Q86 — AWS DVA-C02 Ch.3

Question 86 of 100 | ← Chapter 3

An organization stores large files in Amazon S3 and is building a web application to display metadata about those files to end users. Based on the metadata, users select objects to download. The organization requires a mechanism to index file size metadata with single-digit millisecond latency retrieval. Which AWS service should be used to accomplish this task?

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

Correct Answer: A. Amazon DynamoDB

Explanation

DynamoDB is a fast, flexible NoSQL database service well-suited for high-concurrency, low-latency data access. It excels at storing and retrieving metadata—such as file sizes—with single-digit millisecond latency. EC2 provides compute capacity but is not designed for direct indexing and low-latency metadata retrieval. AWS Lambda is a serverless compute service for executing functions—not for indexing or persistent data storage. RDS is a relational database service; while capable, it is less efficient than DynamoDB for large-scale unstructured metadata indexing and ultra-low-latency retrieval. Thus, Option A is the correct answer.