DEA-C01 Data Store Management Practice Question
A data engineer is designing a data store for a real-time analytics application that requires sub-millisecond read and write latency. The data is key-value in nature and the workload is both read-heavy and write-heavy. Which AWS service is most suitable?
⚠ Common exam trap
Test-takers frequently choose ElastiCache for Redis because of its sub-millisecond performance, overlooking that the question specifies a 'data store' for a write-heavy workload, which requires durability and persistence that Redis does not guarantee by default, whereas DynamoDB is a fully managed, durable database designed for such use cases.
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 service because it is a fully managed NoSQL key-value and document database designed for single-digit millisecond latency at any scale, and with features like DynamoDB Accelerator (DAX) it can achieve sub-millisecond read latency. It supports both read-heavy and write-heavy workloads through its distributed architecture and auto-scaling capabilities, making it ideal for real-time analytics applications.
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 ElastiCache for Redis
Why it's wrong here
ElastiCache is a cache, not a durable data store; data loss can occur.
- ✓
Amazon DynamoDB
Why this is correct
DynamoDB offers consistent single-digit millisecond latency at scale.
- ✗
Amazon RDS for MySQL
Why it's wrong here
RDS latency is higher, especially under heavy write loads.
- ✗
Amazon S3
Why it's wrong here
S3 latency is in the hundreds of milliseconds, not sub-millisecond.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.