The Database Cloud Service offers fully-managed Oracle Database instances on the cloud. It provides flexibility and control over the database configuration and allows users to deploy various editions of Oracle Database, such as Standard Edition, Enterprise Edition, and Enterprise Edition High Performance.

Exadata Cloud Service is a dedicated infrastructure service that provides the Oracle Exadata Database Machine as a cloud service. It is designed for high-performance OLTP and data warehousing workloads that require extreme performance, scalability, and reliability.

MySQL Cloud Service offers fully-managed instances of MySQL, an open-source relational database management system. It is suitable for web applications, development, and testing scenarios.

Oracle offers NoSQL Database Cloud Service, which is a fully-managed cloud-based NoSQL database service. It is designed for managing unstructured and semi-structured data with high availability and horizontal scaling.