SOA-C02 Cost and Performance Optimization Practice Question
A company stores video files in Amazon S3. The files are accessed frequently for the first week, then weekly for the next month, and then rarely after that. The files must be retained for 5 years and any access must be served within minutes. The SysOps administrator needs to minimize storage costs while meeting these requirements. Which lifecycle policy configuration is the most cost-effective?
⚠ Common exam trap
It's easy for candidates to confuse S3 Glacier Flexible Retrieval or S3 Glacier Deep Archive as cost-effective options without verifying the retrieval time requirement, assuming 'Glacier' always means cheap but slow, while the question explicitly requires access 'within minutes'.
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 Standard-IA after 7 days, then to S3 Glacier Instant Retrieval after 30 days.
It transitions to S3 Standard-IA after 7 days (matching the frequent first-week access), then to S3 Glacier Instant Retrieval after 30 days (matching the weekly access for the next month). Glacier Instant Retrieval provides millisecond retrieval for rarely accessed data, meeting the 'within minutes' requirement while minimizing costs compared to Standard-IA or Intelligent-Tiering.
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 7 days, then to S3 Glacier Flexible Retrieval after 30 days.
Why it's wrong here
Glacier Flexible Retrieval has retrieval times of 1-5 minutes typically (expedited) or 3-5 hours (standard). Though expedited can be minutes, it incurs additional cost, and the standard retrieval may exceed the 'within minutes' requirement. Glacier Instant Retrieval is a better and more cost-effective option.
- ✗
Transition to S3 One Zone-IA after 7 days, then to S3 Glacier Deep Archive after 30 days.
Why it's wrong here
S3 One Zone-IA stores data redundantly only within a single Availability Zone, so it does not protect against AZ loss, making it a poor choice for video files that may be important to the company. More critically, S3 Glacier Deep Archive has a standard retrieval time of 12 hours or more and does not support expedited retrieval, which directly violates the requirement that files be accessible 'within minutes.' Even if the 7-day transition were acceptable, the Deep Archive tier fails the retrieval latency SLA, and the combination sacrifices both durability and timely access.
- ✓
Transition to S3 Standard-IA after 7 days, then to S3 Glacier Instant Retrieval after 30 days.
Why this is correct
S3 Standard-IA after 7 days is a sound choice because the files are accessed weekly during that period, and Standard-IA offers the same high durability (99.999999999%) and millisecond latency as Standard while reducing storage costs. After 30 days, transitioning to S3 Glacier Instant Retrieval further cuts storage costs while still providing millisecond retrieval times, so the videos remain instantly accessible on demand. This lifecycle meets the 'within minutes' requirement without incurring the higher retrieval latency or costs of Flexible Retrieval or Deep Archive, making it the most cost-effective and compliant strategy.
- ✗
Transition to S3 Intelligent-Tiering after 7 days.
Why it's wrong here
Intelligent-Tiering automatically moves data between tiers based on access patterns, but it charges a monthly monitoring fee per object that may be cost-prohibitive for many small files. Additionally, it does not transition to the cheapest long-term tier like Glacier Instant Retrieval, so overall costs may be higher.
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
Related to this question
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Same concept, more angles
1 more way this is tested on SOA-C02
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company stores video files in Amazon S3. Files are accessed frequently for the first 30 days, then weekly for the next 6 months, and then rarely after that. Files must be retained for 5 years and any access must be served within minutes. The SysOps administrator wants to minimize storage costs. Which lifecycle policy is most cost-effective?
hard- A.Transition to S3 Standard-Infrequent Access after 30 days, then to S3 Glacier Deep Archive after 6 months.
- B.Transition to S3 One Zone-Infrequent Access after 30 days, then to S3 Glacier after 6 months.
- ✓ C.Transition to S3 Standard-Infrequent Access after 30 days, then to S3 Glacier Instant Retrieval after 6 months.
- D.Transition to S3 Intelligent-Tiering after 30 days, then to S3 Glacier Flexible Retrieval after 6 months.
Why C: Transition objects to S3 Standard-IA after 30 days to match the weekly access pattern at lower cost than S3 Standard. Then transition to S3 Glacier Instant Retrieval after 6 months for data that is rarely accessed but requires retrieval within milliseconds. Glacier Instant Retrieval offers the lowest storage cost among storage classes that support millisecond retrieval, making it ideal for long-term retention with the requirement that any access be served within minutes. Other classes like Glacier Deep Archive do not support expedited retrieval and have retrieval times of 12–48 hours, which fails to meet the within-minutes requirement.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SOA-C02 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 SOA-C02 exam.