Your customer is planning for a maximum-availability architecture at their data center to address their planned downtime, unplanned downtime, and replication needs.
Consider these options:
- Instance, site recovery, and heterogeneous setup
- Inter-region and intra-region load balancing across replicated databases
- Fine-grained error investigation of incorrect results
- Integrated client and application failover
- Fastest and simplest database replication
Which four options would you recommend?
http://docs.oracle.com/cd/E16655_01/server.121/e17601/unplanned.htm#HAOVW11824
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