replicaMode

The open mode of a replica database.

This parameter is only supported for Db2 DB instances and Oracle DB instances.

Db2

Standby DB replicas are included in Db2 Advanced Edition (AE) and Db2 Standard Edition (SE). The main use case for standby replicas is cross-Region disaster recovery. Because it doesn't accept user connections, a standby replica can't serve a read-only workload.

You can create a combination of standby and read-only DB replicas for the same primary DB instance. For more information, see Working with read replicas for Amazon RDS for Db2 in the Amazon RDS User Guide.

To create standby DB replicas for RDS for Db2, set this parameter to mounted.

Oracle

Mounted DB replicas are included in Oracle Database Enterprise Edition. The main use case for mounted replicas is cross-Region disaster recovery. The primary database doesn't use Active Data Guard to transmit information to the mounted replica. Because it doesn't accept user connections, a mounted replica can't serve a read-only workload.

You can create a combination of mounted and read-only DB replicas for the same primary DB instance. For more information, see Working with read replicas for Amazon RDS for Oracle in the Amazon RDS User Guide.

For RDS Custom, you must specify this parameter and set it to mounted. The value won't be set by default. After replica creation, you can manage the open mode manually.