RAC Policy managed database tips

Oracle Database Tips by Donald BurlesonMay 8, 2015

Question: I see in the RAC documentation that there are two types of RAC services, policy-managed services and admin managed services. What is a policy-managed service and when would I use a policy-managed server pool?

Answer: The svrctl commands and OEM allows you to define a service as a policy-based or admin-based.

A Policy-Managed Database is a database that you define as a cluster resource.

Also see these notes on Oracle server pools.

This is the add-a-node, steal-a-node feature prominent in the Grid marketing brochures for Grid scalability. A bank of policy-managed databases is Oracle's answer to scalability, easy adding of nodes AFTER a resource shortage has been detected..

When you define a service for an administrator-managed database, you define which instances support that service and these administrator-managed databases are known as the PREFERRED instances. You can also define other instances to support a service if the service's preferred instance fails, and these are known as AVAILABLE instances.

When you define services for a policy-managed database, you define the service to a server pool where the database is running. ?You can define the service as either uniform policy(running on all instances in the server pool) or a singleton (running on only one instance in the server pool). For singleton policy services, RAC chooses on which instance in the server pool the service is active. ?If that instance fails, then the service fails over to another instance in the pool. A service can only run in one server pool.

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