Quick Answer
The answer is a hot partition caused by a poorly designed partition key. This is the most likely cause because DynamoDB throttling occurs at the partition level, not the table level; when a single partition key receives a disproportionate volume of write requests, it exhausts that partition’s allocated capacity, even if auto scaling has increased the table’s total throughput. Auto scaling adjusts the overall read/write capacity units across all partitions, but it cannot rebalance uneven traffic distribution among individual partitions. On the AWS Certified Data Engineer Associate DEA-C01 exam, this concept tests your understanding that throttling exceptions often stem from data access patterns rather than insufficient total capacity—a common trap is assuming auto scaling alone solves all throughput issues. A key memory tip: think of a “hot key” as a single overloaded checkout lane in a grocery store; adding more cashiers (auto scaling) doesn’t help if every customer still queues at the same lane.
This DEA-C01 practice question tests your understanding of data store management. 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 data engineer is troubleshooting an Amazon DynamoDB table that has frequent throttling exceptions for write requests. The table has auto scaling enabled. What is the most likely cause?
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.
The partition key is causing a hot partition
Hot partitions throttle even if overall capacity is sufficient.
The table's read capacity is set too low
Why wrong: Throttling is for write requests, not read.
The table's auto scaling is disabled
Why wrong: Auto scaling is enabled as per stem.
The table is using global tables without conflict resolution
Why wrong: Global tables replicate writes but don't cause throttling.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The partition key is causing a hot partition
Hot partition is a common cause where a single partition key receives a disproportionate amount of writes, exhausting that partition's capacity. Auto scaling adjusts total capacity, not partition-level distribution.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
The partition key is causing a hot partition
Why this is correct
Hot partitions throttle even if overall capacity is sufficient.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
The table's read capacity is set too low
Why it's wrong here
Throttling is for write requests, not read.
The table's auto scaling is disabled
Why it's wrong here
Auto scaling is enabled as per stem.
The table is using global tables without conflict resolution
Why it's wrong here
Global tables replicate writes but don't cause throttling.
Common exam traps
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
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. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. 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
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DEA-C01 NAT questions on configuration and troubleshooting.
Data Store Management — study guide chapter
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FAQ
Data Store Management — This question tests Data Store Management — Static NAT maps one inside address to one outside address..
The correct answer is: The partition key is causing a hot partition — Hot partition is a common cause where a single partition key receives a disproportionate amount of writes, exhausting that partition's capacity. Auto scaling adjusts total capacity, not partition-level distribution.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DEA-C01 NAT questions on configuration and troubleshooting.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 20, 2026
This DEA-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DEA-C01 exam.
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