A company is building a serverless application using Amazon API Gateway and AWS Lambda. The application needs to store user session state data that requires sub-millisecond read latency. <br/><br/>Which database solution should the solutions architect recommend?

Answer options:

Amazon RDS for PostgreSQL

Amazon DynamoDB with DynamoDB Accelerator (DAX)

Amazon S3

Amazon Aurora Serverless

How to approach this question

Look for the keyword 'sub-millisecond'. This usually points to an in-memory cache like DAX or ElastiCache.

Full Answer

B.Amazon DynamoDB with DynamoDB Accelerator (DAX)✓ Correct

Amazon DynamoDB Accelerator (DAX) is a fully managed, highly available, in-memory cache for Amazon DynamoDB that delivers up to a 10x performance improvement—from milliseconds to microseconds—even at millions of requests per second.

Common mistakes

Choosing standard DynamoDB, which only provides single-digit millisecond latency.

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