This image shows the interim architecture of an on-premises Oracle Database deployment being migrated to a Oracle Base Database Service VM database system in Oracle Cloud Infrastructure

The on-premises Oracle Database deployment has an application server and database server and an Oracle Cloud Infrastructure (OCI) Region with a Site-to-Site VPN connecting the on-premises data center to a dynamic routing gateway on the VCN of the OCI Region.

Oracle Recovery Manager (RMAN) backups are sent to and from the on-premises Oracle Database server through the storage gateway to OCI Object Storage.

The OCI region has one availability domain and three fault domains.
The region has a VCN across all three fault domains with the following private regional subnets:
- Application tier: Compartment A in the application tier has an OCI Load Balancer in Fault Domain 1 and an Application Server Compute in Fault Domain 2.
- Database tier: Compartment B in the database tier has a Client subnet with Oracle Base Database Service in Fault Domain 1.
Security lists are used to regulate traffic to and from the subnets.
Route tables are used to direct traffic bound for destinations outside the VCN.
A Dynamic Routing Gateway enables private connectivity from the on-premises data center to the private subnets, using site-to-site VPN.
A Service Gateway enables Oracle Base Database Service in the private subnet of the Database Tier to communicate with Oracle Cloud Infrastructure Object Storage.
RMAN is used to back up the on-premises database to Oracle Cloud Infrastructure Object Storage. Then, RMAN is used to restore the backed up database to a Oracle Base Database Service.

The following services are available Oracle Services Network:

OCI Object Storage
Logging
OCI IAM
Monitoring
Other Oracle Cloud Services

Oracle Database Zero Data Loss Autonomous Recovery Service is located in the OCI Region and connects to the Oracle Base Database Service through a private endpoint.