Google PCA Practice Question: Analyze and optimize technical and business processes
This PCA practice question tests your understanding of analyze and optimize 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 uses BigQuery for analytics and has a large number of ad-hoc queries from different teams. Costs are rising unpredictably. They want to control costs while maintaining query performance. What should they do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Purchase flat-rate slots and assign them to a reservation for each team.
Option D is correct because purchasing flat-rate slots and assigning them to a reservation for each team provides predictable, fixed-cost capacity for BigQuery. This eliminates the unpredictability of on-demand pricing while allowing teams to share a dedicated pool of slots, ensuring consistent query performance without unexpected cost spikes.
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 partitioning and clustering to reduce data scanned.
Why it's wrong here
This reduces cost but doesn't cap spending.
✗
Reduce the number of slots available to each team.
Why it's wrong here
Would increase query times.
✗
Require each team to include a cost code in their queries.
Why it's wrong here
Doesn't control costs, just tracks them.
✓
Purchase flat-rate slots and assign them to a reservation for each team.
Why this is correct
Flat-rate provides predictable cost and performance isolation.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that performance optimization techniques (like partitioning/clustering) alone can control costs, when in fact they only reduce per-query data scanned but do not cap total spending under on-demand pricing.
Detailed technical explanation
How to think about this question
BigQuery flat-rate slots are purchased in increments of 100 or 500 slots (or via annual commitments) and are assigned to reservations using the reservation API or admin console. Reservations can be flexibly shared across teams using idle slot management, where unused slots from one reservation can be borrowed by another, maximizing utilization while keeping costs fixed. In a real-world scenario, a company with 500 flat-rate slots can create separate reservations for different teams (e.g., 200 for analytics, 300 for data science) and still allow idle slots to be used by other teams, ensuring performance without over-provisioning.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
Analyze and optimize technical and business processes — This question tests Analyze and optimize 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: Purchase flat-rate slots and assign them to a reservation for each team. — Option D is correct because purchasing flat-rate slots and assigning them to a reservation for each team provides predictable, fixed-cost capacity for BigQuery. This eliminates the unpredictability of on-demand pricing while allowing teams to share a dedicated pool of slots, ensuring consistent query performance without unexpected cost spikes.
What should I do if I get this PCA question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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