DAS-C01 · Question #91
An online retailer needs to deploy a product sales reporting solution. The source data is exported from an external online transaction processing (OLTP) system for reporting. Roll-up data is…
The correct answer is B. Store the source data initially in the Amazon S3 Glacier storage class. D. Store the daily roll-up data initially in the Amazon S3 Standard storage class. Two independent data sets have different access patterns. For source data exports (answer B): they must be retained 5 years but are only queried within the first 90 days. Storing them initially in S3 Glacier (with a lifecycle policy that starts in a queryable tier for 90 days…
Question
An online retailer needs to deploy a product sales reporting solution. The source data is exported from an external online transaction processing (OLTP) system for reporting. Roll-up data is calculated each day for the previous day's activities. The reporting system has the following requirements:
- Have the daily roll-up data readily available for 1 year.
- After 1 year, archive the daily roll-up data for occasional but immediate access.
- The source data exports stored in the reporting system must be retained for 5 years. Query
access will be needed only for re-evaluation, which may occur within the first 90 days. Which combination of actions will meet these requirements while keeping storage costs to a minimum? (Choose two.)
Options
- AStore the source data initially in the Amazon S3 Standard-Infrequent Access (S3 Standard-IA)
- BStore the source data initially in the Amazon S3 Glacier storage class.
- CStore the daily roll-up data initially in the Amazon S3 Standard storage class.
- DStore the daily roll-up data initially in the Amazon S3 Standard storage class.
- EStore the daily roll-up data initially in the Amazon S3 Standard-Infrequent Access (S3 Standard-
How the community answered
(34 responses)- A9% (3)
- B47% (16)
- C29% (10)
- E15% (5)
Explanation
Two independent data sets have different access patterns. For source data exports (answer B): they must be retained 5 years but are only queried within the first 90 days. Storing them initially in S3 Glacier (with a lifecycle policy that starts in a queryable tier for 90 days then moves to Glacier Deep Archive) minimizes long-term cost while satisfying the retention requirement. S3 Standard-IA (option A) would be more expensive over 5 years. For daily roll-up data (answer D): it must be immediately available for 1 year, then available on demand afterward. Starting in S3 Standard and applying a lifecycle rule to transition to S3 Glacier Instant Retrieval after 1 year satisfies both the immediate-access requirement and the cost goal. S3 Standard-IA (option E) is cheaper than Standard but adds retrieval fees for frequently accessed active data in the first year.
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