An e-commerce platform generates two types of files that are stored in an Amazon S3 bucket… — AWS Certified Solutions Architect - Associate

An e-commerce platform generates two types of files that are stored in an Amazon S3 bucket:

* Hourly transaction summaries: Average file size of $450\text{ KB}$ . These files are accessed frequently during the first $15\text{ days}$ for financial reconciliation, and rarely thereafter. They must be available for immediate download in the event of an audit over a $1\text{-year}$ retention period.
* Raw server access logs: Average file size of $20\text{ MB}$ . These logs are kept for $90\text{ days}$ for security analysis. They are rarely accessed, but if they are needed for a security investigation, a retrieval time of $3$ to $5\text{ hours}$ is acceptable.

Which combination of Amazon S3 Lifecycle rules will provide the most cost-optimized storage solution? (Select TWO.)

Transition the hourly transaction summaries to Amazon S3 Standard-Infrequent Access (S3 Standard-IA) $30\text{ days}$ after object creation.Answer
Transition the raw server access logs to Amazon S3 Glacier Flexible Retrieval immediately after object creation, and expire them after $90\text{ days}$ .Answer
C
Transition the hourly transaction summaries to Amazon S3 Standard-Infrequent Access (S3 Standard-IA) $15\text{ days}$ after object creation.
D
Transition the raw server access logs to Amazon S3 Standard-Infrequent Access (S3 Standard-IA) immediately after object creation, and expire them after $15\text{ days}$ .
E
Transition the hourly transaction summaries to Amazon S3 Glacier Flexible Retrieval $30\text{ days}$ after object creation.

Answer

The correct combination of lifecycle rules is to transition the hourly transaction summaries to Amazon S3 Standard-IA after

30\text{ days}

, and transition the raw server access logs to Amazon S3 Glacier Flexible Retrieval immediately and expire them after

90\text{ days}

For the hourly transaction summaries, S3 Standard-IA is the most cost-optimized tier because the files are larger than the

128\text{ KB}

transition threshold, are accessed infrequently after

15\text{ days}

, and must support immediate download. Since S3 Lifecycle rules require objects to stay in S3 Standard for a minimum of

30\text{ days}

before transitioning to S3 Standard-IA, transitioning them after

30\text{ days}

is the most cost-effective correct configuration. For the raw server access logs, the

20\text{ MB}

files are large enough for Glacier storage without excessive metadata overhead, can tolerate a

3

5\text{ hour}

retrieval window, and are retained for

90\text{ days}

. Transitioning them immediately to S3 Glacier Flexible Retrieval minimizes costs, and expiring them after

90\text{ days}

aligns with the retention requirement while satisfying the

90\text{-day}

minimum storage duration of Glacier Flexible Retrieval, avoiding early deletion penalties.

Step-by-Step Solution

Analyze requirements for the hourly transaction summaries.

The transaction summaries require immediate download and a

1\text{-year}

retention. They are accessed rarely after

15\text{ days}

. Their average size is

450\text{ KB}

, which is above the

128\text{ KB}

minimum size limit for S3 Standard-IA transition.

To identify if S3 Standard-IA is the correct tier and determine the size and retrieval constraints.

Check the S3 Standard-IA transition constraint.

S3 Lifecycle configurations require objects to remain in S3 Standard for at least

30\text{ days}

before transitioning to S3 Standard-IA or S3 One Zone-IA.

To determine the earliest possible transition window for S3 Standard-IA.

Analyze requirements for the raw server access logs.

The logs are

20\text{ MB}

each, are kept for

90\text{ days}

, and can tolerate a retrieval time of

3

5\text{ hours}

. This makes S3 Glacier Flexible Retrieval (standard retrieval) the most cost-effective tier.

To determine the correct target tier based on file size, access frequency, retrieval window, and retention period.

Verify Glacier minimum storage duration constraints.

S3 Glacier Flexible Retrieval has a

90\text{-day}

minimum storage duration. Expiring the logs after

90\text{ days}

matches the retention requirement and avoids early deletion penalties.

To verify that deleting the logs at

90\text{ days}

does not trigger extra charges.

Key Concept

Selecting S3 storage tiers based on access frequency, file size, retrieval time, and S3 Lifecycle minimum transition and storage duration rules.

Question

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

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