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Oracle10g Grid Computing with RAC
Chapter 12 - RAC Design Considerations

Designing Equipment for Real Application Clusters

By having Oracle10gAS Web Cache Cluster and load balancers in front of the OC4J clusters, performance, scalability, and availability of a web site are increased. Web Cache eliminates the need to repeatedly process requests on the application web server by storing frequently accessed URLs in memory.  Multiple instances of Web Cache can be configured to run as members of a cache cluster. This provides:

  • Higher scalability of the website - by allowing more content to be cached and more client connections.

  • Higher availability - by detecting failures and failing over of caches. 

Because each OC4J instance and cache cluster member is redundant on multiple sets of machines, problems and outages within a site are transparent to the client.  The OPMN monitoring infrastructure ensures near uninterrupted availability of an application’s services by automatically detecting and restarting failed components of the application tier or the Web Cache.

Notice that in Figure 13.2 the use of a RAC server platform capable of CPU partitioning is shown. This means that multiple CPUs, in systems like the E6800 from SUN, can be separated into virtual servers that act like independent servers. This partitions malfunctioning CPUs or memory (which is on the CPU cards in the E6800), and the rest of the server continues to work.

For more information, see the book Oracle 11g 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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Burleson Consulting can offer world-class remote Oracle database support at super-affordable prices.

Our remote Oracle DBA service provides 100% of the remote Oracle database administration needs for your company, and includes 24x7 access to our staff of 100% OCP Certified Oracle DBAs. 

We require a 12 month service commitment and include the following services:

  • Initial configuration review and problem identification
  • Installation of Oracle statistics collection mechanisms and quarterly database growth summaries
  • Hourly monitoring of your Oracle database for pending problems
  • Periodic performance analysis & identification of tuning activities
  • Twenty Four hour Oracle emergency support
  • Reporting and resolving all serious Oracle alert log messages
  • Free use of the BC TablePack, ServerPack and AuditPack services
  • Quick response emergency support for production database outages
  • Four hours of free remote DBA support every month. You can use these free hours for any DBA activity, including database analysis, system design, production migrations or personal mentoring.

For more information, please visit


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