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  Oracle Tips by Burleson

Designing Equipment for Real Application Clusters

It is critical to ensure that there is no single point of failure in a high availability configuration. Figure 13.2 illustrates exactly what eliminating single points of failure means.

Figure 13.2: Example of a Redundant RAC Configuration

In Figure 13.2, the following redundancies have been added:

  • A second firewall with an independent connection to the web.

  • A second application server.

  • A second fabric switch with redundant pathways.

  • A second SAN array.

  • A set of load balancers.

  • A geo-remote RAC Guard configuration.

Now, the single points of failure in Figure 13.1 have been eliminated. A third server has also been added, as well as a SAN array in a geographically remote location. This third server and SAN ensure that not even a disaster at the primary location will bring the application down. (Not shown is the application server and firewall for this third server. It may not be required if the firewalls and application servers are in a different location from the database servers.)

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.

Remote DBA Services

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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