Each Oracle Exadata Database Service on Dedicated Infrastructure instance consists of one or more virtual machine (VM) clusters. The infrastructure resides on Exadata database and storage server racks in an Oracle Cloud Infrastructure (OCI) region and availability domain. A region is a localized geographic area, and an availability domain is one or more data centers located within a region.
When setting up your Exadata Database Service on Dedicated Infrastructure instance, you create a virtual cloud network (VCN) to connect your on-premises network or data center to the VM clusters that run your database.
You connect your on-premises equipment to your VCN by using Site-to-Site VPN or OCI FastConnect through a dynamic routing gateway (DRG). You can also optionally set up a network address translation (NAT) gateway between the client subnet and the internet to reach public endpoints that are not supported by the service gateway.
Within your VCN you have, at a minimum, two private subnets:
- Client subnet: Use this subnet to provide access from your on-premises network or data center applications to your database. You can also connect your database to other cloud services within the Oracle services network by using the client network through the service gateway.
- Backup subnet: Use this subnet to back up your database to Oracle Autonomous Recovery Service (recommended) or OCI Object Storage within the Oracle services network. The backup network keeps high-load activities separate from application connections.
You connect to Object Storage through the through the service gateway. If you customize backups to Object Storage using the backup API, you might also need to set up a static route.
Unlike backups to object storage that uses the service gateway to reach the backup destination, the Recovery Service uses a private subnet inside the VCN where your database resides. The private subnet defines the network path for backups between your database and Recovery Service. Your Oracle Cloud database can reside in the same private subnet used by Recovery Service or in a different subnet within the same VCN.