AWS Certified Cloud Practitioner — Question 686

A company has an application that stores a high volume of unstructured data and session history. The company needs to scale the application reliably to millions of concurrent users while ensuring consistent low latency.

Which AWS service meets these requirements?

Answer options

• A. Amazon RDS for MariaDB
• B. Amazon DynamoDB
• C. Amazon RDS for SQL Server
• D. Amazon Redshift

Correct answer: B

Explanation

Amazon DynamoDB is a fully managed NoSQL database service designed to handle unstructured data and session history with consistent, single-digit millisecond latency at any scale. Relational databases like Amazon RDS for MariaDB and SQL Server are not optimized for unstructured data or scaling to millions of concurrent users as easily. Amazon Redshift is an analytical data warehouse optimized for complex OLAP queries rather than high-concurrency, low-latency transactional session storage.