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ACE Practice Question: Your Cloud SQL for MySQL primary instance in…
This ACE practice question tests your understanding of your cloud sql for mysql primary instance in…. 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.
Your Cloud SQL for MySQL primary instance in `us-central1` has failed. Cloud SQL HA automatically fails over to the standby. After the failover, your application is experiencing intermittent connection errors. What is the most likely cause and solution?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
Application connection pools hold stale connections to the failed primary; configure pools to validate connections and reconnect after failure.
Stale connection pool entries are the most common cause of post-failover errors. Configuring connection validation on borrow and using the Cloud SQL Auth Proxy (which handles reconnection transparently) resolves this.
B
Distractor review
The MySQL binary log is incomplete after failover; run `mysqlcheck` to repair tables.
Cloud SQL HA uses synchronous replication, ensuring the standby has all committed transactions before failover. Table repair is not needed.
C
Distractor review
The standby instance has a different IP address; update the connection string.
Cloud SQL HA failover preserves the same instance IP address — the application connection string doesn't need to change for IP.
D
Distractor review
The standby replica must be manually promoted before it can accept connections.
Cloud SQL HA failover is automatic — the standby is automatically promoted and begins accepting connections without manual intervention.
Common exam trap
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.
Technical deep dive
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.
Related practice questions
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Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
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Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
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FAQ
Questions learners often ask
What does this ACE question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: Application connection pools hold stale connections to the failed primary; configure pools to validate connections and reconnect after failure. — During Cloud SQL HA failover, the IP address of the instance remains the same (it's assigned to the new primary), but the underlying connection is interrupted. Application connection pools hold stale TCP connections to the failed primary. After failover, these stale connections return errors until the pool reconnects. Applications should configure connection pool settings to: 1) Detect broken connections quickly, 2) Enable connection validation on borrow, and 3) Use exponential backoff for reconnection. Using the Cloud SQL Auth Proxy also helps, as it handles reconnection automatically.
What should I do if I get this ACE question wrong?
Identify which ACE 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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