Question 457 of 1,446
Design innovative, scalable, and highly available cloud database solutions →easyMultiple ChoiceObjective-mapped
PCDE Practice Question: Design innovative, scalable, and highly available cloud database solutions
A startup is building a mobile app backend with high-concurrency user authentication and profile updates. They need strong consistency and ACID transactions. Which database service should they choose?
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
✓
Cloud SQL
Cloud SQL provides fully managed relational databases with ACID compliance, suitable for high-concurrency OLTP workloads like user authentication and profile updates.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Firestore
Why it's wrong here
Firestore offers strong consistency but is document-oriented; not ideal for complex relational data.
- ✗
BigQuery
Why it's wrong here
BigQuery is an analytics data warehouse, not designed for transactional workloads.
- ✗
Cloud Bigtable
Why it's wrong here
Bigtable is a NoSQL database without ACID transactions across rows; it's for time-series or high-throughput key-value.
- ✓
Cloud SQL
Why this is correct
Cloud SQL (MySQL/PostgreSQL) supports ACID, strong consistency, and high concurrency for OLTP.
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Last reviewed: Jul 4, 2026
This PCDE 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 PCDE exam.
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