- A
Configure the Cloud SQL Auth Proxy to use private IP and increase pool size
Why wrong: Cloud SQL Auth Proxy does not have a configurable pool size for connections; it proxies each connection individually.
- B
Upgrade the Cloud SQL instance to a higher tier with more connections
Why wrong: Higher tiers increase connection limits but also cost. They do not solve the problem of connection churn and may be less cost-effective than pooling.
- C
Increase the number of Cloud SQL Auth Proxy replicas
Why wrong: Auth proxy replicas still each hold connections to the database; they don't pool connections across instances. They also add complexity and cost.
- D
Use a connection pooler such as ProxySQL deployed in the GKE cluster
ProxySQL pools connections to the database, allowing many application connections to be multiplexed over fewer database connections, reducing load on the database and avoiding connection limits.
Google PCA Practice Question: Analysing and Optimising Technical and Business Processes
This PCA practice question tests your understanding of analysing and optimising technical and business processes. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 company runs a global e-commerce platform on Google Kubernetes Engine (GKE) with a Cloud SQL for MySQL database. During promotions, traffic spikes cause database connection limits to be exceeded, leading to errors. The application uses the Cloud SQL Auth Proxy. What is the MOST scalable and cost-effective solution?
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
Use a connection pooler such as ProxySQL deployed in the GKE cluster
Connection pooling (e.g., using PgBouncer for PostgreSQL, but for MySQL, similar poolers like ProxySQL or built-in connection pooling) allows the application to reuse connections and handle many concurrent requests without hitting database connection limits. Increasing the database tier or proxy instances adds cost and may not address the underlying issue of connection churn.
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.
- ✗
Configure the Cloud SQL Auth Proxy to use private IP and increase pool size
Why it's wrong here
Cloud SQL Auth Proxy does not have a configurable pool size for connections; it proxies each connection individually.
- ✗
Upgrade the Cloud SQL instance to a higher tier with more connections
Why it's wrong here
Higher tiers increase connection limits but also cost. They do not solve the problem of connection churn and may be less cost-effective than pooling.
- ✗
Increase the number of Cloud SQL Auth Proxy replicas
Why it's wrong here
Auth proxy replicas still each hold connections to the database; they don't pool connections across instances. They also add complexity and cost.
- ✓
Use a connection pooler such as ProxySQL deployed in the GKE cluster
Why this is correct
ProxySQL pools connections to the database, allowing many application connections to be multiplexed over fewer database connections, reducing load on the database and avoiding connection limits.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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.
What to study next
Got this wrong? Here's your next step.
Identify which PCA exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Questions learners often ask
What does this PCA question test?
Analysing and Optimising Technical and Business Processes — This question tests Analysing and Optimising Technical and Business Processes — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use a connection pooler such as ProxySQL deployed in the GKE cluster — Connection pooling (e.g., using PgBouncer for PostgreSQL, but for MySQL, similar poolers like ProxySQL or built-in connection pooling) allows the application to reuse connections and handle many concurrent requests without hitting database connection limits. Increasing the database tier or proxy instances adds cost and may not address the underlying issue of connection churn.
What should I do if I get this PCA question wrong?
Identify which PCA exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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 PCA 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 PCA exam.
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