SOA-C02 Cost and Performance Optimization Practice Question

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 logs to S3 Glacier Deep Archive after 30 days, and transition user uploads to S3 Standard-IA after 30 days, then to Glacier Deep Archive after 90 days.

  Why this is correct

  This is correct because logs are typically append-only and rarely accessed after the first 30 days, making S3 Glacier Deep Archive the lowest-cost storage class while satisfying the 3-year retention requirement. User uploads, however, are frequently accessed in the month after upload, so S3 Standard-IA after 30 days reduces cost without sacrificing retrieval performance; then transitioning to Glacier Deep Archive after 90 days aligns with the access drop-off and keeps lifecycle costs minimal.

• ✗

  Transition user uploads to S3 Glacier Deep Archive after 30 days, and transition logs to S3 Glacier after 90 days.

  Why it's wrong here

  This is wrong because transitioning user uploads to S3 Glacier Deep Archive after only 30 days ignores that users may still need frequent access after the first month—Deep Archive retrieval can take up to 12 hours, so it is not suitable for data that might be accessed on demand. Additionally, placing logs into S3 Glacier after 90 days is suboptimal because Glacier is more expensive than Glacier Deep Archive and logs should be archived to the cheapest tier earlier, not delayed to 90 days, to maximize cost savings while still meeting retention.

• ✗

  Move logs to S3 Glacier Deep Archive after 30 days, and delete user uploads after 1 year.

  Why it's wrong here

  This is wrong because deleting user uploads after 1 year would destroy data that has no stated expiration or retention limit—there is no justification for permanent deletion, and doing so could violate compliance or customer-expectation requirements. While transitioning logs to S3 Glacier Deep Archive after 30 days is a sound cost-saving action, the lifecycle policy is invalid as a whole because the user uploads part deletes data prematurely instead of moving it to cheaper storage tiers.

• ✗

  Transition logs to S3 Standard-IA after 30 days, and transition user uploads to S3 One Zone-IA after 30 days.

  Why it's wrong here

  This is wrong because moving logs to S3 Standard-IA after 30 days does not achieve the maximum cost reduction—logs are rarely read after being written, so sending them directly to Glacier Deep Archive after 30 days would cut storage costs far more than Standard-IA, which is meant for infrequent but immediate access. S3 One Zone-IA is also inappropriate for user uploads because it stores data in a single Availability Zone, offering only 99.5% durability versus the 99.999999999% of standard classes; if that AZ fails, the user uploads are permanently lost, which is not acceptable for customer data.

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