The correct answer is to implement write sharding by using a composite partition key, add a suffix to the partition key, and use DynamoDB Accelerator (DAX) to reduce read load. This combination directly addresses the core issue of uneven partition distribution by artificially distributing writes across multiple physical partitions through a randomized or calculated suffix appended to the user_id, while DAX offloads read traffic to free up write capacity on the hot partitions. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of DynamoDB’s internal partition splitting logic and the distinction between capacity scaling and data distribution—a common trap is confusing increased read capacity or switching to on-demand mode with fixing partition skew, but neither improves the actual distribution of writes. Remember the mnemonic “Suffix Spreads, DAX Deflects” to recall that partition key modification spreads writes, and caching reduces read pressure on the same partitions.
SAP-C02 Continuous Improvement for Existing Solutions Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. 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 uses Amazon DynamoDB for a gaming application. The table has a partition key of user_id and a sort key of timestamp. During a new game launch, the table experiences throttling on a few partitions. The company wants to improve the partition distribution. Which THREE actions should the company take? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add a random suffix to the partition key to distribute writes more evenly.
Option A is correct because adding a suffix to partition key can spread writes across partitions. Option C is correct because using DynamoDB Accelerator (DAX) reduces read load, indirectly helping write capacity. Option D is correct because using write sharding distributes writes across multiple partitions. Option B is wrong because increasing read capacity does not help write throttling. Option E is wrong because changing to on-demand may help but does not improve partition distribution.
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.
✓
Add a random suffix to the partition key to distribute writes more evenly.
Why this is correct
Random suffixes spread writes across partitions.
Related concept
Read the scenario before looking for a memorised answer.
✓
Use DAX (DynamoDB Accelerator) to cache read-heavy workloads.
Why this is correct
DAX reduces read load, freeing up capacity for writes.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increase the read capacity units for the table.
Why it's wrong here
Read capacity does not affect write throttling.
✓
Implement write sharding by using a composite partition key.
Why this is correct
Write sharding distributes write traffic across partitions.
Related concept
Read the scenario before looking for a memorised answer.
✗
Switch the table to on-demand capacity mode.
Why it's wrong here
On-demand handles spikes but does not improve partition distribution.
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 SAP-C02 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.
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Add a random suffix to the partition key to distribute writes more evenly. — Option A is correct because adding a suffix to partition key can spread writes across partitions. Option C is correct because using DynamoDB Accelerator (DAX) reduces read load, indirectly helping write capacity. Option D is correct because using write sharding distributes writes across multiple partitions. Option B is wrong because increasing read capacity does not help write throttling. Option E is wrong because changing to on-demand may help but does not improve partition distribution.
What should I do if I get this SAP-C02 question wrong?
Identify which SAP-C02 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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