1.Primary database : The database that we wish to protect in the event of any disaster is called primary database.
2.Standby database : The database on which we are depending in the event of primary collapse.
3.Oracle networking : Facilitates movement of data from primary to physical standby.
4.Log transport service : Service at primary which helps in shipping of data from primary to standby(ARCH,LGWR,LNS).
5.Log apply service : Service at physical standby which applies the data at standby(MRP).
6.Dataguard broker : Its an optional componenet generally configured for fast failover and switch over. If we configure dataguard broker with minimal effort, we can switch over.
Note : If we configure dataguard broker, DMON(Dataguard Monitor) get enabled.
