SAA-C03 Design Cost-Optimized Architectures Practice Question

A risk simulation workload generates analytics files that are accessed unpredictably. Some files become hot again months later. The team wants automatic storage cost optimisation without retrieval delays. What should be used?

⚠ Common exam trap

Candidates often choose S3 Glacier Flexible Retrieval for cost savings, overlooking the 'without retrieval delays' requirement, which disqualifies any cold storage option that requires restoration time.

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

✓

S3 Intelligent-Tiering

S3 Intelligent-Tiering is the correct choice because it automatically moves objects between access tiers (frequent, infrequent, and archive instant access) based on changing access patterns, without any retrieval delays. This handles the unpredictable access described—files that become hot again months later—by keeping them in the archive instant access tier until access resumes, then promoting them instantly. It optimizes storage costs automatically without manual intervention or cold retrieval waits.

Answer analysis

Option-by-option breakdown

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

✗
Manual monthly review and object copying
Why it's wrong here
Performing monthly manual reviews and object copying introduces significant operational overhead and human error risk. This approach cannot adapt to real-time access patterns, and each manual copy incurs data transfer costs and potential versioning issues, making it an inefficient, labor-intensive strategy for managing changing analytical data.
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S3 Glacier Flexible Retrieval for all files
Why it's wrong here
S3 Glacier Flexible Retrieval is designed for archival data with retrieval times ranging from minutes to hours, so it cannot serve analytics files that require immediate, low-latency access. Additionally, every retrieval incurs restore costs and requires a separate restore step before the object is readable, adding complexity and delay that is unacceptable for frequent or on-demand analysis.
✓
S3 Intelligent-Tiering
Why this is correct
S3 Intelligent-Tiering automatically monitors and moves objects between four access tiers—frequent, infrequent, archive instant, and archive access—based on changing usage patterns, with zero retrieval fees and no latency impact. It allows the risk simulation workload to pay only for the storage class each file actually needs, while keeping every object immediately available for analysis.
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EFS One Zone for analytics files
Why it's wrong here
EFS One Zone provides a POSIX file system in a single Availability Zone, which is not designed for S3-based analytics object workflows and lacks the automatic tiering capabilities needed for cost optimization. It also introduces single-AZ availability risk and requires managing file systems and EC2 mounts, rather than leveraging S3's managed object storage APIs.

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

SAA-C03 Design Cost-Optimized Architectures Practice Question

Why each option matters

Option-by-option breakdown

AWS S3 Storage Class Comparison

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