AWS provide 3 Billing Model :
On-Demand : is the default AWS billing model. You pay for what you consume. $per hour, $per GB transfered, $ per GB month stored.
On-Demand ideally suited for the ad-hoc usage, where you cant calculate future usage patterns and not ready for interruption or failure.
It provides small discounts on high volume but generally most expensive billing model.
Reserved : this model provides significant reductions in cost & capacity reservations in exchange for commiting to a 12 or 36 month term.
You can pay All Upfront , Partial Upfront or No Upfront - with Full Upfront providing the best cost advantages.
Reservations can be ised for EC2 instances , RDS instances, DynamoDB performance and many other services in AWS.
Reserved terms are useful when your usage is known and steady-state.
You can reserve in a Region and also inside a AV-Zone. AvZone can also give you reserve capacity.
Spot : this is suited for workload where failure and interruption is acceptable but want lowest price.
Spot pricing can be significantly cheaper than on demand but 100% defendant on spare capacity & price can be higher if capacity is constrained.
Resources you choose to allocate using a spot pricing plan can be terminated with very little notice any workloads need to be tolerant of interruption.
Spot resources have the lowest startup priority vs on-demand and reserved.
https://aws.amazon.com/blogs/aws/amazon-ec2-update-streamlined-access-to-spot-capacity-smooth-price-changes-instance-hibernation/
https://aws.amazon.com/blogs/compute/new-amazon-ec2-spot-pricing/
https://github.com/open-guides/og-aws#billing-and-cost-management
On-Demand : is the default AWS billing model. You pay for what you consume. $per hour, $per GB transfered, $ per GB month stored.
On-Demand ideally suited for the ad-hoc usage, where you cant calculate future usage patterns and not ready for interruption or failure.
It provides small discounts on high volume but generally most expensive billing model.
Reserved : this model provides significant reductions in cost & capacity reservations in exchange for commiting to a 12 or 36 month term.
You can pay All Upfront , Partial Upfront or No Upfront - with Full Upfront providing the best cost advantages.
Reservations can be ised for EC2 instances , RDS instances, DynamoDB performance and many other services in AWS.
Reserved terms are useful when your usage is known and steady-state.
You can reserve in a Region and also inside a AV-Zone. AvZone can also give you reserve capacity.
Spot : this is suited for workload where failure and interruption is acceptable but want lowest price.
Spot pricing can be significantly cheaper than on demand but 100% defendant on spare capacity & price can be higher if capacity is constrained.
Resources you choose to allocate using a spot pricing plan can be terminated with very little notice any workloads need to be tolerant of interruption.
Spot resources have the lowest startup priority vs on-demand and reserved.
https://aws.amazon.com/blogs/aws/amazon-ec2-update-streamlined-access-to-spot-capacity-smooth-price-changes-instance-hibernation/
https://aws.amazon.com/blogs/compute/new-amazon-ec2-spot-pricing/
https://github.com/open-guides/og-aws#billing-and-cost-management
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