Which service is an Apache Cassandra-compatible database service?

• A. Amazon DynamoDB
• B. Amazon Neptune
• C. Amazon RDS
• D. Amazon Keyspaces (for Apache Cassandra)

Answer: (D)

Amazon Keyspaces is a fully managed, serverless database service that is compatible with Apache Cassandra. This means you can connect with Cassandra drivers and use the Cassandra Query Language (CQL) to interact with tables, and workloads built for Cassandra can be ported with minimal changes. It preserves Cassandra’s wide-column data model with partition keys and clustering keys, enabling scalable, low-latency reads and writes without the operational burden of provisioning or managing Cassandra clusters yourself.

DynamoDB operates on its own API and data model, not Cassandra-compatible. Neptune is a graph database optimized for graph workloads, not Cassandra's wide-column approach. RDS provides relational databases, which are a different paradigm from Cassandra’s NoSQL model.