•
Clock Hours of Server Time -Resources incur
charges when they are running. For example, from the time
you launch a DB instances until you terminated the
DB instance.
•
Database Characteristics -The physical capacity
of the database you choose will affect how much you are
charged. Database characteristics vary depending on the
database engine, size, and memory class.
•
Database Purchase Type - When you use On-Demand DB Instances, you pay for compute capacity for each
hour your DB Instance runs, with no required minimum
commitments. With Reserved DB Instances, you can make
a low, one-time, up-front payment for each DB Instance you
wish