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

The Concept of a Virtual Server

Server clusters manage the virtual server as a resource that is mapped to the IP address or network name. Application client connections to a virtual server are made by a client session that knows only the IP address that the cluster service publishes as the address of the virtual server. The client view is simply a view of individual network names and IP addresses.

For example, in a typical database cluster having two physical nodes, each with distinct IP addresses, the cluster server configures an additional IP address, usually termed as virtual server or host. This virtual host always maps to the active node in the cluster where database service is provided.

Failover Process

Whenever there is a failure in the primary node, and the application or database is in disabled function, the failover process begins as initiated by a script or agent. Fail-over in host-based database system usually includes the following steps in sequential order.

  • Detecting failure by monitoring the heartbeat and checking the status of resources.
     

  • Reorganizing cluster membership in the Cluster Manager.
     

  • Transferring disk ownership from the primary node to a secondary node.
     

  • Mount the file system on secondary node.
     

  • Starting database instance on secondary node.
     

  • Recover the database and rollback uncommitted data.
     

  • Reestablishing client connections to the fail over node (database)

Let us look at some examples of how a typical resource group is configured in a Veritas Cluster server and Microsoft Cluster service.


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:

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