AWS Certified Developer – Associate (DVA-C02) — Question 508

An application is experiencing performance issues based on increased demand. This increased demand is on read-only historical records pulled from an Amazon RDS-hosted database with custom views and queries. A developer must improve performance without changing the database structure.

Which approach will improve performance and MINIMIZE management overhead?

Answer options

• A. Deploy Amazon DynamoDB, move all the data, and point to DynamoDB.
• B. Deploy Amazon ElastiCache (Redis OSS) and cache the data for the application.
• C. Deploy Memcached on Amazon EC2 and cache the data for the application.
• D. Deploy Amazon DynamoDB Accelerator (DAX) on Amazon RDS to improve cache performance.

Correct answer: B

Explanation

Amazon ElastiCache (Redis OSS) is a fully managed caching service that reduces read latency on Amazon RDS databases without requiring schema changes, thereby minimizing administrative overhead. Deploying Memcached on Amazon EC2 introduces significant management overhead because the developer must manually patch and maintain the EC2 instances. Amazon DynamoDB Accelerator (DAX) is designed exclusively for Amazon DynamoDB and cannot be used with Amazon RDS.