Free SAA-C03 practice scenarios: Spot, Reserved & Savings Plans

The four ways to pay for compute, and the workload shape that picks each one. Six cost-optimization scenarios, SAA-C03, 2026 edition.

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Compute pricing is the heart of the cost-optimization domain, and the SAA-C03 tests it as a matching exercise: four ways to pay, and a workload shape that selects exactly one. Read the workload for two properties — can it commit? and can it tolerate interruption? — and the answer falls out.

The four options by commitment and interruption

On-Demand — full price, no commitment, never interrupted. For short, unpredictable workloads that cannot commit.
Reserved Instances / Savings Plans — up to ~70% off for a 1- or 3-year commitment. For steady baseline usage.
Spot — up to ~90% off, but reclaimable with ~2 minutes’ notice. For fault-tolerant, interruptible workloads.

Two questions settle most scenarios. Predictable and long-running? A commitment plan. Interruption-tolerant and after the deepest discount? Spot. Neither — short and must stay up? On-Demand.

Savings Plans: Compute vs EC2 Instance

When the answer is a commitment, the exam often asks which Savings Plan:

Compute Savings Plan — the most flexible: change instance family, size, Region, OS, and it even covers Fargate and Lambda. Less discount, maximum freedom.
EC2 Instance Savings Plan — commit to a specific family in a Region for a deeper discount, keeping size flexibility within that family.

Flexibility versus depth of discount is the trade, and the requirement words — “change families and Regions” versus “one family, biggest discount” — tell you which.

The Spot discipline

Spot’s saving is real, but it only applies to workloads that can survive being reclaimed: stateless rendering with checkpoints, fault-tolerant big-data clusters, retryable CI/CD builds. The wrong-fit answer is always a stateful, must-stay-up workload — a production database on Spot is the classic mistake. If it cannot be interrupted, it cannot be on Spot, no matter how tempting the discount.

How to use the six scenarios below

Answer each one before opening the explanation, and when you miss, name the two properties that decided it — “can commit?”, “can be interrupted?”. Every explanation states them and dismantles the distractors, which are usually a cheaper option the workload cannot actually use. Cost questions look like arithmetic but are really about matching a workload to the right commitment, and the reasoning below builds that instinct. For the domain overview, see Design Cost-Optimized Architectures.

The four EC2 purchase options placed by commitment and workload. On-Demand pays full price for short, unpredictable, non-interruptible workloads with no commitment. Reserved Instances and Savings Plans give up to about seventy percent off in exchange for a one or three year commitment on steady baseline usage, with Compute Savings Plans the most flexible across family, size, Region and even Fargate and Lambda, and EC2 Instance Savings Plans a deeper discount tied to a family in a Region. Spot Instances give up to about ninety percent off for fault-tolerant, interruptible workloads that can handle a two-minute reclaim notice.

6 free SAA-C03 practice questions

Answers and explanations — no email wall

SAA-C03 Question 1 of 6

A company runs a steady, always-on production workload it expects to keep for the next three years and wants the lowest compute cost. It can commit to consistent usage. Which purchase option is most cost-effective?

Answer: A — A Savings Plan or Reserved Instance for a one- or three-year term.

Steady, predictable, long-running usage is exactly what a commitment discount rewards: a Savings Plan or Reserved Instance cuts cost sharply — up to roughly 70% — for a one- or three-year commitment. Why not the others: On-Demand pays full price and only makes sense when you cannot commit. Spot is cheaper still but can be interrupted, which is unacceptable for a steady production baseline that must stay up. A larger On-Demand instance changes size, not the pay-full-price problem. Predictable baseline usage means a commitment plan.

SAA-C03 Question 2 of 6

A nightly data-processing job is fault-tolerant, can be restarted, and can tolerate instances being reclaimed mid-run. The company wants the lowest possible compute price. Which option fits?

Answer: A — Spot Instances.

Spot Instances offer the deepest discount — up to about 90% — in exchange for being reclaimable with a short notice, which a fault-tolerant, restartable batch job can absorb. Why not the others: On-Demand pays full price for interruption tolerance the job does not need. Reserved Instances and a three-year Savings Plan lock in a commitment for a workload that runs only at night, wasting the reservation the rest of the time — and they cost more than Spot. Interruptible, fault-tolerant batch is the textbook Spot case.

