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Examine the Data Guard configuration:
DGMGRL > show configuration;
Configuration-Animals
Protection Mode: MaxAvailabilityDatabases:
dogs- Primary database
dogsfsl –Far Sync
sheep- Physical standby database
Fast-Start Failover: DISABLED
Configuration Status:
SUCCESS
An attempt to enable fast-start failover raises an eror:
DGMGRL> enable fast_start failover;
Error: ORA-16693: requirements not met for enabling fast-start failover
Failed.
Identify two possible reasons for this error.

A.
The FastStartFailoverTarget property is not set on Sheep.

B.
The FastStartFailoverTarget property is not set on Dogs.

C.
The FastStartFailoverTarget property is not set on DogsFS1.

D.
The LogXptMode property is set to ASYNC on Dogs.

E.
The RedoRoutes property is not set on Dogs.

F.
The RedoRoutes property is not set on DogsFS1.

Explanation:
D: Ensure that the LogXptMode property for both the primary database and the Fast-Start Failover target
standby database are SYNC.
A: If more than one physical or logical standby database exists, in this case it is the sheep database, you must
specify the FastStartFailoverTarget value explicitly, prior to enabling fast-start failover. The indicated target is
verified when fast-start failover is enabled.
Note: DGMGRL> enable fast_start failover;
Error: ORA-16651: requirements not met for enabling fast-start failover
Failed.
SOLUTION
1) Check whether the flashback database is enabled on primary & standby database
Select flashback_on from gv$database;
2) Check whether you have set the FastStartFailoverTarget parameter.
https://docs.oracle.com/cd/E11882_01/server.112/e40771/dbpropref.htm#DGBKR862
http://psoug.org/oraerror/ORA-16651.htm

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