FastStartFailoverLagLimit: Allow Failover even if the Standby is Lagging Behind

How to Enable fast Start Failover in Maximum Performance Mode

FSFO can be enabled even if the configuration is operating in Maximum Performance mode by setting configuration Property FastStartFailoverLagLimit

Configuration property FastStartFailoverLagLimit allows to occur failover to Physical standby database even if it is lagging behind Primary database. The value is defined in seconds.
If the physical standby database is lagging behind Primary with in this limit and Primary is not available, Failover can occur. In this situation it is acceptable by business to have data loss.

The value for FastStartFailoverLagLimit must not be less than RPO (recovery point objective) defined by business.The Property is used only if the configuration is operating in MaxPerformance mode and FSFO is enabled. B

Broker Default value is 30 seconds

Minimum configurable value is 5 sec

Value 0 means property is ignored and is the default value in case of MaxAvailability and MaxProtection mode

DGMGRL> edit configuration set property FastStartFailoverLagLimit=180;
Property "FastStartFailoverLagLimit" updated.

In the example above I set FastStartFailoverLagLimit to 3 min. This means if my Physical standby database is lagging behind Primary for less than 3 min (say 2 min) and Primary become unavailable, Failover will proceed.

However if my Physical standby database is lagging behind Primary for more than 3 min (Say 5 min) Failover will not be allowed to ensure to prevent any unwanted data loss.

If configuration is not operating in Maximum Performance Mode , attempting to modify the property will result in following error

DGMGRL> edit configuration set property FastStartFailoverLagLimit=180;
Error: ORA-16903: change of FastStartFailoverLagLimit property violates configuration protection mode

Failed.

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