DEA-C01 Data Store Management Practice Question
A data engineer needs to store a large number of small files (each a few KB) from IoT sensors. The data is written once and never modified. The primary requirement is high write throughput and low latency for writes. Which storage solution is most suitable?
⚠ Common exam trap
It's easy for candidates to choose Amazon S3 for storing small files because of its durability and cost, but they overlook the fact that S3's PUT request latency and eventual consistency model make it unsuitable for high-frequency, low-latency write workloads, whereas DynamoDB is purpose-built for such patterns.
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 with on-demand capacity
Amazon DynamoDB with on-demand capacity is the most suitable because it is a NoSQL key-value and document database designed for single-digit millisecond latency at any scale. It supports high write throughput by automatically distributing data across multiple partitions, and on-demand capacity eliminates the need for provisioning, allowing it to absorb unpredictable write spikes from many IoT sensors without throttling.
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 DynamoDB with on-demand capacity
Why this is correct
DynamoDB provides single-digit millisecond latency and high throughput for writes.
- ✗
Amazon RDS for MySQL with InnoDB
Why it's wrong here
RDS is relational and not optimized for high-volume small writes; may require scaling.
- ✗
Amazon S3 with standard storage class
Why it's wrong here
S3 is not designed for high-frequency small writes; can lead to high costs and latency.
- ✗
Amazon Elastic Block Store (EBS) volumes
Why it's wrong here
EBS is block storage for EC2, not a managed data store for IoT ingestion.
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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.