SAA-C03 Design Cost-Optimized Architectures Practice Question
A media processing workflow 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
A common mix-up: candidates choose S3 Glacier Flexible Retrieval (Option C) thinking it is the cheapest archival option, but they overlook the requirement for 'no retrieval delays' and the unpredictable access pattern that makes Intelligent-Tiering's automatic tiering the correct choice.
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 automatically moves objects between access tiers (frequent, infrequent, and archive instant access) based on changing access patterns, with no retrieval delays for hot objects. This is ideal for unpredictable access where some files become hot again months later, as it optimizes storage costs without manual intervention or retrieval latency.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
S3 Intelligent-Tiering
Why this is correct
S3 Intelligent-Tiering automatically tracks object access and moves data between frequent and infrequent access tiers, with optional archive tiers, while charging no retrieval fees. It preserves S3 Standard latency and throughput, so analytics files remain immediately available when accessed. Because the tiering is entirely automated and backed by an SLA, it removes the need for human intervention or lifecycle guessing.
- ✗
Manual monthly review and object copying
Why it's wrong here
A monthly manual review cannot react to access patterns that change within days or hours, and it requires someone to predict which files will be needed next. Each copy operation to another storage class incurs request and data transfer costs, and a misplaced classification could put active analytics files into a slow, expensive-to-retrieve tier. This approach adds operational overhead and fragility instead of using S3's built-in lifecycle or intelligent-tiering automation.
- ✗
S3 Glacier Flexible Retrieval for all files
Why it's wrong here
S3 Glacier Flexible Retrieval is designed for archival data with retrieval times of minutes to hours, not for analytics files that may be requested immediately after generation. If all files are in Glacier, every read needs a restore job, adding complexity and per-retrieval fees that make frequent access economically inefficient. A media analytics pipeline typically needs low-latency access to recent outputs, so a single cold tier for every file is mismatched with the workload.
- ✗
EFS One Zone for analytics files
Why it's wrong here
EFS One Zone is a POSIX file system mounted to EC2 instances, not an object-storage class with S3 API compatibility, so it would require rewriting the analytics workflow to use file APIs. It stores data in only one Availability Zone, giving no protection against AZ loss, and it does not offer the per-object automatic tiering or lifecycle transitions that S3 Storage Classes provide. Using EFS for what are essentially S3 objects adds architectural complexity and reduces durability.
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
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