- A
Reconfigure the instance to a multi-region configuration with default leader in us-central1.
Why wrong: Leader remains in US, so European users still experience latency for writes and strong reads.
- B
Reconfigure the instance to a multi-region configuration with default leader in europe-west1.
Multi-region configuration places a leader in Europe, reducing write and strong read latency for European users.
- C
Add a read-only regional replica in europe-west1.
Why wrong: Read replicas serve stale reads; strong reads still go to the leader region.
- D
Increase the number of nodes to improve throughput and automatically reduce latency.
Why wrong: More nodes improve throughput but not geographical latency.
Question 254 of 1,000
PCDE Plan and manage database infrastructure Practice Question
This PCDE practice question tests your understanding of plan and manage database infrastructure. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 is designing a Cloud Spanner database for a global financial application. They need to minimize latency for customer queries while handling write-heavy workloads. The current design uses a single-region instance in us-central1. Which approach should they take to reduce latency for users in Europe?
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 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
✓
Reconfigure the instance to a multi-region configuration with default leader in europe-west1.
To reduce latency for users in Europe, the database must have a write-capable replica close to them. A multi-region configuration with the default leader in europe-west1 ensures that writes are committed in Europe, minimizing write latency for European users. Read-only replicas (Option C) cannot handle writes, so they do not reduce write latency.
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.
- ✗
Reconfigure the instance to a multi-region configuration with default leader in us-central1.
Why it's wrong here
Leader remains in US, so European users still experience latency for writes and strong reads.
- ✓
Reconfigure the instance to a multi-region configuration with default leader in europe-west1.
Why this is correct
Multi-region configuration places a leader in Europe, reducing write and strong read latency for European users.
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.
- ✗
Add a read-only regional replica in europe-west1.
Why it's wrong here
Read replicas serve stale reads; strong reads still go to the leader region.
- ✗
Increase the number of nodes to improve throughput and automatically reduce latency.
Why it's wrong here
More nodes improve throughput but not geographical latency.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that adding read replicas or increasing nodes can reduce write latency in Cloud Spanner. In reality, only moving the default leader to the region where writes originate minimizes write latency for that region.
Detailed technical explanation
How to think about this question
Cloud Spanner multi-region configurations use a default leader region that determines where all writes are committed via Paxos consensus. By setting the default leader to europe-west1, all write quorums are formed in Europe, reducing write latency for European clients. Read-only replicas serve reads with minimal staleness but cannot participate in writes, making them unsuitable for write-heavy workloads.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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.
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FAQ
Questions learners often ask
What does this PCDE question test?
Plan and manage database infrastructure — This question tests Plan and manage database infrastructure — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Reconfigure the instance to a multi-region configuration with default leader in europe-west1. — To reduce latency for users in Europe, the database must have a write-capable replica close to them. A multi-region configuration with the default leader in europe-west1 ensures that writes are committed in Europe, minimizing write latency for European users. Read-only replicas (Option C) cannot handle writes, so they do not reduce write latency.
What should I do if I get this PCDE 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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Last reviewed: Jul 4, 2026
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