The answer is a Multi-AZ failover at 14:25 UTC, which caused a brief application outage. This is correct because a Multi-AZ failover involves promoting the standby replica to primary, which requires terminating the existing DNS connection and re-establishing it to the new instance, typically causing a 60–120 second interruption. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your ability to distinguish failover events from other RDS events like maintenance windows or storage issues; a common trap is misreading the 14:30 restart as the cause rather than the effect of the failover. Remember that in the event log, a failover event appears as a "Multi-AZ failover" or "DB instance restarted" message, but the outage timestamp aligns with the failover initiation, not the subsequent restart. A useful memory tip: "Failover first, restart follows"—the outage occurs during the DNS flip, not the reboot.
DBS-C01 Monitoring and Troubleshooting Practice Question
This DBS-C01 practice question tests your understanding of monitoring and troubleshooting. 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.
Network Topology
Refer to the exhibit. A database specialist is investigating an application outage that occurred at 14:25 UTC. The RDS event log shows the events above. What is the most likely cause of the outage?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A Multi-AZ failover occurred at 14:25 UTC, causing a brief outage.
Option A is correct because a Multi-AZ failover can cause a brief outage during the transition. The restart at 14:30 is likely the result of the failover. Option B is wrong because the restart occurred after the failover. Option C is wrong because the events do not indicate a maintenance window. Option D is wrong because there is no evidence of insufficient storage.
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.
✗
A maintenance window update was applied, causing the instance to become unavailable.
Why it's wrong here
No maintenance event is shown.
✗
The DB instance ran out of storage and became read-only.
Why it's wrong here
No storage-related event is shown.
✓
A Multi-AZ failover occurred at 14:25 UTC, causing a brief outage.
Why this is correct
Failover involves promoting the standby, which causes a momentary outage.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The DB instance restarted at 14:30 UTC due to a manual reboot.
Why it's wrong here
The restart happened after the failover, likely due to the failover itself.
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.
Trap categories for this question
Command / output trap
No maintenance event is shown.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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.
Monitoring and Troubleshooting — This question tests Monitoring and Troubleshooting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A Multi-AZ failover occurred at 14:25 UTC, causing a brief outage. — Option A is correct because a Multi-AZ failover can cause a brief outage during the transition. The restart at 14:30 is likely the result of the failover. Option B is wrong because the restart occurred after the failover. Option C is wrong because the events do not indicate a maintenance window. Option D is wrong because there is no evidence of insufficient storage.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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