31. How will I be charged and billed for my use of Amazon RDS ?
No minimum or setup fees. You are billed based on:
DB instance hours
Storage (per GB per month)
I/O requests per month
Provisioned IOPS per month
32. What defines billable Amazon RDS instance hours ?
DB instance hours are billed for each hour your DB instance is running in an available state.
33. What is a reserved instance (RI) ?
Amazon RDS reserved instances give you the option to reserve a DB instance for a one or three year term and in turn receive a significant discount compared to the on-demand instance pricing for the DB instance. There are three RI payment options — No Upfront, Partial Upfront, All Upfront — which enable you to balance the amount you pay upfront with your effective hourly price.
34. What if I have an existing DB instance that I’d like to cover with a reserved instance ?
Simply purchase a DB instance reservation with the same DB instance class, DB engine, Multi-AZ option and License Model within the same Region as the DB instance you are currently running and would like to reserve.
35. How do I control which DB instances are billed at the reserved instance rate ?
The Amazon RDS operations for creating, modifying, and deleting DB instances do not distinguish between On-Demand and reserved instances. When computing your bill, our system will automatically apply your Reservation(s) such that all eligible DB instances are charged at the lower hourly reserved DB instance rate.