Which AWS service is a key-value database that provides sub-millisecond latency on a large scale?
Amazon DynamoDB
Amazon Aurora
Amazon DocumentDB (with MongoDB compatibility)
Amazon Neptune
Explanations:
Amazon DynamoDB is a fully managed NoSQL database service that provides key-value and document data structures, offering single-digit millisecond latency and sub-millisecond response times at scale.
Amazon Aurora is a relational database service compatible with MySQL and PostgreSQL, designed for high performance but not specifically a key-value store.
Amazon DocumentDB is a managed database service designed for document data, specifically compatible with MongoDB, but it does not primarily function as a key-value store.
Amazon Neptune is a graph database service that supports both property graph and RDF graph models, not a key-value database.