The answer is using flat-rate reservations for predictable workloads and setting a custom cost control (max bytes billed) to prevent runaway queries. Flat-rate reservations provide fixed pricing for steady BI workloads, eliminating the variable costs of on-demand pricing, while the max bytes billed setting acts as a hard cap on query processing, ensuring no single query exceeds your budget. On the Google Professional Cloud Database Engineer exam, this topic tests your ability to balance performance and cost in BigQuery, often appearing in scenario-based questions where you must choose between on-demand, flat-rate, and BI Engine pricing models. A common trap is assuming BI Engine always reduces costs—it actually adds reservation costs on top of compute. Another pitfall is thinking scheduled queries are inherently cheaper; they can inflate costs if not tuned. Remember the mnemonic “Flat and Cap” for flat-rate reservations and custom cost caps, as these two directly control spend without hidden fees.
PCDE Practice Question: Define data structures and implement SQL for Business Intelligence
This PCDE practice question tests your understanding of define data structures and implement sql for business intelligence. 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.
Which TWO are effective strategies to control costs when running BI queries on BigQuery? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set a maximum bytes billed limit for user projects.
Options C and D are correct. Setting a custom cost control (max bytes billed) prevents runaway queries. Using flat-rate reservations provides predictable pricing and can lower costs for steady workloads. Option A is wrong because scheduled queries add to cost if not optimized. Option B is wrong because enabling BI Engine incurs additional reservation costs. Option E is wrong because copying tables increases storage costs.
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.
✓
Set a maximum bytes billed limit for user projects.
Why this is correct
It prevents queries from scanning too much data.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create materialized copies of tables for each dashboard.
Why it's wrong here
Copies increase storage costs.
✗
Schedule queries to run every minute to keep the cache warm.
Why it's wrong here
Frequent queries increase slot consumption and costs.
✗
Enable BI Engine for all tables to speed up queries.
Why it's wrong here
BI Engine has its own cost and is not free.
✓
Use flat-rate reservations for predictable workloads.
Why this is correct
Reservations provide cost predictability and can be cheaper than on-demand.
Related concept
Read the scenario before looking for a memorised answer.
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 PCDE 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.
Define data structures and implement SQL for Business Intelligence — This question tests Define data structures and implement SQL for Business Intelligence — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set a maximum bytes billed limit for user projects. — Options C and D are correct. Setting a custom cost control (max bytes billed) prevents runaway queries. Using flat-rate reservations provides predictable pricing and can lower costs for steady workloads. Option A is wrong because scheduled queries add to cost if not optimized. Option B is wrong because enabling BI Engine incurs additional reservation costs. Option E is wrong because copying tables increases storage costs.
What should I do if I get this PCDE question wrong?
Identify which PCDE 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.
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Question Discussion
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