AWS Certified SysOps Administrator – Associate (legacy) — Question 926

A company is running a popular social media site on EC2 instances. The application stores data in an Amazon RDS for MySQL DB instance and has implemented read caching by using an ElastiCache for Redis (cluster mode enabled) cluster to improve read times. A social event is happening over the weekend, and the
SysOps Administrator expects website traffic to triple.
What can a SysOps Administrator do to ensure improved read times for users during the social event?

Answer options

• A. Use Amazon RDS Multi-AZ.
• B. Add shards to the existing Redis cluster.
• C. Offload static data to Amazon S3.
• D. Launch a second Multi-AZ Redis cluster.

Correct answer: B

Explanation

Adding shards to an ElastiCache for Redis (cluster mode enabled) cluster allows the system to scale out horizontally, accommodating the expected surge in read operations. Amazon RDS Multi-AZ is designed for high availability and failover, not read scaling, while launching a second cluster adds unnecessary architectural complexity. Offloading static data to S3 does not resolve the database read performance bottleneck addressed by the caching layer.