DEA-C01 Data Store Management Practice Question
A company wants to store historical financial data for 7 years with immediate access for the first year and then infrequent access. After 7 years, the data must be automatically deleted. Which S3 lifecycle policy should be configured?
⚠ Common exam trap
The trap is that candidates may think Option B is correct because it transitions to Glacier Flexible Retrieval after 365 days and expires after 2555 days, but this option provides immediate access for only the first year? Actually, Standard-IA (Option A) and One Zone-IA (Option C) are not suitable for long-term archival. Option D is correct because Glacier Deep Archive offers the lowest cost for infrequent access after year one, with deletion after 7 years. The key mistake is choosing a storage class that is too expensive or not durable enough for the full 7-year retention.
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 to S3 Glacier Deep Archive after 365 days, expire after 2555 days
It meets all requirements: immediate access for the first year (no transition before 365 days), then transition to S3 Glacier Deep Archive for infrequent access and cost savings, with automatic deletion after 7 years (2555 days). S3 Glacier Deep Archive is the most cost-effective storage class for long-term archival data that is rarely accessed, and the 2555-day expiration ensures compliance with the 7-year retention policy.
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 to S3 Standard-IA after 30 days, expire after 2555 days
Why it's wrong here
Standard-IA is for infrequent access but not optimal for 7 years.
- ✗
Transition to S3 Glacier Flexible Retrieval after 365 days, expire after 2555 days
Why it's wrong here
Glacier Flexible is more expensive than Deep Archive for long-term archival.
- ✗
Transition to S3 One Zone-IA after 90 days, expire after 365 days
Why it's wrong here
Expires after 1 year, not 7 years.
- ✓
Transition to S3 Glacier Deep Archive after 365 days, expire after 2555 days
Why this is correct
This is cost-effective: immediate access for 1 year, then low-cost storage, delete after 7 years.
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 |
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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