DEA-C01 Data Store Management Practice Question

Which TWO options are valid ways to reduce storage costs for an Amazon S3 data lake that stores historical data rarely accessed after 30 days? (Choose TWO.)

⚠ Common exam trap

Watch out — candidates often confuse data protection features (like Versioning) with cost optimization, or they assume that deleting data is the only way to reduce costs, overlooking lifecycle transitions to lower-cost storage classes that retain data accessibility.

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

✓

Create a lifecycle policy to transition objects to S3 Standard-IA after 30 days.

S3 Standard-IA (Infrequent Access) is designed for data accessed less frequently but requires rapid access when needed. Transitioning objects to Standard-IA after 30 days reduces storage costs compared to S3 Standard while maintaining low-latency retrieval, making it ideal for a data lake where historical data is rarely accessed after the first month.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
Enable S3 Transfer Acceleration for all uploads.
Why it's wrong here
Transfer Acceleration incurs additional costs.
✓
Create a lifecycle policy to transition objects to S3 Standard-IA after 30 days.
Why this is correct
Standard-IA reduces storage cost for infrequent access.
✗
Create a lifecycle policy to delete objects after 30 days.
Why it's wrong here
Deleting data may not be desired for historical data.
✓
Create a lifecycle policy to transition objects to S3 Glacier Deep Archive after 90 days.
Why this is correct
Deep Archive is the lowest-cost storage for archival.
✗
Enable S3 Versioning to preserve all object versions.
Why it's wrong here
Versioning increases storage costs.

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

DEA-C01 Data Store Management Practice Question

Why each option matters

Option-by-option breakdown

AWS S3 Storage Class Comparison

Related to this question