- A
Partitioned read
Why wrong: Partitioned read is for large data export, not for low-latency point reads.
- B
Read with a timestamp bound exactly 10 seconds in the past
Why wrong: This is a timestamp-bound stale read, but the question asks for tolerance up to 10 seconds, not exactly 10 seconds; bounded staleness is more flexible and performant.
- C
Strong read
Why wrong: Strong reads guarantee consistency but are slower as they must contact the leader.
- D
Stale read with a staleness bound of 10 seconds
Correct: allows reading from any replica, improving performance while guaranteeing data is at most 10 seconds old.
Question 784 of 980
PCD Practice Question: Design Scalable and Highly Available Cloud Database Solutions
This PCD practice question tests your understanding of design scalable and highly available cloud database solutions. 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.
You are using Cloud Spanner and need to read data that is consistent as of a specific point in time, but you can tolerate staleness up to 10 seconds. Which read type should you use to achieve the best performance?
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
✓
Stale read with a staleness bound of 10 seconds
Option D is correct because a stale read with a staleness bound of 10 seconds allows Cloud Spanner to serve the read from any replica that has data within that staleness window, avoiding the latency of a strong read that must contact the leader. This provides the best performance while still guaranteeing consistency as of a point in time up to 10 seconds ago, meeting the requirement of tolerating staleness up to 10 seconds.
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.
- ✗
Partitioned read
Why it's wrong here
Partitioned read is for large data export, not for low-latency point reads.
- ✗
Read with a timestamp bound exactly 10 seconds in the past
Why it's wrong here
This is a timestamp-bound stale read, but the question asks for tolerance up to 10 seconds, not exactly 10 seconds; bounded staleness is more flexible and performant.
- ✗
Strong read
Why it's wrong here
Strong reads guarantee consistency but are slower as they must contact the leader.
- ✓
Stale read with a staleness bound of 10 seconds
Why this is correct
Correct: allows reading from any replica, improving performance while guaranteeing data is at most 10 seconds old.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between an exact timestamp bound and a staleness bound, where candidates mistakenly choose the exact timestamp bound thinking it provides more precise control, but the staleness bound actually offers better performance by allowing Cloud Spanner to select the most convenient replica within the allowed window.
Detailed technical explanation
How to think about this question
Under the hood, Cloud Spanner uses TrueTime to assign timestamps to transactions, and a stale read with a staleness bound leverages the fact that any replica whose data is within the bound can serve the read without contacting the leader. This reduces read latency and distributes load across replicas, which is critical for globally distributed applications where strong reads would otherwise incur cross-region round trips. In a real-world scenario, a reporting dashboard that can tolerate 10-second-old data would benefit from this approach to avoid impacting write-heavy transactional 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.
- →
Design Scalable and Highly Available Cloud Database Solutions — study guide chapter
Learn the concepts, then practise the questions
- →
Design Scalable and Highly Available Cloud Database Solutions practice questions
Targeted practice on this topic area only
- →
All PCD questions
980 questions across all exam domains
- →
Google Professional Cloud Developer study guide
Full concept coverage aligned to exam objectives
- →
PCD practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related PCD practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Manage a Solution that Can Span Multiple Database Systems practice questions
Practise PCD questions linked to Manage a Solution that Can Span Multiple Database Systems.
Deploy Scalable and Highly Available Databases in Google Cloud practice questions
Practise PCD questions linked to Deploy Scalable and Highly Available Databases in Google Cloud.
Design Scalable and Highly Available Cloud Database Solutions practice questions
Practise PCD questions linked to Design Scalable and Highly Available Cloud Database Solutions.
Migrate Data Solutions practice questions
Practise PCD questions linked to Migrate Data Solutions.
Designing highly scalable, available, and reliable cloud-native applications practice questions
Practise PCD questions linked to Designing highly scalable, available, and reliable cloud-native applications.
Building and testing applications practice questions
Practise PCD questions linked to Building and testing applications.
Deploying applications practice questions
Practise PCD questions linked to Deploying applications.
Integrating Google Cloud services practice questions
Practise PCD questions linked to Integrating Google Cloud services.
Managing application performance monitoring practice questions
Practise PCD questions linked to Managing application performance monitoring.
PCD fundamentals practice questions
Practise PCD questions linked to PCD fundamentals.
PCD scenario practice questions
Practise PCD questions linked to PCD scenario.
PCD troubleshooting practice questions
Practise PCD questions linked to PCD troubleshooting.
Practice this exam
Start a free PCD practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this PCD question test?
Design Scalable and Highly Available Cloud Database Solutions — This question tests Design Scalable and Highly Available Cloud Database Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Stale read with a staleness bound of 10 seconds — Option D is correct because a stale read with a staleness bound of 10 seconds allows Cloud Spanner to serve the read from any replica that has data within that staleness window, avoiding the latency of a strong read that must contact the leader. This provides the best performance while still guaranteeing consistency as of a point in time up to 10 seconds ago, meeting the requirement of tolerating staleness up to 10 seconds.
What should I do if I get this PCD 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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jul 4, 2026
This PCD 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 PCD exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.