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Oracle10g Grid Computing with RAC
Chapter 3 - High Performance and Highly Available
Database Clusters

Resource Groups

From a cluster standpoint, there are two significant aspects to this view of an application resource group as a collection of resources:

  1. If a Resource group is to run on a particular server, all of the   resources it requires must be available to the server.
     

  2. The resources comprising a resource group have interdependencies; that is, some resources (e.g., volumes) must be operational before other resources (e.g., the file system) can be made operational.

The Concept of a Virtual Server

The concept of a virtual server is a very significant feature in a failover cluster that allows smooth and seemless connectivity to clustered computing resources or services by client applications.

To users and clients, connecting to a database or service running as a clustered virtual server appears to be the same as connecting to a single, physical server. In fact, any node in the cluster, but usually the primary or surviving node, can host the connection to a virtual server. The user or client application will not know which node is actually hosting the virtual server. As shown in the Fig. 3.8, the Virtual Server is an addressing mechanism for the client connections.
 

Figure 3.8 Cluster Access by using Virtual Server


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 Oracle Consulting offers Senior Oracle consultants which are available for all areas of Oracle support.  Common Oracle consulting support activities include short-term Oracle tuning, Oracle database troubleshooting, Oracle9i and Oracle10g migration, Oracle9iAS App Server consulting, Oracle design reviews and Oracle requirements evaluation support. Oracle support and Oracle consulting services are priced by the hour, so you only pay for what you need. These one-time Oracle consulting services commonly include:

  • Answering questions from your Oracle DBA technical staff

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