Oracle RAC

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Oracle Real Application Clusters or, Oracle RAC provides high availability and clustering software in Oracle Database computing. It was developed by Oracle Corporation in the year 2001 along with Oracle9i.

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Functionality Of RAC - It supports clustering by running Oracle RDBMS software concurrently on multiple computers which acquire the same database. Non-RAC database environment allows single instance(consists of memory related with Oracle and processes of an Operating System) to access only single database. But in an Oracle RAC background more than one computer along with instances can access single database simultaneously.

Implementation of RAC - For the coordination among several servers and the sharing of their data storage, Oracle RAC is dependant on Oracle Clusterware, which is an infrastucture constituent. Since every computer under RAC can access the single database, the coordination of data change (if any query is received) among computers promises the consistency on every computer. This functionality is known as Cache Fusion because physically individual memories of different computers are fused into globally single cache. 

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