A Database Specialist is setting up a new Amazon Aurora DB cluster with one primary instance and three Aurora Replicas for a highly intensive, business-critical application. The Aurora DB cluster has one medium-sized primary instance, one large-sized replica, and two medium sized replicas. The Database Specialist did not assign a promotion tier to the replicas.
In the event of a primary failure, what will occur?
A. Aurora will promote an Aurora Replica that is of the same size as the primary instance
B. Aurora will promote an arbitrary Aurora Replica
C. Aurora will promote the largest-sized Aurora Replica
D. Aurora will not promote an Aurora Replica
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In the event of a failover, Amazon RDS will promote the read replica that has the highest priority (the lowest numbered tier). If two or more replicas have the same priority, RDS will promote the one that is the same size as the previous primary instance.
A
Ans:C
More than one Aurora Replica can share the same priority, resulting in promotion tiers. If two or more Aurora Replicas share the same priority, then Amazon RDS promotes the replica that is largest in size. If two or more Aurora Replicas share the same priority and size, then Amazon RDS promotes an arbitrary replica in the same promotion tier.
https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/Aurora.Managing.Backups.html#Aurora.Managing.FaultTolerance
Priority: If you don’t select a value, the default is tier-1.
https://docs.amazonaws.cn/en_us/AmazonRDS/latest/AuroraUserGuide/aurora-replicas-adding.html