Enable Fast-Start-Failover Data Guard Broker (in Zero Data Loss Mode) with OBSERVER

This feature increases the availability of the database by eliminating the need for DBA involvement as part of the failover process.
Fast-Start Failover enables the broker to perform these tasks automatically failover to standby database.
The key to this feature is a monitoring process appropriately named the Observer.
The Observer is a component of the DGMGRL interface that is configured on a system outside the systems actually running the Oracle Data Guard configuration, which monitors the availability of the primary database.
It will issue a failover after waiting the number of seconds specified by the FastStartFailoverThreshold property

01. Creation ADG configuration

• 01.01. Creation configuration PRIMARY-STANDBY and testing switchover
• 01.02. Creation new service and connection string (TAF)
• 01.03. Enabling MaxAvailability mode
• 01.04. Enabling the FAST START FAILOVER mode (in Zero Data Loss Mode)
• 01.05. Enabling the OBSERVER

02. Сrash testing

• 02.01. Break of connection between PRIMARY and STANDBY
• 02.02. Break of connection between PRIMARY and OBSERVER
• 02.03. Break of connections between PRIMARY and STANDBY&OBSERVER

03. Monitoring

• 03.01. System status monitoring