AWS Certified Developer Associate DVA-C02 Practice Question

The correct answer is Amazon DynamoDB. It is a fully managed NoSQL database service that provides single-digit millisecond performance at any scale, which is ideal for the high-velocity, unpredictable workloads of a social media application. Its flexible schema supports the evolving data model required for features like user profiles and metadata. Amazon RDS is a relational database service and is less suitable because it enforces a rigid schema, making it difficult to handle evolving, semi-structured social media data. Amazon Redshift is a data warehouse service optimized for large-scale data analytics and business intelligence, not for the high-throughput transactional reads and writes required by a live application. Amazon ElastiCache is an in-memory caching service used to accelerate access to data from a primary database, not as a standalone persistent data store for an entire application.