A company runs a serverless backend (API Gateway, Lambda, DynamoDB) for a VR game and has seen a sudden global increase in new users. The company observes delays retrieving user data. Which AWS service or feature will reduce database response times to microseconds?
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Correct answer: DynamoDB Accelerator (DAX).
Why this is the answer
DynamoDB Accelerator (DAX) is a fully managed, highly available, in-memory cache for DynamoDB that delivers microsecond response times for eventually consistent reads, even at millions of requests per second. This directly addresses the observed delays in retrieving user data. Amazon ElastiCache is a general-purpose caching service but requires more management and integration effort compared to DAX, which is purpose-built for DynamoDB. DynamoDB auto scaling helps manage throughput capacity but doesn't directly reduce read latency for individual requests. Amazon CloudFront is a content delivery network (CDN) primarily used for caching static and dynamic web content, not for accelerating database queries.
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