A cluster configuration policy is a document that contains exactly one definition for each server pool managed by the cluster configuration policy set. A cluster configuration policy set is a document that defines the names of all server pools configured for the cluster and definitions for all policies.
Note:
Oracle Clusterware 11g release 2 (11.2) supports only a single server pool configuration. You must manually make any changes to the server pool configuration when you want the change to take effect.
In Oracle Clusterware 12c, you use the policies defined in the cluster configuration policy set for server pool specification and management, and Oracle Clusterware manages the server pools according to the policies in the policy set. With a cluster configuration policy set, for example, you can allocate more servers to OLTP workload during weekly business hours to respond to email demand, and on the weekends and evenings, allocate more servers to batch workloads, and perform transitions of server pool configuration or server allocation, atomically.
At any point in time, only one policy is in effect for the cluster. But you can create several different policies, so that you can configure pools of servers with parameters to reflect differences in requirements for the cluster based on business needs or demand, or based on calendar dates or times of the day.
See Also:
"An Example Policy Set Configuration" for a more detailed example of policy set configuration