The answer is exceeding the table’s previous peak traffic by more than double, which is the most likely cause of DynamoDB write throttling on on-demand capacity. Unlike provisioned capacity, on-demand mode automatically scales to handle traffic, but it relies on a “doubling burst” mechanism: if your write traffic suddenly spikes to more than twice the highest volume the table has ever seen, DynamoDB cannot scale instantly and will throttle requests to protect the service. On the AWS Certified Database Specialty DBS-C01 exam, this concept tests your understanding that on-demand is not infinite—it has a memory of prior peaks, and a sharp, unanticipated surge is the primary throttling trigger. A common trap is assuming on-demand eliminates all throttling, but account-level limits or hot partitions can also cause issues, though the most likely scenario in this context is the peak-traffic doubling rule. Memory tip: “Double the peak, and you’re weak”—if your writes exceed twice the historical high, expect throttling.
DBS-C01 Monitoring and Troubleshooting Practice Question
This DBS-C01 practice question tests your understanding of monitoring and troubleshooting. 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 team is troubleshooting an Amazon DynamoDB table that is throttling write requests. The table has on-demand capacity mode enabled. Which of the following is the most likely cause of the throttling?
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
✓
The write traffic exceeds the table's previous peak traffic by more than double.
Even with on-demand capacity, DynamoDB can throttle if you exceed the account-level provisioned throughput limits or if there is a sudden spike that exceeds the previous peak traffic by a large margin. Option C is correct; Option A is incorrect because on-demand does not have per-table limits. Option B is incorrect because adaptive capacity helps but does not prevent all throttling. Option D is a possible reason but not the most likely.
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 table has exceeded its provisioned write capacity units.
Why it's wrong here
On-demand tables do not have provisioned capacity.
✓
The write traffic exceeds the table's previous peak traffic by more than double.
Why this is correct
DynamoDB on-demand can throttle if traffic exceeds the previous peak by more than double in a short time.
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 table is not using adaptive capacity.
Why it's wrong here
Adaptive capacity is automatically enabled for all DynamoDB tables.
✗
There is an active AWS Health event affecting the DynamoDB service.
Why it's wrong here
Service health events are rare and not the most likely cause.
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 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.
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 write traffic exceeds the table's previous peak traffic by more than double. — Even with on-demand capacity, DynamoDB can throttle if you exceed the account-level provisioned throughput limits or if there is a sudden spike that exceeds the previous peak traffic by a large margin. Option C is correct; Option A is incorrect because on-demand does not have per-table limits. Option B is incorrect because adaptive capacity helps but does not prevent all throttling. Option D is a possible reason but not the most likely.
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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