Google PCA Practice Question: Designing and Planning a Cloud Solution Architecture
This PCA practice question tests your understanding of designing and planning a cloud solution architecture. 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 startup is building a mobile app backend that requires real-time data synchronization across multiple users. They need a fully managed, serverless NoSQL database that scales automatically and supports offline persistence. Which database should they choose?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Cloud Firestore
Firestore is a serverless NoSQL document database designed for mobile apps with real-time sync, offline support, and automatic scaling. Cloud Bigtable is for high-throughput time-series data, not mobile. Cloud SQL is relational and not serverless. Cloud Spanner is globally distributed relational, overkill for a mobile app backend.
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.
✗
Cloud Spanner
Why it's wrong here
Spanner is a globally distributed relational database, overkill and expensive for a typical mobile backend.
✗
Cloud Bigtable
Why it's wrong here
Bigtable is a wide-column NoSQL for time-series and high-throughput workloads, not designed for mobile real-time sync.
✗
Cloud SQL
Why it's wrong here
Cloud SQL is a relational database, not serverless, and lacks built-in real-time sync.
✓
Cloud Firestore
Why this is correct
Firestore provides real-time updates, offline persistence, and automatic scaling, making it ideal for mobile app backends.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
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.
Designing and Planning a Cloud Solution Architecture — This question tests Designing and Planning a Cloud Solution Architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Cloud Firestore — Firestore is a serverless NoSQL document database designed for mobile apps with real-time sync, offline support, and automatic scaling. Cloud Bigtable is for high-throughput time-series data, not mobile. Cloud SQL is relational and not serverless. Cloud Spanner is globally distributed relational, overkill for a mobile app backend.
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.
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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.
Question Discussion
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