An e-commerce company stores transaction files in an Amazon S3 bucket using two prefixes: … — AWS Certified Solutions Architect - Associate

An e-commerce company stores transaction files in an Amazon S3 bucket using two prefixes: `invoices/` and `checkout_logs/`.

* Invoices (`invoices/`): PDF invoices with an average size of $2.5\text{ MB}$ . They are frequently accessed during the first $30$ days, occasionally accessed between days $30$ and $90$ , and must be retained for $7$ years for tax compliance.
* Checkout Logs (`checkout_logs/`): Text files with an average size of $15\text{ KB}$ . They are used for troubleshooting failed checkouts, frequently accessed during the first $10$ days, and are no longer needed after $25$ days.

Which combination of lifecycle rules meets these requirements most cost-effectively?

For the `invoices/` prefix, transition objects to S3 Standard-IA after $30$ days, and transition them to S3 Glacier Deep Archive after $90$ days. For the `checkout_logs/` prefix, expire objects after $25$ days.Answer
B
For the `invoices/` prefix, transition objects to S3 Standard-IA after $30$ days, and transition them to S3 Glacier Deep Archive after $90$ days. For the `checkout_logs/` prefix, transition objects to S3 Standard-IA after $10$ days, and expire them after $25$ days.
C
For the `invoices/` prefix, transition objects to S3 Glacier Deep Archive after $30$ days. For the `checkout_logs/` prefix, transition objects to S3 Standard-IA after $10$ days, and expire them after $25$ days.
D
For the `invoices/` prefix, transition objects to S3 Standard-IA after $30$ days, and transition them to S3 Glacier Deep Archive after $90$ days. For the `checkout_logs/` prefix, transition objects to S3 Standard-IA after $10$ days, and transition them to S3 Glacier Deep Archive after $25$ days.

Answer

Configure a lifecycle policy that transitions Customer Invoice PDFs (`invoices/`) to S3 Standard-IA after

30

days and to S3 Glacier Deep Archive after

90

days, while expiring Temporary Checkout Session Logs (`checkout_logs/`) after

25

days without transitioning them.

The correct option is to transition the larger invoices (

2.5\text{ MB}

) to S3 Standard-IA after

30

days and to S3 Glacier Deep Archive after

90

days, while simply expiring the checkout logs (

15\text{ KB}

) after

25

days. This is cost-effective because the invoices exceed the

128\text{ KB}

minimum size requirement for infrequent and archive tiers and are kept long-term. Meanwhile, the checkout logs are too small and are deleted before the

30

-day minimum storage duration of S3 Standard-IA, meaning transition would result in minimum storage and capacity charge penalties.

Step-by-Step Solution

Analyze the access pattern and size of the invoice PDFs.

The PDFs are

2.5\text{ MB}

(greater than the

128\text{ KB}

S3 Standard-IA minimum capacity limit) and are only occasionally accessed after

30

days and rarely after

90

days. They must be kept for

7

years.

This justifies transitioning them to S3 Standard-IA after

30

days and to S3 Glacier Deep Archive after

90

days to minimize storage costs over the

7

-year retention period.

Analyze the access pattern, size, and lifespan of the checkout logs.

The logs are

15\text{ KB}

(well below the

128\text{ KB}

S3 Standard-IA minimum capacity limit) and must be deleted after

25

days.

Transitioning these logs to S3 Standard-IA or any archive tier is inefficient because they do not meet the minimum object size (

128\text{ KB}

) and will trigger a minimum storage duration penalty (

30

days for S3 Standard-IA) since they are deleted before that period.

Select the lifecycle policy that optimizes costs for both data sets.

Invoice PDFs are transitioned through Standard-IA to Glacier Deep Archive, while checkout logs are kept in S3 Standard and deleted at

25

days.

This avoids unnecessary storage penalties and capacity surcharges for the small, short-lived logs, while maximizing cost savings for the large, long-lived invoice files.

Key Concept

S3 Lifecycle policies must account for object size minimums (such as

128\text{ KB}

for S3 Standard-IA) and minimum storage durations (such as

30

days for S3 Standard-IA and

180

days for S3 Glacier Deep Archive) to avoid cost penalties.

Question

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

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