Q55 — AWS DVA-C02 Ch.2

Question 55 of 100 | ← Chapter 2

A company is storing large files in Amazon S3 and is building a web application to display metadata about those files to end users. Users select objects to download based on this metadata. The company requires a mechanism to index the files and store metadata with single-digit millisecond latency for retrieval.

• A. Amazon DynamoDB ✓
• B. Amazon EC2
• C. AWS Lambda
• D. Amazon RDS

Correct Answer: A. Amazon DynamoDB

Explanation

Amazon DynamoDB is a fast, fully managed NoSQL database service that delivers single-digit millisecond latency for data access, making it ideal for indexing files and storing metadata. Its key-value storage model and high availability characteristics make it well-suited for scenarios requiring rapid retrieval and updates. Therefore, Amazon DynamoDB is the appropriate AWS service to achieve millisecond-latency metadata retrieval. Option B (EC2) is a compute service, option C (Lambda) is a serverless compute service for running code, and option D (RDS) is a relational database service — none meet the low-latency metadata indexing requirement.