DEA-C01 Data Store Management Practice Question
A company is designing a data lake on Amazon S3. The data engineering team needs to implement a lifecycle policy to manage costs. Which TWO actions should be taken to reduce storage costs?
⚠ Common exam trap
It's easy for candidates to choose S3 Intelligent-Tiering or S3 Standard-IA as cost-saving measures without considering that the question specifically asks for lifecycle policy actions to reduce costs, and that Glacier Deep Archive and deleting incomplete multipart uploads are the most direct and effective actions for a data lake scenario.
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
✓
Transition objects to S3 Glacier Deep Archive after 90 days.
Transitioning objects to S3 Glacier Deep Archive after 90 days significantly reduces storage costs for data that is rarely accessed and can tolerate a retrieval time of 12 hours. This lifecycle policy is a standard cost-optimization strategy for data lakes where historical or cold data does not require immediate access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Transition objects to S3 Glacier Deep Archive after 90 days.
Why this is correct
Deep Archive is lowest cost for rarely accessed data.
- ✗
Transition objects to S3 One Zone-IA after 30 days.
Why it's wrong here
One Zone-IA is less durable and may not be appropriate.
- ✗
Enable S3 Intelligent-Tiering.
Why it's wrong here
Intelligent-Tiering has monitoring costs and may not be optimal.
- ✗
Transition objects to S3 Standard-IA after 30 days.
Why it's wrong here
May not be cost-effective if data is accessed frequently.
- ✓
Delete incomplete multipart uploads after 7 days.
Why this is correct
Prevents storage of incomplete upload parts.
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 |
Go deeper
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JA
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.