The Network Anchor abstraction establishes the mapping between Azure networking resources and corresponding OCI networking constructs. It is particularly important for services that use the newer multicloud anchor model, allowing an Azure VNet and delegated subnet to be associated consistently with Oracle-managed resources.

Oracle's DNS documentation explicitly restricts the Network Anchor DNS-resolution capability in question to Oracle Base Database Service . Network Anchors can provide DNS integration between Azure and OCI, including inbound and outbound resolution paths. Depending on the configuration, DNS listening and forwarding functionality can be enabled so resources on either side of the multicloud boundary can resolve the required private names.

The question's "Replicate DNS Private zones during DB creation" behavior belongs to this Base Database Service Network Anchor DNS workflow. Exadata Database Service on Dedicated Infrastructure and Exadata Database Service on Exascale Infrastructure use their documented Exadata networking and DNS provisioning mechanisms. Autonomous AI Database likewise has its own networking lifecycle and is not the service to which this Network Anchor-specific private-zone replication setting applies.

Therefore, the database service required to expose the specified option is Oracle Base Database Service .

Study Guide reference: Configure Oracle AI Database@Azure Networking — Network Anchors, private DNS, inbound/outbound DNS resolution, Base Database Service networking.

===============