What is Oracle Real Application Cluster ( RAC ) - Bangalore

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Oracle Real Application Clusters RAC
Oracle Real Application Clusters is an option to the Oracle Database Enterprise Edition that was first introduced with Oracle 9i. Oracle Real Application Clusters is now proven technology used by thousands of customers in every industry for every type of application. Oracle RAC provides options for scaling applications beyond the capabilities of a single server. This allows customers to take advantage of lower cost commodity hardware to reduce their total cost of ownership and provide a scaleable computing environment that supports their application workload. Oracle RAC enables the Oracle Database to run mainstream business applications of all kinds on server pools including popular packaged products (such as Oracle Applications, Peoplesoft, SAP), in-house developed applications, which can be either OLTP, DSS, or a mixed workload. Oracle Real Application Clusters is a key component of Oracle’s Maximum Availability Architecture (MAA)1 , which provides direction to architect the highest availability for applications. Oracle RAC provides the ability to remove the server as a single point of failure in any database application environment.

Oracle Real Application Clusters Architecture

An Oracle RAC database is a clustered database. A cluster can be described as a pool of independent servers that cooperate as a single system. Server Pools provide improved fault resilience and modular incremental system growth over single symmetric multi-processor (SMP) systems. In the event of a system failure, clustering ensures high availability to users. Access to mission critical data is not lost. Redundant hardware components, such as additional servers, network connections, and disks, allow the cluster to provide high availability. Such redundant hardware architectures avoid a single point-of-failure and provide exceptional fault resilience.

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