This image shows primary and standby regions in both Oracle Cloud Infrastructure (OCI) and Microsoft Azure. Oracle Exadata Database Service runs in an Exadata virtual machine (VM) cluster in the primary site, with Oracle Data Guard replicating the data to the standby database running on an Exadata VM cluster in the standby site.

The primary and standby Azure regions have similar topologies. A single availability zone contains a VNet with two subnets:

AKS subnet: Provides a load balancer to handle traffic from a domain name server (DNS). It also provides a containerized Azure Kubernetes Service (AKS) application. The container images are stored in the Azure container registry and are replicated between primary and standby regions.
Client subnet: A delegated subnet that provides communication with the Oracle Exadata Database Service in the Oracle VCN.

Each Azure availability zone also hosts an OCI child site with a single virtual cloud network (VCN) that spans the Azure and OCI regions.

The primary and standby OCI regions have similar topologies. Each provides a hub VCN and a primary VCN that spans the Azure and OCI regions.

The primary VCN provides the Oracle Exadata Database Service, a service gateway, a local peering gateway (LPG) and two subnets:

Client subnet: Handles communication with OCI by using a local peering gateway (LPG). Database keys are stored in Oracle Cloud Infrastructure Vault and replicated between the regions. Oracle Data Guard replicates data from the primary region to the standby region.
Backup subnet: Backups are provided in each region by using Oracle Database Autonomous Recovery Service.

The hub VCN in each OCI region provides an LPG and a dynamic routing gateway (DRG). Each OCI region also provides Oracle Cloud Infrastructure Vault and Oracle Database Autonomous Recovery Service.