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Oracle 11g R1/R2 Real Application Clusters Essentials by Syed Jaffer Hussain, Ben Prusinski

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Fault-tolerant systems and high availability

Fault tolerance is data center technology that enables a system to continue to function correctly in the face of a failure with one or more faults within any given key component of the system architecture or data center. If operating quality experiences major degradation, the decrease in functionality of the environment is usually in direct proportion to the severity of the failure, whereas a poorly designed system will completely fail and breakdown with a small failure. In other words, fault tolerance gives you that added layer of protection and support to avoid a total meltdown of your mission-critical data center and, in our case, Oracle servers and database systems. Fault tolerance is often associated ...

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