Foreword
Oracle Real Application Clusters (RAC) is the best-selling Oracle Database option, and has been since its introduction in 2001. Why has this option been so successful? Because it provides clear value to companies—value that has evolved over time as their IT environments have evolved.
Take a look at the data center in the post-mainframe era. Traditionally, IT has built dedicated silos of hardware and software for each application. This made it easy to provide predictable service levels, unless of course there were wild peaks in load. However, it also meant over-provisioning hardware and software to meet peak demand. It was difficult to scale as the application demand grew, often requiring forklift updates and the associated downtime. ...
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