Exam AWS Certified Data Engineer - Associate DEA-C01 topic 1 question 70 discussion

Although C is more cost-effective, because of "must be able to retrieve all data within milliseconds" will go with D

Based on this docs https://docs.aws.amazon.com/AmazonS3/latest/userguide/intelligent-tiering-overview.html D will be appropriate as it allows for instant retrieval

Staying with "D"... The Amazon S3 Glacier Deep Archive storage class is designed for long-term data archiving where data retrieval times are flexible. It does not offer millisecond retrieval times. Instead, data retrieval from S3 Glacier Deep Archive typically takes 12 hours or more. For millisecond retrieval times, you would use the S3 Standard, S3 Standard-IA, or S3 One Zone-IA storage classes, which are designed for frequent or infrequent access with low latency.

I am confused with C or D

C is correct. "Amazon S3 Glacier Instant Retrieval is an archive storage class that delivers the lowest-cost storage for long-lived data that is rarely accessed and requires retrieval in milliseconds." https://aws.amazon.com/s3/storage-classes/glacier/instant-retrieval/

least operation overhead, D

The correct answer may be D. Intelligent tiering's default access tier is: 1. accessed less than 30 days: frequent access tier 2. not accessed in 30-90 days: Infrequent Access tier 3. not accessed more than 90 days: Archive Instant Access tier Other tiers require more retrieve time need activation. https://docs.aws.amazon.com/AmazonS3/latest/userguide/intelligent-tiering-overview.html

Amazon S3 Glacier Instant Retrieval is an archive storage class that delivers the lowest-cost storage for long-lived data that is rarely accessed and requires retrieval in milliseconds

A few remarks: Data should be retrieved in ms. This means all the options with Glacier are wrong: BC For D how you can set the S3 intelligent-Tiering if the current class is Standard? I guess you need a lifecycle policy. Which leaves only A as an option. Thoughts?

D. is correct

Option C. Use S3 Intelligent-Tiering. Activate the Deep Archive Access tier. By using S3 Intelligent-Tiering and activating the Deep Archive Access tier, the company can optimize S3 storage costs with minimal operational overhead. S3 Intelligent-Tiering automatically moves objects between four access tiers, including the Deep Archive Access tier, based on changing access patterns and cost optimization. This eliminates the need for manual lifecycle policies and constant refinement, as the storage class is adjusted automatically based on data access patterns, resulting in cost savings while ensuring quick access to all data when needed.

Option D, using S3 Intelligent-Tiering with the default access tier, will meet the requirements best. It provides a hands-off approach to storage cost optimization while ensuring that data is available for analytics workloads within the required timeframe.