You are helping the development team to create an Aurora MySQL cluster for a new web application. The cluster was created with a Dev/Test template since it was unclear about the details of requirements. There was only one writer in the DB cluster, and there was no read replica. Recently, the Aurora database proved to be successful. You were told to configure the DB cluster to make it highly available. How should you set up the existing Aurora cluster?

Answer options:

A.In the RDS console, add Aurora Replicas to the DB cluster by actions -> add reader.
B.Since an active Aurora cluster cannot configure read replicas, delete and recreate the Aurora cluster with a Production template.
C.Use AWS CLI to configure cross-region replications for the DB cluster to make it highly available.
D.Delete the cluster and create a new Aurora cluster with a serverless feature to make it highly available.

Correct Answer – A
Aurora read replicas can spread over multiple Availability Zones to improve the availability of the DB cluster. About how to add replicas, refer to
https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/aurora-replicas-adding.html.
Option A is CORRECT: Because a replica can be easily added in AWS console:
Option B is incorrect: Because it is unnecessary to remove and recreate the cluster.
Option C is incorrect: Because the question does not mention that cross-region replications are needed. A regional replica should already meet the need.
Option D is incorrect: Because the serverless feature mainly solves the problem of capacity. Aurora Serverless clusters and provisioned clusters have the same kind of highly available storage volume.