Google ACE Planning and Configuring a Cloud Solution Practice Question
An organization needs a NoSQL document database with real-time synchronization across multiple client devices. Which Google Cloud service should they use?
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 a NoSQL document database that provides real-time listeners for syncing data across devices, making it ideal for mobile and web applications requiring live 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 this is correct
Firestore is a fully managed NoSQL document database that stores data in documents organized into collections. It provides built-in real-time synchronization through client-side listeners, automatically pushing updates to subscribed apps whenever data changes, making it ideal for live, collaborative applications. It also includes offline support and strong consistency, which are key differentiators for real-time use cases.
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Cloud SQL
Why it's wrong here
Cloud SQL is a fully managed relational database service supporting MySQL, PostgreSQL, and SQL Server. Its schema-based tables and SQL queries are fundamentally incompatible with the flexible document model, and it lacks native client-side real-time synchronization—delivering real-time updates would require additional infrastructure like Pub/Sub or custom polling logic, making it a poor fit for this requirement.
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Cloud Bigtable
Why it's wrong here
Cloud Bigtable is a wide-column NoSQL database designed for large-scale analytical and operational workloads, storing data in sparse tables with row keys. Although it is NoSQL and can ingest millions of writes per second, it does not use a document-oriented data model and offers no client-side real-time synchronization; it is optimized for batch and streaming analytics rather than live document sync to end users.
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Cloud Datastore
Why it's wrong here
Cloud Datastore is the original NoSQL document database from Google, sharing a similar hierarchical model of kinds and entities with Firestore. However, it is the predecessor to Firestore and lacks real-time synchronization, providing only eventual consistency and requiring manual polling or external mechanisms to detect changes. Firestore evolved from Datastore specifically to add real-time listeners, stronger consistency, and a richer query experience, making Datastore an outdated choice for real-time needs.
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Related to this question
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Google Cloud Platform Overview
Key term
Service
A service is a software component or system that performs a specific function and is available to be used by other programs or users over a network.
Key term
Organization
An Organization is a top-level container in Google Cloud that represents your company or entities and serves as the root node for all your cloud resources, policies, and access control.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This ACE 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 ACE exam.