You can call <a>DescribeValidDBInstanceModifications</a> to learn what modifications you can make to your DB instance. You can use this information when you call <a>ModifyDBInstance</a>.
get/#Action=DescribeValidDBInstanceModifications
Query parameters
DBInstanceIdentifierstring required
The customer identifier or the ARN of your DB instance.
Action'DescribeValidDBInstanceModifications' required
Version'2014-10-31' required
Response
Success