Examine the Data Guard configuration: DGMGRL> show configuration; Configuration - Animals Protection Mode: Max Availability Databases: dogs - Primary…

When enabling fast-start failover, certain conditions must be met:

The fastStartFailoverTarget property is not set on Dogs (A): The primary database (Dogs) needs to

have a fast-start failover target configured for the operation to succeed.

The LogXptMode property is set to ASYNC on Sheep while Sheep is the target standby database (B):

Fast-start failover requires synchronous redo transport (SYNC or FASTSYNC) to ensure zero data loss,

which is a prerequisite for enabling the feature.

The LogXptMode property is set to ASYNC on Dogs (D): Similar to the previous point, the primary

database must be configured to use synchronous redo transport for the fast-start failover to be

possible.

Reference:

Oracle Data Guard Broker documentation

Oracle Database Error Messages Guide