Question 343 of 1,711
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 for time-series data. The data volume is expected to grow to hundreds of terabytes. Which TWO AWS services should the engineer consider? (Choose TWO.)
⚠ Common exam trap
The trap here is that candidates may overlook Amazon Timestream because it is a newer, specialized service, and instead choose ElastiCache for Redis due to its low latency, failing to consider the hundreds of terabytes storage requirement that makes Redis impractical.
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 Time-to-Live (TTL)
Amazon DynamoDB with TTL is correct because it provides single-digit millisecond read and write latency at any scale, making it suitable for real-time time-series data. The TTL feature automatically expires old records, which helps manage the hundreds of terabytes of data without manual intervention, keeping storage costs predictable.
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 analytical queries, not sub-millisecond latency.
- ✓
Amazon DynamoDB with Time-to-Live (TTL)
Why this is correct
DynamoDB supports low-latency reads/writes and TTL for automatic expiration of old data.
- ✗
Amazon ElastiCache for Redis
Why it's wrong here
ElastiCache is in-memory and limited by cluster memory size; hundreds of terabytes would be costly.
- ✗
Amazon RDS for PostgreSQL
Why it's wrong here
RDS is not optimized for time-series and may not achieve sub-millisecond latency at scale.
- ✓
Amazon Timestream
Why this is correct
Timestream is purpose-built for time-series data and provides low-latency queries.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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.