Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 505 discussion

Purchasing a 1-year Savings Plan (option A) or a 1-year Reserved Instance (option B) may provide cost savings, but they are more suitable for long-running, steady-state workloads. Since your batch jobs run for a specific period each day, using Spot Instances with the ability to scale out based on CPU usage is a more cost-effective choice.

C is the most cost-effective solution in this scenario. Using Spot Instances allows EC2 capacity to be purchased at significant discounts compared to On-Demand prices. The auto scaling group can scale out to add Spot Instances when needed for the batch jobs. If Spot Instances become unavailable, regular On-Demand Instances will be launched instead to maintain capacity. The potential for interruptions is acceptable since failed jobs can be re-run.

Stateless, most cost-effective >> Spot

You don't need any scaling really as the job runs on another EC2 instance if it fails on first one. A. B. D are all more expensive than C due to spot instance being cheaper than reserved instances.

Spot Instances to the rescue....whooosh

" If a job fails on one instance, another instance will reprocess the job". This ensures Spot Instances are enough for this case

Since your batch jobs run for a specific period each day, using Spot Instances with the ability to scale out based on CPU usage is a more cost-effective choice.

C FOR ME COS OF SPOT INSTACES

First I think it is B but because of cost saving I think it should be C spot instances.

c for me