- A
Disable SSL encryption for database connections.
Why wrong: SSL adds a small overhead but is needed for security.
- B
Enable automatic connection management in the application driver.
Automatic pooling reduces connection creation.
- C
Use Cloud SQL Proxy or a connection pooler.
Connection poolers reuse connections.
- D
Increase the max_connections parameter.
Why wrong: This allows more connections but does not reduce overhead.
- E
Add a read replica to handle connect requests.
Why wrong: Read replicas do not reduce connection overhead.
Question 391 of 1,000
Reducing Connection Overhead in Cloud SQL for MySQL
This PCDE practice question tests your understanding of monitor and optimize database performance. 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.
Which TWO actions can help reduce connection overhead in a Cloud SQL for MySQL instance? (Choose two.)
Quick Answer
The answer is using Cloud SQL Proxy or a connection pooler, as both directly reduce database connection overhead in Cloud SQL for MySQL. A connection pooler, such as ProxySQL or the built-in Cloud SQL Proxy, maintains a persistent set of open connections to the database, so applications can reuse them instead of repeatedly opening and closing new connections—a process known as connection churn that consumes CPU and memory. On the Google Professional Cloud Database Engineer exam, this concept tests your understanding of operational efficiency: the exam often presents traps like “increase max connections” or “add read replicas,” which do not reduce overhead on the primary instance. A common memory tip is to think of a pooler as a “connection concierge” that keeps a ready queue, while SSL and read replicas serve security and read scaling, not overhead reduction. Remember: for overhead, pool it, don’t pile it.
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
✓
Enable automatic connection management in the application driver.
Option B is correct because enabling automatic connection management in the application driver (e.g., MySQL Connector/J with autoReconnect=true or HikariCP) allows the driver to reuse idle connections and transparently recover from broken connections, reducing the overhead of repeatedly establishing new TCP connections. Option C is correct because Cloud SQL Proxy or a connection pooler (like pgBouncer or ProxySQL) maintains a persistent pool of connections to the database, amortizing the cost of connection setup across multiple client requests and reducing the total number of concurrent connections to the instance.
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.
- ✗
Disable SSL encryption for database connections.
Why it's wrong here
SSL adds a small overhead but is needed for security.
- ✓
Enable automatic connection management in the application driver.
Why this is correct
Automatic pooling reduces connection creation.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Use Cloud SQL Proxy or a connection pooler.
Why this is correct
Connection poolers reuse connections.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Increase the max_connections parameter.
Why it's wrong here
This allows more connections but does not reduce overhead.
- ✗
Add a read replica to handle connect requests.
Why it's wrong here
Read replicas do not reduce connection overhead.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse increasing max_connections (a capacity setting) with reducing connection overhead, or they mistakenly think disabling SSL reduces overhead significantly, when in reality the overhead of SSL is minor compared to the cost of establishing a new connection from scratch.
Detailed technical explanation
How to think about this question
Connection overhead in Cloud SQL for MySQL primarily stems from TCP three-way handshake, authentication (including SSL/TLS negotiation), and session initialization (e.g., setting session variables, charset). Connection poolers like ProxySQL maintain a persistent backend pool and multiplex client connections, reducing the per-connection cost to a lightweight frontend handshake. In high-traffic applications, even a 10ms connection setup time per request can cause significant latency under load, making connection pooling a critical optimization.
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.
Visual reference
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.
- →
Monitor and optimize database performance — study guide chapter
Learn the concepts, then practise the questions
- →
Monitor and optimize database performance practice questions
Targeted practice on this topic area only
- →
All PCDE questions
1,000 questions across all exam domains
- →
Google Professional Cloud Database Engineer study guide
Full concept coverage aligned to exam objectives
- →
PCDE practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related PCDE practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Building and Implementing CI/CD Pipelines for a Service practice questions
Practise PCDE questions linked to Building and Implementing CI/CD Pipelines for a Service.
Bootstrapping a Google Cloud Organisation for DevOps practice questions
Practise PCDE questions linked to Bootstrapping a Google Cloud Organisation for DevOps.
Applying Site Reliability Engineering Practices to a Service practice questions
Practise PCDE questions linked to Applying Site Reliability Engineering Practices to a Service.
Implementing Service Monitoring Strategies practice questions
Practise PCDE questions linked to Implementing Service Monitoring Strategies.
Optimising Service Performance practice questions
Practise PCDE questions linked to Optimising Service Performance.
Plan and manage database infrastructure practice questions
Practise PCDE questions linked to Plan and manage database infrastructure.
Define data structures and implement SQL for Business Intelligence practice questions
Practise PCDE questions linked to Define data structures and implement SQL for Business Intelligence.
Design and implement database schemas practice questions
Practise PCDE questions linked to Design and implement database schemas.
Monitor and optimize database performance practice questions
Practise PCDE questions linked to Monitor and optimize database performance.
PCDE fundamentals practice questions
Practise PCDE questions linked to PCDE fundamentals.
PCDE scenario practice questions
Practise PCDE questions linked to PCDE scenario.
PCDE troubleshooting practice questions
Practise PCDE questions linked to PCDE troubleshooting.
Practice this exam
Start a free PCDE practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this PCDE question test?
Monitor and optimize database performance — This question tests Monitor and optimize database performance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable automatic connection management in the application driver. — Option B is correct because enabling automatic connection management in the application driver (e.g., MySQL Connector/J with autoReconnect=true or HikariCP) allows the driver to reuse idle connections and transparently recover from broken connections, reducing the overhead of repeatedly establishing new TCP connections. Option C is correct because Cloud SQL Proxy or a connection pooler (like pgBouncer or ProxySQL) maintains a persistent pool of connections to the database, amortizing the cost of connection setup across multiple client requests and reducing the total number of concurrent connections to the instance.
What should I do if I get this PCDE 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
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
More PCDE practice questions
- A company stores sensor data in BigQuery. They have a table 'sensor_readings' with columns: sensor_id, reading_time, val…
- Which THREE are valid considerations when designing BigQuery tables for BI reporting?
- A company uses Cloud Build to build Docker images. They want to cache intermediate layers to speed up subsequent builds.…
- A company is adopting GitOps for their GKE clusters using Config Sync. They need to meet the following requirements: (1)…
- A team is migrating an on-premises PostgreSQL database to Cloud SQL for PostgreSQL. The existing schema uses a large num…
- A DevOps engineer is setting up Docker credential helper for Artifact Registry on a Cloud Build worker. They want the bu…
Last reviewed: Jul 4, 2026
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.