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

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Failover

Failover is initiated when a serious problem exists on the primary database, making it inaccessible. This problem generally arises from hardware or software errors on the server or storage layer; also, a disaster may cause complete or partial loss of services. In such cases, we can convert a standby database role to primary by performing failover and continue providing it with production database service. Performing a Data Guard failover operation for production purposes is a serious consideration and needs a lot of caution. The following considerations are important in this context:

  • Failover decision must be taken with regard to the service Recovery Time Objective (RTO) value.
  • The standby database hardware must be powerful enough to sustain ...

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