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Oracle Real Application Clusters (Oracle RAC), an Oracle Database option product, can run packaged or custom applications unchanged in a cluster of low-cost servers.
Industry-Leading Scalability and Non-Stop Availability
Oracle RAC runs applications faster than the fastest mainframe. And if a server fails, the mainframe stops while Oracle RAC just keeps running. When you need more processing power, simply add another server without taking users offline.
Today, businesses are putting IT organizations under tremendous pressure to deliver the highest quality of service, in terms of maximum availability and scalability, at the lowest possible cost, and at the highest level of efficiency and flexibility. In short, IT is being asked to do much, much more with much, much less.
Enterprise Grids make these seemly impossible challenges achievable. Enterprise Grids, made up of large configurations of very low cost, commodity clusters, dramatically reduce the cost of computer hardware. Oracle RAC technology enables this low-cost hardware platform to deliver the highest quality of service that rivals and exceeds the levels of availability and scalability achieved by the most expensive, mainframe SMP computers. By dramatically reducing administration costs and providing new levels of administration flexibility, Oracle is enabling the enterprise Grid environment.
What is RAC?
Oracle RAC enables the Oracle Database to run real applications on clusters. By real applications we mean that RAC supports mainstream business applications of all kinds. This includes popular packaged products as well as in-house developed applications. It includes both OLTP and DSS. And, it includes Oracle’s unique ability to effectively support mixed OLTP/DSS environments. Oracle is the only open systems database with this capability.
Oracle RAC enables enterprise Grids. These are the data centers of the future. Enterprise Grids are built out of large configurations of standardized, commodity-priced components: processors, network, and storage. Oracle RAC’s cache fusion technology provides the highest levels of availability and scalability. Oracle Database 10g and Oracle RAC 10g dramatically reduce operational costs and provide new levels of flexibility so that systems become more adaptive, proactive, and agile. Dynamic provisioning of nodes, storage, CPUs, and memory allow service levels to be easily and efficiently maintained while lowering cost still further through improved utilization. Visit Oracle for more information about RAC 
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