Oracle Real Application Clusters is an architecture that allows multiple instances to access a shared database. Oracle Real Application Clusters offers the following features:
Superior scalability through distribution of workload across nodes
High-availability through multiple nodes accessing the database; if one node fails, the database is still accessible through surviving nodes
Each instance is comprised of a System Global Area (SGA) and Oracle background processes. The SGA is a shared memory region that contains data and control information for an instance. Users can connect to any instance to access the information that resides within the shared database.
Oracle Net Services Configuration Overview
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