server failure. It is important to note that (almost) all applications such as Oracle Applications, PeopleSoft, Siebel, SAP run without any changes on Oracle RAC.
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