- A
Use Editions with a baseline of reserved slots for scheduled queries and allow autoscaling for ad-hoc
Editions allow reserving slots for predictable workloads and autoscaling for spikes, optimising cost and performance.
- B
On-demand pricing
Why wrong: On-demand pricing charges per query. For predictable queries, costs can be high compared to flat-rate for steady usage.
- C
Use committed use discounts on slots
Why wrong: Committed use discounts apply to slot reservations but don't differentiate between scheduled and ad-hoc. They are an add-on to pricing models, not a pricing model themselves.
- D
Flat-rate pricing (slot reservations) for all queries
Why wrong: Flat-rate pricing is cost-effective for large steady usage, but if ad-hoc queries are infrequent, unused slots are wasted.
Google PCA Practice Question: Analysing and Optimising Technical and Business Processes
This PCA practice question tests your understanding of analysing and optimising technical and business processes. 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 wants to optimise costs for their BigQuery workloads. They have a predictable set of queries that run every hour, with occasional ad-hoc queries from analysts. They want to reduce the cost of the scheduled queries while keeping the ad-hoc queries cost-effective. Which pricing model should they choose?
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
Use Editions with a baseline of reserved slots for scheduled queries and allow autoscaling for ad-hoc
BigQuery slot reservations (editions) allow allocating dedicated slots for predictable workloads, with separate pricing for ad-hoc queries (on-demand). Flat-rate pricing is cheaper for large steady-state usage but may waste slots during idle time. On-demand is pay-per-query; for predictable queries, it may be expensive. The best approach is to use a hybrid: reserved slots for scheduled queries and on-demand for ad-hoc.
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 Editions with a baseline of reserved slots for scheduled queries and allow autoscaling for ad-hoc
Why this is correct
Editions allow reserving slots for predictable workloads and autoscaling for spikes, optimising cost and performance.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
On-demand pricing
Why it's wrong here
On-demand pricing charges per query. For predictable queries, costs can be high compared to flat-rate for steady usage.
- ✗
Use committed use discounts on slots
Why it's wrong here
Committed use discounts apply to slot reservations but don't differentiate between scheduled and ad-hoc. They are an add-on to pricing models, not a pricing model themselves.
- ✗
Flat-rate pricing (slot reservations) for all queries
Why it's wrong here
Flat-rate pricing is cost-effective for large steady usage, but if ad-hoc queries are infrequent, unused slots are wasted.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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 PCA exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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Analysing and Optimising Technical and Business Processes — study guide chapter
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FAQ
Questions learners often ask
What does this PCA question test?
Analysing and Optimising Technical and Business Processes — This question tests Analysing and Optimising Technical and Business Processes — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use Editions with a baseline of reserved slots for scheduled queries and allow autoscaling for ad-hoc — BigQuery slot reservations (editions) allow allocating dedicated slots for predictable workloads, with separate pricing for ad-hoc queries (on-demand). Flat-rate pricing is cheaper for large steady-state usage but may waste slots during idle time. On-demand is pay-per-query; for predictable queries, it may be expensive. The best approach is to use a hybrid: reserved slots for scheduled queries and on-demand for ad-hoc.
What should I do if I get this PCA question wrong?
Identify which PCA exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jul 4, 2026
This PCA practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCA exam.
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