SAA-C03 Question 3 of 6

A company wants commitment-level savings but needs the freedom to change instance families, sizes and Regions over time, and even to shift some workloads to AWS Fargate and Lambda. Which option gives savings with the most flexibility?

Answer: A — A Compute Savings Plan.

A Compute Savings Plan applies a discount for a spend commitment while letting you change instance family, size, Region and operating system freely, and it covers Fargate and Lambda too — the most flexible commitment option. Why not the others: a Standard Reserved Instance is locked to a specific instance type and Region, the opposite of the flexibility required. Spot gives no committed baseline and can be interrupted. On-Demand offers flexibility but no savings. Maximum flexibility with commitment savings is the Compute Savings Plan.

SAA-C03 Question 4 of 6

A short-term project runs for a few weeks with unpredictable, spiky demand, cannot commit to a term, and cannot tolerate interruptions. Which purchase option is appropriate?

Answer: A — On-Demand Instances.

On-Demand charges per use with no commitment and no interruption risk — the right fit for a short, unpredictable workload that cannot commit or be interrupted. Why not the others: a three-year Reserved Instance and a one-year Savings Plan both lock in commitments that outlast a few-week project. Spot is cheapest but can be reclaimed, which the 'cannot tolerate interruptions' requirement forbids. Short, unpredictable, non-interruptible, no commitment is On-Demand's exact niche.

SAA-C03 Question 5 of 6

Which workload is LEAST appropriate to run on Spot Instances?

Answer: A — A stateful production database that must stay available continuously.

Spot capacity can be reclaimed with about two minutes' notice, so it suits only interruption-tolerant work. A stateful production database that must stay continuously available is the worst fit — an interruption would take it down. Why not the others: stateless rendering with checkpoints, a fault-tolerant big-data cluster, and retryable build jobs all absorb interruptions gracefully, which is exactly what makes them good Spot candidates. If a workload cannot survive being reclaimed, it does not belong on Spot.

SAA-C03 Question 6 of 6

A company runs a consistent baseline on one instance family in a single Region, wants a deeper discount than a Compute Savings Plan offers, and is willing to give up cross-family flexibility to get it. Which option fits?

Answer: A — An EC2 Instance Savings Plan committed to that family and Region.

An EC2 Instance Savings Plan commits to a specific instance family in a chosen Region and, in exchange for that narrower scope, gives a deeper discount than the more flexible Compute Savings Plan — while still allowing size changes within the family. Why not the others: a Compute Savings Plan is more flexible but discounts less, which is what the requirement trades away. On-Demand offers no savings, and Spot cannot provide a guaranteed steady baseline. Deeper discount for a fixed family is the EC2 Instance Savings Plan.

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Frequently asked questions

How do the four EC2 pricing options map to workloads?

On-Demand for short, unpredictable, non-interruptible work with no commitment; Reserved Instances or Savings Plans for steady baseline usage you can commit to, at up to roughly 70% off; Spot for fault-tolerant, interruptible workloads at up to about 90% off. Match the workload's predictability and interruption tolerance to the option.

Savings Plan or Reserved Instance — which does the exam prefer?

Savings Plans are generally the more flexible, current recommendation: Compute Savings Plans flex across family, size, Region and even Fargate/Lambda, while EC2 Instance Savings Plans trade some flexibility for a deeper discount. Reserved Instances remain valid, especially when you need a capacity reservation in a specific Availability Zone.

Are these real exam questions?

No. They are original scenarios written for this page in the exam's style and difficulty. Reproducing real exam items violates the AWS certification agreement and can cost a candidate their certification — ours come with the reasoning attached instead.

What is the one-line takeaway?

Steady baseline → Savings Plan/Reserved; interruptible batch → Spot; short and unpredictable → On-Demand; and never put a workload that cannot be interrupted on Spot.

Updated for SAA-C03 (July 2026). The sample questions above are our own work in the style of the exam — not real exam items. The exam itself is set and marked by the certification body.