Whitepaper

Oracle Real Application Clusters (RAC) allows Oracle Database to run any packaged or custom application, unchanged across a set of clustered servers. This provides the highest levels of availability and the most flexible scalability. If a clustered server fails, Oracle continues running on the remaining servers. When you need more processing power, simply add another server without taking users offline. To keep costs low, even the highest-end systems can be built out of standardized, commodity parts. Read on.