Change apply instance(standby) in DG broker using dgmgrl

This is the current configurtion

DGMGRL> show configuration

Configuration - broker_config

  Protection Mode: MaxPerformance
  Databases:
    TROY_DR - Primary database
    TROY    - Physical standby database

Fast-Start Failover: DISABLED

Configuration Status:
SUCCESS

here apply instance is currently TROY2. We will change it to TROY1

DGMGRL> show database 'TROY'

Database - TROY

  Role:            PHYSICAL STANDBY
  Intended State:  APPLY-ON
  Transport Lag:   0 seconds
  Apply Lag:       0 seconds
  Real Time Query: ON
  Instance(s):
    TROY1
    TROY2 (apply instance)

Database Status:
SUCCESS

set redo apply off and then edit the instance

DGMGRL> edit database 'TROY' set state='apply-off';
Succeeded.
DGMGRL> show database 'TROY'

Database - TROY

  Role:            PHYSICAL STANDBY
  Intended State:  APPLY-OFF
  Transport Lag:   0 seconds
  Apply Lag:       0 seconds
  Real Time Query: OFF
  Instance(s):
    TROY1
    TROY2 (apply instance)

Database Status:
SUCCESS

DGMGRL> edit database 'TROY' set state='apply-on' with apply instance ='TROY1';
Succeeded.

now verify

DGMGRL> show database 'TROY'

Database - TROY

  Role:            PHYSICAL STANDBY
  Intended State:  APPLY-ON
  Transport Lag:   0 seconds
  Apply Lag:       0 seconds
  Real Time Query: ON
  Instance(s):
    TROY1 (apply instance)
    TROY2

Database Status:
SUCCESS

DGMGRL> show configuration

Configuration - broker_config

  Protection Mode: MaxPerformance
  Databases:
    TROY_DR - Primary database
    TROY    - Physical standby database

Fast-Start Failover: DISABLED

Configuration Status:
SUCCESS