- A
Firestore
Firestore is serverless, auto-scaling, and pay-per-use, ideal for mobile apps.
- B
Cloud Spanner
Why wrong: Spanner is powerful but overkill and more expensive for a simple mobile app.
- C
Cloud SQL
Why wrong: Cloud SQL requires provisioning and managing instances; it does not auto-scale as seamlessly.
- D
Cloud Bigtable
Why wrong: Bigtable is designed for large-scale analytical workloads, not typical mobile app backends.
Question 876 of 1,000
PCDOE Manage Database Solutions Practice Question
This PCDOE practice question tests your understanding of manage database solutions. 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 application and needs a real-time database that automatically scales to handle sudden spikes in user traffic. They want to minimise operational overhead and only pay for the resources they use. Which Google Cloud database 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
✓
Firestore
Firestore is a fully managed, serverless NoSQL document database that automatically scales horizontally to handle sudden traffic spikes without manual intervention. It offers real-time data synchronization via listeners, and its pay-per-use billing model aligns with the startup's requirement to minimize operational overhead and only pay for consumed resources.
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.
- ✓
Firestore
Why this is correct
Firestore is serverless, auto-scaling, and pay-per-use, ideal for mobile apps.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Cloud Spanner
Why it's wrong here
Spanner is powerful but overkill and more expensive for a simple mobile app.
- ✗
Cloud SQL
Why it's wrong here
Cloud SQL requires provisioning and managing instances; it does not auto-scale as seamlessly.
- ✗
Cloud Bigtable
Why it's wrong here
Bigtable is designed for large-scale analytical workloads, not typical mobile app backends.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that Cloud Spanner is the best choice for any scalable database need, but candidates overlook that Spanner requires provisioned capacity and is not serverless, while Firestore's auto-scaling and pay-per-use model directly address the startup's requirements for minimizing operational overhead and handling sudden spikes.
Detailed technical explanation
How to think about this question
Firestore uses a distributed, multi-region replication architecture with automatic sharding and load balancing, enabling it to handle millions of concurrent connections without downtime. Its real-time listeners use gRPC streaming to push data changes to clients within milliseconds, which is critical for mobile apps requiring live updates. The pay-per-use model charges for reads, writes, deletes, and storage, with no minimum commitment, making it ideal for unpredictable traffic patterns.
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.
TExam Day Tips
- 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
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this PCDOE question test?
Manage Database Solutions — This question tests Manage Database Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Firestore — Firestore is a fully managed, serverless NoSQL document database that automatically scales horizontally to handle sudden traffic spikes without manual intervention. It offers real-time data synchronization via listeners, and its pay-per-use billing model aligns with the startup's requirement to minimize operational overhead and only pay for consumed resources.
What should I do if I get this PCDOE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jul 4, 2026
This PCDOE 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 PCDOE exam.
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