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Oracle10g Grid Computing with RAC
Chapter 12 - RAC Design Considerations

Failure of the Application Server

The application server usually serves the web pages, reports, forms, or other interfaces to the users of the system. If there is only a single application server and it goes down, even if the database is fully functional, there is no application to run against it. A failed application server without redundancy means no one can use the database, even if all other components are still functional. This also applies to single web cache servers or OC4J servers.

Failure of the Database Server

The failure of the database server is the one failure that is taken care of in a normal RAC configuration. Failure of a single database server leads to failover of the connections to the surviving node. While not a critical failure that will result in loss of the system, a single server failure means a reduction in performance and capacity. Of course, a catastrophic failure of both servers will result in total loss of service.

Note that the servers will have disk controllers or interfaces that connect through the switches to the SAN arrays. These controllers or interfaces should also be made redundant and have multiple channels per controller or interface. In addition, multiple network interface cards (NICs) should also be redundant, with at least a single spare to take the place of either the network connection card or the cluster interconnect should a failure occur. 

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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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.

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