AWS Certified Developer – Associate — Question 318

A company has a virtual reality (VR) game. The game has a serverless backend that consists of Amazon API Gateway, AWS Lambda, and Amazon DynamoDB. Recently, the company noticed a sudden increase of new users globally. The company also noticed delays in the retrieval of user data.

Which AWS service or feature can the company use to reduce the database response time to microseconds?

Answer options

• A. Amazon ElastiCache
• B. DynamoDB Accelerator (DAX)
• C. DynamoDB auto scaling
• D. Amazon CloudFront

Correct answer: B

Explanation

DynamoDB Accelerator (DAX) is an in-memory cache specifically designed for DynamoDB that provides microsecond response times for read-heavy workloads without requiring application code changes. While Amazon ElastiCache also offers in-memory caching, it requires significant application-side modification to manage cache logic. DynamoDB auto scaling adjusts throughput capacity to handle load but does not lower latency to microseconds, and Amazon CloudFront is a content delivery network for edge caching rather than direct database acceleration.