The answer is to enable DynamoDB Accelerator (DAX) for the table. DAX is a fully managed, in-memory caching service that delivers up to 10x DynamoDB read performance improvement by caching the results of frequently accessed items, which directly addresses the hot partition issue causing latency spikes. Because the application uses strongly consistent reads and cannot be modified, DAX provides a seamless, drop-in solution that requires no code changes—it simply sits between the application and the table, caching reads while still allowing writes to pass through. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding of when to use caching versus other read scaling options like read replicas or Global Tables; a common trap is choosing to increase read capacity units, which doesn’t solve the underlying hot partition problem. Remember the memory tip: DAX for hot partitions, no code modifications—just cache and go.
DEA-C01 Data Store Management Practice Question
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 engineering team is managing an Amazon DynamoDB table that stores user session data. The table has a primary key of user_id (partition key) and session_id (sort key). The application performs strongly consistent reads on individual items. The team notices that read latency increases during peak hours. They suspect that the table is experiencing hot partitions. The team needs to improve read performance without changing the application code. Which solution should they implement?
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
✓
Enable DynamoDB Accelerator (DAX) for the table.
DynamoDB Accelerator (DAX) is a fully managed, in-memory cache that delivers up to 10x read performance improvement by caching hot partition data. Since the application uses strongly consistent reads and cannot be changed, DAX provides a drop-in caching layer that reduces read latency on hot partitions without requiring any code modifications.
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.
✗
Enable DynamoDB global tables to distribute reads across regions.
Why it's wrong here
Global tables are for cross-region replication, not performance.
✓
Enable DynamoDB Accelerator (DAX) for the table.
Why this is correct
DAX caches reads and reduces latency.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increase the read capacity units for the table.
Why it's wrong here
May not solve hot partition issue if the partition key is skewed.
✗
Change the application to use eventually consistent reads.
Why it's wrong here
Application requires strongly consistent reads.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the misconception that increasing provisioned capacity (RCUs) can solve hot partition issues, but candidates must remember that DynamoDB enforces a per-partition throughput limit that cannot be exceeded regardless of total table capacity.
Detailed technical explanation
How to think about this question
DAX acts as a write-through cache that intercepts read requests at the VPC endpoint, serving strongly consistent reads from its in-memory cache if the data is present, and falling back to DynamoDB only on a cache miss. Under the hood, DAX maintains a distributed cache across multiple nodes, using a consistent hashing ring to distribute cached items, which directly alleviates pressure on hot partitions by reducing the number of reads hitting the underlying DynamoDB storage nodes. In real-world scenarios, a single user_id partition receiving thousands of reads per second can be fully served from DAX memory, bypassing the partition's throughput ceiling.
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.
Data Store Management — This question tests Data Store Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable DynamoDB Accelerator (DAX) for the table. — DynamoDB Accelerator (DAX) is a fully managed, in-memory cache that delivers up to 10x read performance improvement by caching hot partition data. Since the application uses strongly consistent reads and cannot be changed, DAX provides a drop-in caching layer that reduces read latency on hot partitions without requiring any code modifications.
What should I do if I get this DEA-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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A data engineering team is using Amazon DynamoDB to store user session data for a web application. The application experiences sudden spikes in traffic, causing throttling on the DynamoDB table. The team wants to minimize throttling without over-provisioning read/write capacity. Which solution should the team implement?
medium
A.Enable DynamoDB Time to Live (TTL) to automatically delete expired items.
B.Disable auto scaling and manually set a high provisioned capacity.
C.Use Amazon RDS read replicas to offload read traffic.
Why D: Option D is correct because DynamoDB Accelerator (DAX) provides a fully managed in-memory cache that reduces read load on the table, thus minimizing throttling for read-heavy workloads. Option A is incorrect because disabling auto scaling would worsen throttling. Option B is incorrect because read replicas are for RDS, not DynamoDB. Option C is incorrect because adding a TTL does not reduce throttling; it only expires old data.
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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.
Question Discussion
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