Q79 — AWS DVA-C02 Ch.3

Question 79 of 100 | ← Chapter 3

An organization stores large files in Amazon S3 and is developing a web application to display metadata about those files to end users. Based on the metadata, users select an object for download. The organization requires a mechanism to index file metadata and retrieve it with low latency—measured in milliseconds. Which AWS service should be used to achieve this?

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

Correct Answer: A. Amazon DynamoDB

Explanation

Amazon DynamoDB is a fully managed, high-performance NoSQL database service ideal for storing and retrieving metadata with single-digit millisecond latency. It supports scalable, low-latency key-based lookups—perfect for indexing S3 object metadata. EC2 requires manual provisioning, patching, and scaling, introducing operational overhead and latency variability. Lambda is compute-oriented, not a persistent metadata store. RDS is optimized for relational workloads and transactional consistency, not ultra-low-latency key-value retrieval. Thus, DynamoDB best fulfills the requirement. 【Provided by Lantern Certification: swufelp1999】