AWS Certified Developer – Associate (DVA-C02) — Question 430

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 purpose-built for Amazon DynamoDB that delivers microsecond response times for read-heavy workloads without requiring application-side cache management logic. Amazon ElastiCache also provides in-memory caching but requires manual integration and code modifications, unlike the seamless API-compatible integration of DAX. DynamoDB auto scaling adjusts throughput capacity based on traffic but does not lower latency to microseconds, and Amazon CloudFront is a content delivery network for edge caching, not database queries.