How to do a switchover in Data Guard with Data guard Broker

How to do a switchover with Data guard Broker

Below you can see i have primary database prod and standby database sby1, so in this demo we will switchover where standby (sby1) becomes primary and primary (prod) becomes standby

DGMGRL>  show configuration

Configuration - dgconf1

  Protection Mode: MaxPerformance
  Databases:
    prod - Primary database
    sby1 - Physical standby database

Fast-Start Failover: DISABLED

Configuration Status:
SUCCESS

DGMGRL> switchover to sby1;
Performing switchover NOW, please wait...
New primary database "sby1" is opening...
Operation requires shutdown of instance "prod" on database "prod"
Shutting down instance "prod"...
ORA-01109: database not open

Database dismounted.
ORACLE instance shut down.
Operation requires startup of instance "prod" on database "prod"
Starting instance "prod"...
ORACLE instance started.
Database mounted.
Switchover succeeded, new primary is "sby1"

DGMGRL>
DGMGRL>   show configuration

Configuration - dgconf1

  Protection Mode: MaxPerformance
  Databases:
    sby1 - Primary database
    prod - Physical standby database

Fast-Start Failover: DISABLED

Configuration Status:
SUCCESS