Which AWS service provides MongoDB compatibility as a fully managed, cloud-based database?

• A. Amazon DocumentDB (with MongoDB compatibility)
• B. Amazon DynamoDB
• C. Amazon RDS
• D. Amazon Neptune

Answer: (A)

MongoDB compatibility in a managed cloud service means the database speaks the same MongoDB API and wire protocol so applications written for MongoDB can connect and operate with little or no code changes, while the cloud provider handles underlying management tasks. Amazon DocumentDB is designed to be MongoDB-compatible, so you can use MongoDB drivers and tools while AWS manages the cluster, scaling storage, backups, monitoring, patching, and failover. This combination of compatibility and managed operations is what makes it the right choice for a fully managed, cloud-based MongoDB-like database.

DynamoDB is a fully managed NoSQL database with its own distinct API and data model, not MongoDB-compatible. RDS offers relational databases, which use SQL and structured schemas rather than a MongoDB API. Neptune is a graph database service optimized for graph workflows, not a document-oriented MongoDB experience.