Which AWS service is a scalable key-value database that delivers sub-millisecond latency at large scale?
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Correct answer: Amazon DynamoDB.
Why this is the answer
Amazon DynamoDB is a fully managed NoSQL key-value and document database designed for high-performance applications at any scale. It consistently delivers single-digit millisecond latency, making it ideal for use cases requiring very fast data access. Amazon Aurora is a relational database. Amazon DocumentDB is a document database compatible with MongoDB, not a key-value store. Amazon Neptune is a graph database service. While these services are scalable and performant, only DynamoDB is specifically a key-value database known for sub-millisecond latency at scale.
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