PCDE Practice Question: Manage a solution that can span multiple database technologies

A company is designing a mobile application backend that requires real-time synchronization across users and offline support. Which Google Cloud database service is most suitable?

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

✓

Firestore

Firestore is designed for real-time sync, offline support, and mobile/web applications. It provides real-time listeners and offline data persistence.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
Bigtable
Why it's wrong here
Bigtable is not suitable for mobile apps with offline support.
✗
Cloud SQL
Why it's wrong here
Cloud SQL does not provide real-time sync or offline capabilities.
✗
Cloud Spanner
Why it's wrong here
Spanner is not designed for offline support or real-time sync out of the box.
✓
Firestore
Why this is correct
Correct. Firestore offers real-time listeners and offline data persistence.

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Last reviewed: Jul 4, 2026

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