The answer is to use preemptible VMs and design the job to handle interruptions gracefully. This is correct because preemptible VMs offer a 60-80% cost reduction compared to standard instances, making them the ideal choice for batch workload cost optimization on Compute Engine. Since the batch processing runs for only three hours nightly, it can tolerate the 24-hour maximum lifespan of a preemptible VM, but must be built with checkpointing logic to resume from the last saved state if the VM is terminated early. On the Google Professional Cloud DevOps Engineer exam, this scenario tests your understanding of balancing cost and reliability for fault-tolerant, interruptible workloads—a common trap is choosing standard VMs for “reliability” without recognizing that graceful interruption handling is the key to both cost savings and job completion. Remember the mnemonic: “Preempt for price, checkpoint to complete.”
PCDOE Managing Google Cloud costs Practice Question
This PCDOE practice question tests your understanding of managing google cloud costs. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company runs a batch processing workload on Compute Engine that runs for 3 hours every night. They want to minimize costs while ensuring the job completes reliably. Which recommendation should they follow?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use preemptible VMs and design the job to handle interruptions gracefully.
Preemptible VMs cost about 60-80% less than standard VMs and are ideal for batch workloads that can tolerate interruptions. Since the job runs for only 3 hours nightly, it can be designed to checkpoint progress and restart from the last checkpoint if a preemptible VM is terminated (which can happen at any time within 24 hours). This minimizes cost while ensuring reliability through graceful interruption handling.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Use sole-tenant nodes to isolate the workload.
Why it's wrong here
Sole-tenant nodes are for compliance or licensing, not cost savings.
✗
Use standard (on-demand) VMs and enable sustained use discounts.
Why it's wrong here
Sustained use discounts require running for a month; nightly 3-hour jobs don't benefit much.
✓
Use preemptible VMs and design the job to handle interruptions gracefully.
Why this is correct
Preemptible VMs are up to 60% cheaper and suitable for fault-tolerant batch jobs.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Purchase 1-year committed use discounts for the VMs.
Why it's wrong here
Committed use discounts require a 1-year commitment and are not cost-effective for short nightly jobs.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may choose sustained use discounts (Option B) thinking they apply to any usage pattern, but they actually require sustained usage over a month (e.g., 25% of a month) to trigger, which a 3-hour nightly job does not meet.
Detailed technical explanation
How to think about this question
Preemptible VMs are Compute Engine instances that last up to 24 hours but can be terminated at any time with a 30-second notice. For batch workloads, implementing checkpointing (e.g., saving state to persistent disk or Cloud Storage) allows the job to resume from the last checkpoint when a new preemptible VM is provisioned. Google Cloud also offers 'preemptible VM pricing' with no SLA, making them unsuitable for production workloads that cannot tolerate interruptions, but perfect for fault-tolerant batch processing.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Managing Google Cloud costs — This question tests Managing Google Cloud costs — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use preemptible VMs and design the job to handle interruptions gracefully. — Preemptible VMs cost about 60-80% less than standard VMs and are ideal for batch workloads that can tolerate interruptions. Since the job runs for only 3 hours nightly, it can be designed to checkpoint progress and restart from the last checkpoint if a preemptible VM is terminated (which can happen at any time within 24 hours). This minimizes cost while ensuring reliability through graceful interruption handling.
What should I do if I get this PCDOE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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