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Quick Answer
The correct answer is to enable DynamoDB Accelerator (DAX) with Write-Through caching. DAX is a fully managed, in-memory cache that reduces DynamoDB read response times from single-digit milliseconds to microseconds, while Write-Through caching ensures that every write to the table is also written to the DAX cache, so subsequent reads of the same item are served from memory with ultra-low latency. On the AWS Certified Data Engineer Associate DEA-C01 exam, this question tests your understanding of how to meet strict latency requirements by combining DAX for reads with Write-Through caching to keep the cache consistent for writes—a common trap is to assume DAX alone handles writes, but it only accelerates reads unless Write-Through is configured. Remember the memory tip: “DAX for reads, Write-Through for speed,” meaning DAX caches read results, and Write-Through ensures every write updates that cache instantly.
DEA-C01 Data Store Management Practice Question
This DEA-C01 practice question tests your understanding of data store management. 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 is evaluating Amazon DynamoDB for a new application. The application requires single-digit millisecond latency for read and write operations. Which TWO DynamoDB features should the company enable to achieve this? (Choose TWO.)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use DAX with Write-Through caching.
Option A is correct because DAX with Write-Through caching ensures that every write to DynamoDB is also written to the DAX cache, so subsequent reads of the same item are served from the in-memory cache with single-digit millisecond latency. Option D is correct because DynamoDB Accelerator (DAX) is a fully managed, highly available, in-memory cache that reduces read response times from single-digit milliseconds to microseconds, directly meeting the latency requirement for read operations.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse DynamoDB Accelerator (DAX) with DynamoDB Global Tables, assuming that multi-region replication improves local latency, when in fact DAX is the only feature that provides an in-memory cache for single-digit millisecond reads within a region.
Detailed technical explanation
How to think about this question
DAX uses an in-memory cache with a write-through policy, meaning that when an item is written to DynamoDB, it is synchronously written to the cache, ensuring cache coherence for subsequent reads. Under the hood, DAX maintains a distributed cache across multiple nodes, using a consistent hashing algorithm to distribute keys, and it supports both eventually consistent and strongly consistent reads, with read latency typically under 100 microseconds for cached items. In a real-world scenario, a gaming leaderboard application that frequently reads the same top scores would benefit from DAX, as it avoids repeated DynamoDB table scans and reduces read costs.
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
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FAQ
Questions learners often ask
What does this DEA-C01 question test?
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: Use DAX with Write-Through caching. — Option A is correct because DAX with Write-Through caching ensures that every write to DynamoDB is also written to the DAX cache, so subsequent reads of the same item are served from the in-memory cache with single-digit millisecond latency. Option D is correct because DynamoDB Accelerator (DAX) is a fully managed, highly available, in-memory cache that reduces read response times from single-digit milliseconds to microseconds, directly meeting the latency requirement for read operations.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 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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