How to Initiate the AWS Oracle RDS Data Guard switchover using the AWS CLI

Switch primary to read replica (standby ) and vice-versa

AWS CLI :

aws rds switchover-read-replica --db-instance-identifier ora-orcl-demo2 --region us-west-2

aws rds switchover-read-replica --db-instance-identifier ora-orcl-demo1  --region us-east-1

aws rds describe-db-instances --db-instance-identifier ora-orcl-demo1 

AWS Link 

https://aws.amazon.com/blogs/database/managed-oracle-data-guard-switchover-with-amazon-rds-for-oracle/