CV0-004 Cloud Architecture and Design Practice Question
A company wants to reduce cloud costs for a stateless batch processing workload that runs nightly for about 3 hours. The workload can tolerate interruptions. Which pricing model is most cost-effective?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Spot instances
Spot instances are the most cost-effective because they offer deep discounts (up to 90%) for interruptible workloads. The workload is stateless, runs for only 3 hours nightly, and can tolerate interruptions, making it an ideal fit for spot instances. Reserved instances require a long-term commitment and provide capacity for steady-state usage, resulting in paying for 24/7 capacity for a workload that only needs 3 hours daily.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Reserved instances
Why it's wrong here
Reserved instances are not cost-effective here because they are designed for always-on workloads and require a 1- or 3-year commitment, leading to paying for unused hours for a 3-hour daily workload.
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Dedicated hosts
Why it's wrong here
Dedicated hosts provide physical servers for regulatory or licensing requirements, not cost savings for interruptible batch jobs.
- ✓
Spot instances
Why this is correct
Correct. Spot instances offer the lowest cost and are ideal for fault-tolerant, stateless workloads like this nightly batch process.
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On-demand instances
Why it's wrong here
On-demand instances have no commitment but are more expensive than spot instances for this workload.
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