The image shows Oracle Exadata Database Service on Oracle Database@Azure with three regions: Azure Region 1 and OCI Region 1, Azure Region 2 and OCI Region 2, and Azure Region 3 and OCI Region 3.

Azure Region 1 hosts the Primary Oracle Database. Azure Region 2 and Azure Region 3 host Standby1 Database and Standby2 Database.

Each of the regions has the same architecture with unique names of the VCNs, Hub VCNs, LPGs, and DRGs named based on the region.

Azure Region 1 hosts Availability Zone 1 running Oracle Database@Azure in VCN1 (10.10.0.0/16) with a Backup subnet (10.10.0.0/24) and a Client subnet 10.10.0.0/24) which are shared with OCI Region 1. The Primary Oracle Database is shared between the Backup and Client subnets. OCI Region 1 hosts Hub VCN1 (10.11.0.0/16) with Hub LPG1 route table and DRG1 route table.

Azure Region 2 hosts Availability Zone 2 and runs Oracle Database@Azure in VCN2 (10.20.0.0/16) with a Backup subnet (10.20.0.0/24) and a Client subnet (10.20.0.0/24) which are shared with OCI Region 2. OCI Region 2 hosts Hub VCN2 (10.22.0.0/16) with Hub LPG2 route table and DRG2 route table.

Azure Region 3 hosts Availability Zone 3 running Oracle Database@Azure in VCN3 (10.30.0.0/16) with a Backup subnet (10.30.0.0/24) and a Client subnet 10.30.0.0/24) which are shared with OCI Region 3. The Primary Oracle Database is shared between the Backup and Client subnets. OCI Region 3 hosts Hub VCN1 (10.33.0.0/16) with Hub LPG3 route table and DRG3 route table.

Primary Oracle Database replicates to the Standby1 Database in Azure Region 2 through OCI Region 1 and OCI Region 2 through LPG1 Remote locally peering with Hub LPG1 through DRG1 (in Hub VCN1) and remotely peers with DRG2 to Hub VCN2 which locally peers with LPG2 remote.

Primary Oracle Database also replicates to the Standby2 Database in Azure Region 3 through OCI Region 1 and OCI Region 3 through LPG1 Remote locally peering with Hub LPG1 through DRG1 (in Hub VCN1) and remotely peers with DRG3 to Hub VCN3 which locally peers with LPG3 remote.