Question 1,369 of 1,711
DEA-C01 Data Store Management Practice Question
A data engineer needs to store semi-structured JSON data from IoT devices. The data is written frequently and read occasionally. Which AWS service is MOST cost-effective for this use case?
⚠ Common exam trap
Many exam-takers choose Amazon ElastiCache for Redis due to its speed and JSON module support, but they overlook that it is not designed for durable, cost-effective long-term storage of semi-structured data, and DynamoDB's native JSON support and pay-per-request pricing make it the more economical choice for this specific write-frequent, read-occasional pattern.
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 cost-effective choice because it is a fully managed NoSQL key-value and document database that natively supports semi-structured JSON data, offers single-digit millisecond latency for frequent writes, and provides a pay-per-request pricing model ideal for workloads with occasional reads. Its on-demand capacity mode automatically scales to handle high write throughput without provisioning, making it cheaper than provisioned alternatives for spiky or unpredictable IoT ingestion patterns.
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 in-memory and expensive for persistent storage.
- ✓
Amazon DynamoDB
Why this is correct
DynamoDB handles high write volumes efficiently.
- ✗
Amazon RDS for MySQL
Why it's wrong here
RDS is relational and may not be cost-effective for semi-structured data.
- ✗
Amazon Redshift
Why it's wrong here
Redshift is for analytics, not real-time writes.
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 →
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.