Question 915 of 1,711
DEA-C01 Data Store Management Practice Question
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?
⚠ Common exam trap
A common mix-up: candidates confuse DocumentDB's document storage capability with DynamoDB's key-value performance, overlooking that DocumentDB is not designed for single-digit millisecond latency at any scale, especially under high throughput.
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 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.
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 DocumentDB (with MongoDB compatibility)
Why it's wrong here
MongoDB compatible but not as fast for key-value patterns.
- ✗
Amazon RDS for PostgreSQL
Why it's wrong here
Relational, not key-value optimized.
- ✓
Amazon DynamoDB
Why this is correct
Key-value and document store with consistent low latency.
- ✗
Amazon Neptune
Why it's wrong here
Graph database, not key-value.
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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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