Which service is NOT available as part of the Oracle Cloud Free Tier?

The service that is not available as part of the Oracle Cloud Free Tier is OCI Exadata DB Systems. This is because Exadata is a high-performance database machine that is specifically designed for running Oracle Database workloads with advanced features and optimizations. It is typically used for enterprise applications that require significant resources and performance, which is why it is not included in the free tier offerings.

In contrast, OCI Compute, OCI Monitoring, and Oracle Autonomous Database (ADW) are included in the Free Tier. OCI Compute provides foundational compute capacity, allowing users to create virtual machines and scale as needed. OCI Monitoring offers essential metrics and insights into cloud resource performance, which are crucial for managing cloud environments. Oracle Autonomous Database, specifically for lightweight workloads, allows users to explore database capabilities without incurring costs, thus enabling experimentation and learning without financial commitment.