# aws rds > CLI for AWS Relational Database Service. > Create and manage relational databases. > More information: . - Display help for specific RDS subcommand: `aws rds {{subcommand}} help` - Stop instance: `aws rds stop-db-instance --db-instance-identifier {{instance_identifier}}` - Start instance: `aws rds start-db-instance --db-instance-identifier {{instance_identifier}}` - Modify an RDS instance: `aws rds modify-db-instance --db-instance-identifier {{instance_identifier}} {{parameters}} --apply-immediately` - Apply updates to an RDS instance: `aws rds apply-pending-maintenance-action --resource-identifier {{database_arn}} --apply-action {{system-update}} --opt-in-type {{immediate}}` - Change an instance identifier: `aws rds modify-db-instance --db-instance-identifier {{old_instance_identifier}} --new-db-instance-identifier {{new_instance_identifier}}` - Reboot an instance: `aws rds reboot-db-instance --db-instance-identifier {{instance_identifier}}` - Delete an instance: `aws rds delete-db-instance --db-instance-identifier {{instance_identifier}} --final-db-snapshot-identifier {{snapshot_identifier}} --delete-automated-backups`