AWS Certified Solutions Architect Associate SAA-C03 Practice Question
Your client's application experiences unpredictable and intermittent periods of intense read and write operations, driven by seasonal events. The application's data storage must be cost-effective, handle sudden increases in demand, and automatically revert to a cost-saving state during off-peak times without manual intervention. Which AWS service should be used for the primary storage of application data to meet these requirements?
Amazon S3 Intelligent-Tiering is the only S3 storage class that monitors object-level access patterns and automatically moves data between frequent-access, infrequent-access, and archive tiers. This keeps objects in the lowest-cost tier that still delivers millisecond access when demand suddenly rises, with no performance penalty and no retrieval fees.
S3 Standard-IA and S3 One Zone-IA have lower per-GB storage prices than S3 Standard, but they charge per-GB retrieval fees and do not change tier automatically, so spikes in access can drive up costs.
Amazon EFS provides fully elastic file-system storage and (through EFS Lifecycle Management and EFS Intelligent-Tiering) can also move files between Standard and IA/Archive classes. However, EFS is a POSIX-compliant network file system that typically costs more per-GB than S3 object storage and is most appropriate when the workload needs shared file semantics. For object-based application data with unpredictable access, S3 Intelligent-Tiering is usually the most cost-effective choice.
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