aws rds start-db-instance
Starts an Amazon RDS DB instance that was stopped using the Amazon Web Services console, the stop-db-instance CLI command, or the StopDBInstance operation. AWS CLI reference
2 options Its page in the AWS CLI reference
Options
--db-capacity-reservation-identifierThe identifier or the name of the DB capacity reservation for the DB instance to use after it starts.--db-instance-identifierThe user-supplied instance identifier.