Reserved DB instances for Amazon RDS
https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_WorkingWithReservedDBInstances.html
Let you reserve an instance for a 1-3 year term. In return for this long-term commitment, you receive a significant discount off the on-demand rate for that instance. The price for a reserved DB instance doesn't provide a discount for the costs associated with storage, backups, and I/O. RDS offers three RI payment options—no upfront, partial upfront, and all upfront. The cost of an RDS instance depends on the instance class, region, and payment option.
Let you reserve an instance for a 1-3 year term.
In return for this long-term commitment, you receive a significant discount off the on-demand rate for that instance.
The price for a reserved DB instance doesn't provide a discount for the costs associated with storage, backups, and I/O.
RDS offers three RI payment options—no upfront, partial upfront, and all upfront.
The cost of an RDS instance depends on the instance class, region, and payment option.
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