Database - RAC/Scalability (MOSC)

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2-instances on a 3-node cluster for active/passive using active_instance_count

edited Jul 15, 2009 8:13AM in Database - RAC/Scalability (MOSC) 6 commentsAnswered
 hi,

A product we have purchased requires the following for a RAC environment:

Oracle RAC (Real Application Cluster) is supported in a two-node active-passive configuration. That is, a configuration where the active_instance_count parameter is set to 1. Used in conjunction with connection failover for the JDBC TM driver, this configuration provides failover capability for the repository.

From Oracle documentation i read the following:

Note:

This parameter functions only in a cluster with only two instances.

ACTIVE_INSTANCE_COUNT enables you to designate one instance in a two-instance cluster as the primary instance and the other instance as the secondary instance. This parameter has no functionality in a cluster with more than two instances.

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