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Donald K. Burleson

Oracle RAC Tips

Fault-Tolerant systems

Another important distinction we need to make is between a high availability (HA) system and a fault tolerant (FT) system. Fault tolerant systems offer higher levels of resilience and recovery. They use a high degree of hardware redundancy and specialized software to provide near-instantaneous recovery from any single hardware or software unit failure.

This technology is relatively expensive and requires allocating higher budgets. Fault tolerant servers are primarily used for applications that support high-value, high-rate transactions, such as check clearinghouses, automated teller machines, or stock exchanges. Clustered systems are more often characterized by high availability and scalable solutions. HA Clusters may not guarantee non-stop operation, but provide availability sufficient for most mission-critical business applications.

For more information, see the book Oracle Grid and Real Application Clusters 30% off if you buy it directly from Rampant TechPress . 

Written by top Oracle experts, this RAC book has a complete online code depot with ready to use RAC scripts.  


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