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PCDE Practice Question: Design innovative, scalable, and highly available cloud database solutions
A company is designing a database solution for a global social media application that requires strong consistency, high write throughput, and complex relational queries. Which TWO Google Cloud databases should they consider? (Choose 2)
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 Spanner
Cloud Spanner provides global strong consistency and relational support. AlloyDB offers strong consistency and high performance for relational workloads. Bigtable is eventually consistent. BigQuery is analytical. Firestore is not globally consistent.
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 Bigtable
Why it's wrong here
Bigtable is eventually consistent.
- ✗
BigQuery
Why it's wrong here
BigQuery is analytical, not transactional.
- ✓
Cloud Spanner
Why this is correct
Spanner is globally distributed, strongly consistent, and relational.
- ✗
Firestore
Why it's wrong here
Firestore is not globally consistent and lacks complex relational queries.
- ✓
AlloyDB for PostgreSQL
Why this is correct
AlloyDB provides strong consistency and relational capabilities with high write throughput.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.