Oracle 19c Fast-Start Failover Observe-Only Mode

Description:-

Test fast-start failover without impacting the production database
Determine when a failover or other interaction would have occurred during
normal production processing
Discover what circumstances would cause an automatic failover to occur
Easier justify using Fast-Start Failover s to reduce the recovery time for failovers
The observe-only mode for fast-start failover enables you to test how fast-start failover will work in your environment. There is no impact on your current configuration or on applications.
In this mode, no actual changes are made to your Broker configuration. When the conditions for fast-start failover are met, the Broker adds messages to the observer log and broker log indicating that fast-start failover would have been initiated. The logs also contain other details about the actions that will be performed in case of a failover.

Note the following points about the observe-only mode:

The primary database can enter UNSYNC or LAGGING state without an acknowledgement from the observer or target standby.
The primary database can be opened even if there is no acknowledgement from the observer or target standby.
Manual failover to the fast-start failover target can be performed without receiving an acknowledgement from the observer.
Manual failover can be performed even if the pre-condition checks are not met. This includes the following: broker configuration is in UNSYNC or LAGGING state or unobserved state, failover target is invalid, reinstatement is in progress, or a master observer switch is in progress.
You can switch over or manual failover to a bystander database.

DGMGRL> ENABLE FAST_START FAILOVER OBSERVE ONLY;
Enabled in Observe-Only Mode.

DGMGRL> SHOW CONFIGURATION;

Configuration – hari

Protection Mode: MaxAvailability
Members:
delhi – Primary database
chennai – (*) Physical standby database

Fast-Start Failover: Enabled in Observe-Only Mode

Configuration Status:
SUCCESS (status updated 35 seconds ago)

DGMGRL> disable FAST_START FAILOVER;
Disabled.

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