The image shows Oracle RAC database on Oracle Exadata Database Service on Dedicated Infrastructure with Oracle Data Guard across two OCI Regions: OCI Region 1 and OCI Region 2
The components are described in the surrounding text.
The OCI Region hosts an Availability Domain and OCI Managed Services.
The OCI Managed Services include OCI Vault, Oracle Database Autonomous Recovery Service, and OCI Object Storage.
The Availability Domain hosts a VCN with a Service Gateway and three subnets: Application subnet, Database client subnet, and Database backup subnet.
The Application hosted on OCI Compute connects to Oracle Exadata Database Service on Dedicated Infrastructure which connects to OCI Managed Services using the Service Gateway.