Source : https://valehagayev.wordpress.com/2016/07/09/dataguard-commands-and-sql-scripts/
start redo apply in foreground
stop redo apply process on the Standby database (to stop MRP)
start real-time redo apply
start redo apply in background
check redo apply and Media recovery service status
gather Data Guard configuration information(standby)
calculate the Redo bytes per second
check status of Data Guard synchronization(standby)
verify there is no log file gap between the primary and the standby database
verify that the primary database can be switched to the standby role
convert the primary database into a physical standby
verify Managed Recovery is running on the standby
show information about the protection mode, the protection level, the role of the database, and switchover status
On the standby database, query the V$ARCHIVED_LOG view to identify existing files in the archived redo log
On the standby database, query the V$ARCHIVED_LOG view to verify the archived redo log files were applied.
To determine which log files were not received by the standby site.
MRP : Managed Recovery Process
et bien plus encore sur le DG Broker .