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Donald K. Burleson

Oracle RAC Tips

Why Clusters?

Symmetric multiprocessors (SMP) and non-uniform memory access (NUMA) systems have grown in size and power. It is very common to see SMP or NUMA systems equipped with 8 to 64 processors. They present an alternative to cluster systems, but clusters have remained competitive and have made inroads into commercial application environments. There are obvious reasons for the survival of clusters: [Pfister]

  • Performance - Throughput, response time, and turn around time is improved by using several machines at the same time. Clusters generate higher levels of performance
  • Availability - Clusters provide uninterrupted service by redistributing work, or through shifting the application services to surviving nodes by way of a failover process.
  • Price/Performance - Clusters or other forms of computer aggregations are typically collections of machines that individually have very good performance for their price.
  • Incremental growth - It is easier to justify adding to a cluster than to buy a whole new computing facility.
  • Scaling - Clusters have the ability to add capacity as needed.
  • Manageability - Clusters have the ability to be managed as a single system.

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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