The correct answer is to switch to a larger or non-burstable instance because the db.t3.medium has exhausted its CPU credits and is now burning surplus credits, which triggers throttling and the unresponsiveness seen in the CloudWatch metrics. T3 instances operate on a burstable performance model, earning CPU credits during idle periods and spending them during activity; when the credit balance hits zero, the instance can dip into surplus credits (tracked by CPUSurplusCreditsCharged) but at a cost, and once those are depleted, CPU performance is strictly limited, causing brief freezes under load. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of burstable instance behavior and the difference between standard and unlimited mode—a common trap is confusing storage or networking issues with CPU credit exhaustion. The fix is either enabling T3 unlimited mode (which allows sustained surplus usage but incurs per-vCPU-hour charges) or migrating to a non-burstable instance like m5.large for consistent baseline performance. Memory tip: if you see CPUSurplusCreditsCharged, think "surplus means spending, not saving"—the instance is out of earned credits and needs a bigger engine.
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.
A company runs a critical application on Amazon RDS for PostgreSQL. The application team reports that the database occasionally becomes unresponsive for a few seconds. CloudWatch metrics show 'CPUSurplusCreditsCharged' and 'CPUSurplusCredits' are not 0. The instance is a db.t3.medium. What is the likely cause and how should it be fixed?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The instance is out of CPU credits and is being throttled; switch to a larger or non-burstable instance
Option A is correct because t3 instances are burstable and use CPU credits. When credits are exhausted, they can use surplus credits, which incur charges. If the workload is consistently high, the instance may run out of credits and become throttled, causing unresponsiveness. The fix is to switch to a T3 unlimited mode (but that incurs charges) or use a non-burstable instance (e.g., m5). Option B is wrong because modifying Multi-AZ does not affect CPU credits. Option C is wrong because enabling Enhanced Monitoring does not fix credit exhaustion. Option D is wrong because storage optimization does not affect CPU credits.
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.
✓
The instance is out of CPU credits and is being throttled; switch to a larger or non-burstable instance
Why this is correct
Burstable instances rely on CPU credits; when exhausted, performance is limited, causing unresponsiveness.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable Enhanced Monitoring to diagnose the issue
Why it's wrong here
Enhanced Monitoring provides granular metrics but does not fix the root cause.
✗
Increase the allocated storage to improve I/O
Why it's wrong here
I/O is not related to CPU credit exhaustion.
✗
The instance is experiencing a failover; enable Multi-AZ
Why it's wrong here
Failover would be visible in other metrics and not related to CPU credits.
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 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: The instance is out of CPU credits and is being throttled; switch to a larger or non-burstable instance — Option A is correct because t3 instances are burstable and use CPU credits. When credits are exhausted, they can use surplus credits, which incur charges. If the workload is consistently high, the instance may run out of credits and become throttled, causing unresponsiveness. The fix is to switch to a T3 unlimited mode (but that incurs charges) or use a non-burstable instance (e.g., m5). Option B is wrong because modifying Multi-AZ does not affect CPU credits. Option C is wrong because enabling Enhanced Monitoring does not fix credit exhaustion. Option D is wrong because storage optimization does not affect CPU credits.
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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