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Oracle Data Guard 11gR2 Administration Beginner's Guide by Nassyam Basha, Emre Baransel

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Chapter 6. Data Guard Role Transitions

Switchover and failover are the role transition options in Data Guard. Physical and logical standby databases have different practices in this context. In this chapter we will cover the necessary steps to accomplish a successful switchover or failover in a physical or logical standby database environment.

Role transition considerations

In Data Guard, we can simply distinguish switchover and failover as planned and unplanned role transitions. A switchover is a planned role transition between the primary database and one of its standby databases. Switchover can be considered to reduce downtime during scheduled maintenance on the primary system or to test stability for future role transitions. Switchover guarantees ...

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