The answer is that the provisioned write capacity is too low for the application’s write rate. DynamoDB throttles write requests when the actual traffic exceeds the table’s provisioned throughput, measured in write capacity units (WCUs), where each WCU supports one write per second of up to 1 KB. With only 5 WCUs configured, the table can handle just 5 writes per second, but the application is sending 200 items per second, causing severe throttling. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding of DynamoDB provisioned throughput and throttling mechanics, often appearing as a trap where candidates overlook the WCU-to-write ratio or confuse throttling with key schema issues. A common memory tip is to remember that each WCU equals one 1 KB write per second, so always calculate total WCUs needed by dividing your item size into 1 KB and multiplying by your target writes per second. Think of it as “1 WCU = 1 write per second” to avoid under-provisioning.
DEA-C01 Data Operations and Support Practice Question
This DEA-C01 practice question tests your understanding of data operations and support. 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 data engineer creates an Amazon DynamoDB table using the CloudFormation snippet in the exhibit. The application writes 200 items per second to the table. The engineer notices that many write requests are being throttled. What is the MOST likely reason?
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 provisioned write capacity is too low for the application's write rate.
Option D is correct because the table is provisioned with only 5 write capacity units, which allows 5 writes per second (each write up to 1 KB). With 200 writes per second, the table is severely under-provisioned. Option A is incorrect because the key schema is fine for a primary key. Option B is incorrect because the attribute type is correct. Option C is incorrect because the table name is valid.
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 does not have a sort key, causing hot partitions.
Why it's wrong here
A sort key is optional; hot partitions would cause throttling but the main issue is insufficient throughput.
✗
The attribute type for OrderID should be numeric for better performance.
Why it's wrong here
String type is fine for a hash key.
✗
The table name 'Orders' conflicts with an existing table.
Why it's wrong here
CloudFormation would fail if table already exists.
✓
The provisioned write capacity is too low for the application's write rate.
Why this is correct
5 WCU allows only 5 writes per second (1 KB each).
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.
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 DEA-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.
Data Operations and Support — This question tests Data Operations and Support — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The provisioned write capacity is too low for the application's write rate. — Option D is correct because the table is provisioned with only 5 write capacity units, which allows 5 writes per second (each write up to 1 KB). With 200 writes per second, the table is severely under-provisioned. Option A is incorrect because the key schema is fine for a primary key. Option B is incorrect because the attribute type is correct. Option C is incorrect because the table name is valid.
What should I do if I get this DEA-C01 question wrong?
Identify which DEA-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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