- A
Amazon Redshift
Why wrong: Redshift is for analytics.
- B
Amazon DynamoDB
DynamoDB is a NoSQL key-value and document database with low latency.
- C
Amazon Neptune
Why wrong: Neptune is a graph database.
- D
Amazon RDS for MySQL
Why wrong: RDS is relational, not optimized for JSON key-value.
Question 249 of 1,786
Choose DynamoDB for JSON Key-Value Workloads Requiring Low Latency
This DEA-C01 practice question tests your understanding of data store management. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 needs to store JSON documents that are accessed by a key-value pattern. The data is 500 GB and requires single-digit millisecond latency. Which AWS database is most suitable?
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
✓
Amazon DynamoDB
Amazon DynamoDB is the most suitable choice because it is a fully managed NoSQL key-value and document database that delivers single-digit millisecond latency at any scale, making it ideal for storing and retrieving JSON documents via a key-value access pattern. It supports document data types natively and can handle 500 GB of data efficiently with consistent low-latency performance.
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.
- ✗
Amazon Redshift
Why it's wrong here
Redshift is for analytics.
- ✓
Amazon DynamoDB
Why this is correct
DynamoDB is a NoSQL key-value and document database with low latency.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon Neptune
Why it's wrong here
Neptune is a graph database.
- ✗
Amazon RDS for MySQL
Why it's wrong here
RDS is relational, not optimized for JSON key-value.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may choose Amazon RDS for MySQL because they associate JSON documents with relational databases, overlooking that DynamoDB is purpose-built for key-value and document workloads with guaranteed single-digit millisecond latency, while RDS introduces schema rigidity and higher latency for this pattern.
Detailed technical explanation
How to think about this question
DynamoDB achieves single-digit millisecond latency through its distributed architecture, where data is automatically partitioned across multiple nodes using the primary key, and it uses solid-state drives (SSDs) for storage. It supports JSON natively via the document data model, allowing direct access to nested attributes without schema changes, and its on-demand capacity mode can handle unpredictable workloads. In a real-world scenario, a gaming leaderboard storing player profiles as JSON documents would benefit from DynamoDB's ability to scale horizontally and maintain consistent performance under load.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
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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: Amazon DynamoDB — Amazon DynamoDB is the most suitable choice because it is a fully managed NoSQL key-value and document database that delivers single-digit millisecond latency at any scale, making it ideal for storing and retrieving JSON documents via a key-value access pattern. It supports document data types natively and can handle 500 GB of data efficiently with consistent low-latency performance.
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.
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 →
Same concept, more angles
2 more ways this is tested on DEA-C01
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 engineer needs to store JSON documents that are accessed by a serverless application using AWS Lambda. The documents are frequently updated and need low latency (single-digit milliseconds) for read and write operations. Which AWS service should the engineer use?
easy- ✓ A.Amazon DynamoDB
- B.Amazon ElastiCache for Redis
- C.Amazon S3 (with S3 Select)
- D.Amazon RDS for MySQL
Why A: Amazon DynamoDB is a fully managed NoSQL key-value and document database that provides single-digit millisecond latency for read and write operations at any scale. It natively supports JSON documents, integrates directly with AWS Lambda via the AWS SDK, and handles frequent updates efficiently through its auto-scaling and on-demand capacity modes, making it ideal for serverless applications requiring low-latency data access.
Variation 2. A data engineer needs to store JSON documents that are accessed by a key-value pattern. The workload requires single-digit millisecond latency at any scale. Which AWS service is most appropriate?
medium- A.Amazon DocumentDB (with MongoDB compatibility)
- B.Amazon RDS for PostgreSQL
- ✓ C.Amazon DynamoDB
- D.Amazon Neptune
Why C: Amazon DynamoDB is a fully managed NoSQL key-value and document database that delivers single-digit millisecond latency at any scale. It is optimized for key-value access patterns, making it the ideal choice for storing and retrieving JSON documents by a primary key with consistent low latency.
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Last reviewed: Jul 4, 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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