The correct answer is to review Amazon CloudWatch metrics for 'WriteThrottleEvents' and 'ConsumedWriteCapacityUnits' to identify the specific partition keys causing the bottleneck. This is essential because DynamoDB write throttling, even on on-demand capacity, occurs when a single partition key receives too many writes, creating a "hot partition" that exceeds the per-partition throughput limit of 1,000 write capacity units. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding that on-demand mode only protects against overall table throttling, not uneven key distribution—a common trap where candidates assume on-demand eliminates all throttling. To resolve it, you must analyze the CloudWatch metrics to spot the skewed access pattern, then apply write sharding or redesign the partition key to distribute traffic evenly. Memory tip: "Hot keys, not hot tables" — throttling in on-demand is always a key distribution problem, not a capacity problem.
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 database specialist is troubleshooting an Amazon DynamoDB table that is experiencing high throttling on write requests. The table has on-demand capacity and uses a composite primary key (partition key and sort key). Which THREE actions should the specialist take to identify and resolve the issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Examine the partition key value distribution to identify hot partitions
Option A is correct because high throttling on write requests in DynamoDB often results from uneven partition key value distribution, creating 'hot partitions' that exceed the per-partition throughput limits. By examining the distribution, the specialist can identify which keys are causing the bottleneck and then apply strategies like write sharding or adjusting the partition key design to spread traffic evenly.
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.
✓
Examine the partition key value distribution to identify hot partitions
Why this is correct
Uneven distribution causes throttling on hot partitions.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✓
Implement DynamoDB Accelerator (DAX) to offload read traffic
Why this is correct
DAX reduces read load, freeing write capacity.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Change the table to provisioned capacity mode
Why it's wrong here
Provisioned capacity may still have hot partition issues.
✗
Increase the read capacity units on the table
Why it's wrong here
Read capacity does not affect write throttling.
✓
Review Amazon CloudWatch metrics for 'WriteThrottleEvents' and 'ConsumedWriteCapacityUnits'
Why this is correct
These metrics pinpoint throttling and capacity usage.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse read and write capacity units or assume that on-demand capacity eliminates all throttling, when in fact hot partitions can still cause throttling regardless of the capacity mode.
Detailed technical explanation
How to think about this question
DynamoDB on-demand capacity mode automatically scales to handle traffic spikes, but it still enforces per-partition throughput limits (up to 3,000 read capacity units or 1,000 write capacity units per partition). When a single partition key receives excessive writes, it can throttle even if overall table usage is within limits. CloudWatch metrics like 'WriteThrottleEvents' and 'ConsumedWriteCapacityUnits' (Option E) help pinpoint the exact partitions and timeframes where throttling occurs, enabling targeted remediation such as adaptive capacity or partition key redesign.
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.
TExam Day Tips
→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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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: Examine the partition key value distribution to identify hot partitions — Option A is correct because high throttling on write requests in DynamoDB often results from uneven partition key value distribution, creating 'hot partitions' that exceed the per-partition throughput limits. By examining the distribution, the specialist can identify which keys are causing the bottleneck and then apply strategies like write sharding or adjusting the partition key design to spread traffic evenly.
What should I do if I get this DBS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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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