A financial services firm processes two types of data files stored in a single Amazon S3 b… — AWS Certified Solutions Architect - Associate

A financial services firm processes two types of data files stored in a single Amazon S3 bucket:

* Transaction logs: Average size of $15\text{ KB}$ . These files are accessed frequently for the first $30\text{ days}$ after creation, and then must be retained for $7\text{ years}$ for auditing. When needed for audits, they must be retrievable within minutes.
* Monthly statements: Average size of $5\text{ MB}$ . These files are accessed frequently for the first $30\text{ days}$ after creation, occasionally accessed for the next $60\text{ days}$ (requiring millisecond access times), and then must be retained for $7\text{ years}$ with an acceptable retrieval time of up to $5\text{ hours}$ .

Which combination of S3 Lifecycle configuration actions will meet these requirements in the most cost-effective manner? (Select TWO.)

Configure a lifecycle policy for the transaction logs to retain them in Amazon S3 Standard for the entire $7\text{-year}$ duration.Cevap
Configure a lifecycle policy for the monthly statements to transition them to Amazon S3 Standard-Infrequent Access (S3 Standard-IA) after $30\text{ days}$ , and to Amazon S3 Glacier Flexible Retrieval after $90\text{ days}$ .Cevap
C
Configure a lifecycle policy for the monthly statements to transition them to Amazon S3 Standard-IA after $30\text{ days}$ , and then to Amazon S3 Glacier Flexible Retrieval after $45\text{ days}$ .
D
Configure a lifecycle policy for the monthly statements to transition them to Amazon S3 Standard-IA after $30\text{ days}$ , and then to Amazon S3 Glacier Deep Archive after $90\text{ days}$ .
E
Configure a lifecycle policy for the transaction logs to transition them to Amazon S3 Standard-IA after $30\text{ days}$ .

Cevap

The correct strategy is to retain the transaction logs in Amazon S3 Standard for the entire duration, and to transition the monthly statements to S3 Standard-IA after

30\text{ days}

and then to S3 Glacier Flexible Retrieval after

90\text{ days}

For the monthly statements, transitioning to S3 Standard-IA after

30\text{ days}

provides the required millisecond access. Waiting until day

90

to transition them to S3 Glacier Flexible Retrieval ensures the files remain in S3 Standard-IA for

60\text{ days}

, satisfying the

30\text{-day}

minimum duration and avoiding any early transition penalties. For the transaction logs, keeping them in S3 Standard for the entire period is most cost-effective. Transitioning these

15\text{ KB}

logs to S3 Standard-IA would force billing at the

128\text{ KB}

minimum size, and transitioning them to S3 Glacier Flexible Retrieval adds

40\text{ KB}

minimum size billing plus a combined

40\text{ KB}

of metadata overhead, making both transitions more expensive than keeping them in S3 Standard.

Adım Adım Çözüm

Analyze file sizes and access patterns to identify constraints.

Transaction logs are very small (

15\text{ KB}

) and need rapid retrieval. Monthly statements are larger (

5\text{ MB}

) and require millisecond access for the first

90\text{ days}

, followed by retrieval within

5\text{ hours}

for

7\text{ years}

Correctly identifying object sizes and access patterns determines whether transition rules will trigger size-based cost penalties.

Evaluate the cost impact of S3 Standard-IA and Glacier metadata constraints on transaction logs.

Transitioning

15\text{ KB}

transaction logs to S3 Standard-IA triggers the

128\text{ KB}

minimum billing size constraint. Transitioning them to Glacier Flexible Retrieval incurs a

40\text{ KB}

minimum billing size along with

32\text{ KB}

Glacier metadata and

8\text{ KB}

Standard metadata charges per object. This combined overhead makes transition more expensive than keeping them in S3 Standard.

Avoiding storage class transitions for objects significantly smaller than the minimum billing threshold is a critical cost-optimization best practice.

Determine the optimal transition schedule for monthly statements.

Transitioning to S3 Standard-IA at day

30

and then to S3 Glacier Flexible Retrieval at day

90

keeps the statements in S3 Standard-IA for

60\text{ days}

(which exceeds the

30\text{-day}

minimum storage duration) and provides

3

5\text{ hour}

retrieval times (via standard retrieval) for long-term archiving.

This satisfies the access patterns while avoiding the early transition charge associated with the

30\text{-day}

minimum storage duration of S3 Standard-IA.

Anahtar Kavram

S3 storage class cost-efficiency is heavily influenced by minimum object storage sizes, minimum storage durations, and metadata overhead, particularly for small objects.

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