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

Failover Process


As we noticed in the above examples, the database instance has been freshly started after required resources are online. It is a mutually exclusive condition in which the database instance resides on a primary node or on a backup node.

Failover Cluster Architecture

Normally the Fail-Over cluster is implemented in two types of architectures. They are Active/Passive architecture and Active/Active architecture.

Active/Passive Clusters – This type comprises two near identical infrastructures, logically sitting side-by-side. One node hosts the database service or application, while the other rests idly waiting in case the primary system goes down. They share a storage component, and the primary server gracefully turns over control of the storage to the other server or node when it fails. On failure of the primary node, the inactive node becomes the primary and hosts the database or application.

Active/Active Clusters – In this type, one node acts as primary to a database instance and another one acting as secondary node for fail over purpose. At the same time, the secondary node acts as primary for another instance and the primary node act as the backup/secondary node.

Fig. 3.9 shows an example of active / active architecture.


Figure 3.9 Two Node Cluster with Active /Active Resource groups

For more information, see the book Oracle 11g Grid and Real Application Clusters 30% off if you buy it directly from Rampant TechPress . 

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