AWS Certified Data Engineer Associate DEA-C01 Practice Question

An e-commerce company ingests 300 GB of clickstream logs into an Amazon S3 bucket every day. The logs are queried frequently during the first 30 days, occasionally between days 31-90, and very rarely afterward. Compliance rules require that the data remain available for exactly two years and then be removed automatically. Which Amazon S3 Lifecycle configuration provides the lowest storage cost while meeting these requirements and keeping operational effort to a minimum?

Enable S3 Intelligent-Tiering and set a single expiration action to delete objects after 730 days.
Configure a Lifecycle rule to transition objects to S3 Glacier Instant Retrieval after 30 days, then to S3 Standard-IA after 90 days, and expire them after 730 days.
Create two Lifecycle rules: one copies objects to a separate archive bucket with S3 Replication after 90 days, and a second rule deletes objects manually each month after two years.
Create one Lifecycle rule that transitions objects to S3 Standard-IA after 30 days, then to S3 Glacier Deep Archive after 90 days, and expires them after 730 days.

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Answer Description

The workload needs millisecond access for the first 30 days, lower-cost infrequent-access storage afterward, and the lowest-cost archival storage once access becomes rare. Transitioning current object versions to S3 Standard-IA after 30 days still allows quick access at roughly half the monthly storage cost of S3 Standard in most AWS Regions. Moving the objects to S3 Glacier Deep Archive after 90 days provides the lowest long-term price because restore latency is not a concern. Finally, setting an expiration action at 730 days (two years) satisfies the compliance deletion requirement. A single Lifecycle rule that performs these two transitions and the final expiration delivers the required retention policy with no manual intervention. The other options either keep the data in a more expensive storage class, place it in the wrong class order, or add unnecessary complexity that does not lower cost further.

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