Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 212 discussion

S3 Intelligent-Tiering monitors access patterns and moves objects that have not been accessed for 30 consecutive days to the Infrequent Access tier and after 90 days of no access to the Archive Instant Access tier.

I think it cannot be clearly answered because we know that the 'access pattern is variable and changes rapidly', but ultimately it depends on the total number and volume of accesses. All four options meet the "not increase retrieval time" requirement (even Glacier Instant Retrieval has "the same latency and access time as S3 Standard"). If data would be rarely accessed, B would be cheapest. If it would be constantly accessed, C would be cheapest (we'd pay the Intelligent Tiering fee but it would never move anything to a cheaper tier). Inbetween it would be D. But I guess the key is Amazon's clear recommendation to use Intelligent Tiering (A) for "unknown or changing access" patterns, which matches the statement in the question.

S3 intelligent tiering is the most suitable for unpredictable workloads.

S3 Intelligent-Tiering dynamically optimizes storage costs for changing access patterns, ensuring immediate availability and cost-efficiency, which makes it the best fit for the given requirements. Why not the other options? B. S3 Glacier Instant Retrieval: While it provides low retrieval latency, Glacier storage classes are optimized for archival data with infrequent access, not for variable and potentially high-frequency access patterns. C. S3 Standard: This provides immediate availability but is more expensive than Intelligent-Tiering for data with unpredictable access patterns. D. S3 Standard-Infrequent Access (S3 Standard-IA): S3 Standard-IA is optimized for data that is accessed infrequently but requires immediate availability. However, if the access pattern is variable or frequent, it could lead to higher costs due to retrieval and access fees.

A. S3 Intelligent-Tiering: Intelligent-Tiering automatically moves data between storage tiers based on access patterns. However, it incurs additional monitoring and automation costs. For data with a short, predictable retention period (3 months), S3 Standard-IA is more cost-effective. B. S3 Glacier Instant Retrieval: Although Glacier Instant Retrieval offers low-latency access at a lower cost than Standard-IA, it is more suited for archival workloads where retrieval is rare. It is not ideal for workloads with variable access patterns like this one. C. S3 Standard: S3 Standard provides low-latency access, but it is more expensive than S3 Standard-IA for infrequently accessed data. It is better suited for frequently accessed data.

Instant

unknown / changing access patterns = intelligent tiering. memorise

Unpredictable access pattern - Intelligent tiering

Correct Answer A: When data access pattern is not known then Intelligent-tiering can help by monitoring data-access pattern and move object internally accordingly an still ensure faster retrieval. Also There is no object retrieval fees/changes for S3 Intelligent Tier(So cost savings). Option C is not a valid answer because name itself says Infrequent Access(IA): S3 Standard-IA is for data that is accessed less frequently.

Immediate Availability: S3 Standard provides immediate access to the data upon upload. This ensures that the exported database is immediately available for other teams to access without any retrieval delays. Variable Access Pattern: S3 Standard is designed to handle variable access patterns efficiently. It can accommodate rapid changes in access patterns without any impact on performance or latency. Retention Period: S3 Standard is suitable for storing data that needs to remain accessible for up to 3 months. It does not have any retrieval fees or delays, making it ideal for this scenario where immediate access is required.

Feels like half the scenario or answers are missing. Where's the "remove objects after 90 days"? Intelligent Tiering has an upcharge for the provided convenience - does it even make sense, when objects won't remain long enough to be archived? Other classes trade storage cost for request costs. Dependent on how often objects are queried, IA might make sense. Even Glacier Instant Retrieval could come out ahead, given minimal access (and it has 90 days minimum storage duration, exact fit for the description). With no further details provided, this is just throwing darts blindly.

A is the perfect answer - The S3 access pattern for the data is variable and changes rapidly.

With regard to "The S3 access pattern for the data is variable and changes rapidly" Even though Answer B cooudl fifull some requirements, Answer A is For long-lived data that have unpredictable access patterns.

"immediately available" => D is not immediately, and for cost B < A/C

Selected Answer: B https://aws.amazon.com/s3/storage-classes/glacier/instant-retrieval/ "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. El patrón de acceso a los datos es variable y cambia rápidamente = S3 Intelligent-Tiering

very important note , S3 Intelligent-Tiering got no retrival charges