The correct action is to check Amazon CloudWatch metrics for Database Connections and Latency, and verify DNS resolution. After an RDS MySQL failover, the DNS record updates to point to the new primary instance, but application-side DNS caching can cause clients to continue connecting to the old, now-unreachable endpoint, resulting in connection timeouts and increased latency. By examining CloudWatch metrics, you can confirm whether connection counts dropped or latency spiked at the failover moment, while verifying DNS resolution reveals if cached records are directing traffic incorrectly. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of how Multi-AZ failover interacts with application connectivity—a common trap is assuming a reboot or restore is needed when the real issue is stale DNS. Remember the memory tip: after a failover, always think “DNS first, not reboot or restore.”
DBS-C01 Management and Operations Practice Question
This DBS-C01 practice question tests your understanding of management and operations. 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 is using Amazon RDS for MySQL with Multi-AZ deployment. The database experiences a failover event, and after failover, the application reports increased latency. Which action should the database specialist take to diagnose the issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Check Amazon CloudWatch metrics for Database Connections and Latency, and verify DNS resolution.
Option B is correct because after a failover, the DNS record is updated to point to the new primary, but the application may be using cached DNS. Checking CloudWatch metrics for connection counts and latency can help identify the issue. Option A is wrong because forcing a reboot would not resolve DNS caching. Option C is wrong because RDS manages the secondary instance automatically. Option D is wrong because restoring from backup is unnecessary.
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.
✓
Check Amazon CloudWatch metrics for Database Connections and Latency, and verify DNS resolution.
Why this is correct
Monitoring metrics and DNS can pinpoint the cause of increased latency.
Related concept
Read the scenario before looking for a memorised answer.
✗
Promote the secondary instance to primary manually.
Why it's wrong here
Multi-AZ failover is automatic; manual promotion is not needed.
✗
Create a new read replica and redirect traffic.
Why it's wrong here
A read replica does not resolve the latency issue from DNS caching.
✗
Force a reboot of the DB instance to reset connections.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Identify which DBS-C01 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.
Management and Operations — This question tests Management and Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Check Amazon CloudWatch metrics for Database Connections and Latency, and verify DNS resolution. — Option B is correct because after a failover, the DNS record is updated to point to the new primary, but the application may be using cached DNS. Checking CloudWatch metrics for connection counts and latency can help identify the issue. Option A is wrong because forcing a reboot would not resolve DNS caching. Option C is wrong because RDS manages the secondary instance automatically. Option D is wrong because restoring from backup is unnecessary.
What should I do if I get this DBS-C01 question wrong?
Identify which DBS-C01 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.
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Question Discussion
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