dbInstanceIdentifier

A name for the DB instance. If you specify a name, AWS CloudFormation converts it to lowercase. If you don't specify a name, AWS CloudFormation generates a unique physical ID and uses that ID for the DB instance. For more information, see Name Type. For information about constraints that apply to DB instance identifiers, see Naming constraints in Amazon RDS in the Amazon RDS User Guide. If you specify a name, you can't perform updates that require replacement of this resource. You can perform updates that require no or some interruption. If you must replace the resource, specify a new name.