Data guard provision in OCI db system in Base Database Service

                  Data guard provision in OCI db system in Base Database Service

Oracle Data Guard on OCI Base Database System provides high availability and disaster recovery by creating a synchronized, standby replica of your database, supporting both same-region and cross-region configurations. 

It is enabled via the OCI Console under "Data Guard Associations" on the database details page, automating backend configuration like broker setup, log parameters, and network, requiring Enterprise Edition

For Base DB Systems, the managed Data Guard feature supports only a single Data Guard association (one standby database) per primary. Adding a second standby in another region from the Console or API is not supported.Multiple Data Guard associations per primary are not supported for Base DB Systems;

 you can have only one standby

if you want to create multiple standby database , you need to create manually by

creating a new DB System in the target region from backups (irestore). 

This provides an additional copy but is not a Data Guard standby.

this will not be managed by Data Guard

A cross-region Data Guard association cannot be created between databases of DB systems that belong to VCNs that are not peers . VCN must be peer

Key Aspects of Data Guard on Base Database Service

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Provisioning Process: Navigate to the Database Details page, select "Data Guard Associations," click "Enable Data Guard," and create a new peer DB system for the standby.

Configuration Options: Options include Data Guard (physical standby) or Active Data Guard (adds read-only/reporting capability).

Protection Modes: Choices include Maximum Availability, Maximum Performance, or Maximum Protection.

Supported Configurations: Supports single-instance to single-instance, or 2-node RAC to 2-node RAC, including across different regions.

Management: Once created, you can perform switchovers or failovers from the same Data Guard Association menu.

Licensing: Active Data Guard requires a separate license

Please refer below doc

https://docs.oracle.com/en/cloud/paas/base-database/dg-enable/index.html