When is it most appropriate to use Amazon EC2 On-Demand Instances?
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Correct answer: For an unpredictable workload that doesn't require a long-term commitment.
Why this is the answer
On-Demand Instances are ideal for unpredictable workloads without long-term commitments because you pay for compute capacity by the hour or second with no upfront costs or minimum contracts. This flexibility allows you to scale resources up or down as needed. For a steady-state workload that requires a specific EC2 instance type for a long duration: Reserved Instances (RIs) or Savings Plans are more cost-effective for predictable, long-running workloads. For a workload that can be interrupted and needs the lowest possible cost: Spot Instances are designed for fault-tolerant workloads that can tolerate interruptions, offering the deepest discounts. For a workload expected to run for longer than one year: Reserved Instances or Savings Plans provide significant cost savings for commitments of one year or more.
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