AWS S3 interview questions

31) How can I setup a trash, recycle bin, or rollback window on my Amazon S3 objects to recover from deletes and overwrites?
You can use Lifecycle rules along with Versioning to implement a rollback window for your Amazon S3 objects. For example, with your versioning-enabled bucket, you can set up a rule that archives all of your previous versions to the lower-cost Glacier storage class and deletes them after 100 days, giving you a 100-day window to roll back any changes on your data while lowering your storage costs.

32) What is S3 Intelligent-Tiering?
Amazon S3 Intelligent-Tiering (S3 Intelligent-Tiering) is an S3 storage class designed to optimize storage costs by automatically moving data to the most cost-effective access tier, without operational overhead. It is the only cloud storage that delivers automatic cost savings by moving data on a granular object level between access tiers when access patterns change.There are two ways to get data into S3 Intelligent-Tiering. You can directly PUT into S3 Intelligent-Tiering by specifying INTELLIGENT_TIERING in the x-amz-storage-class header or set lifecycle policies to transition objects from S3 Standard or S3 Standard-IA to S3 INTELLIGENT_TIERING.

33) Is there a minimum duration for S3 Intelligent-Tiering?
Yes. The S3 Intelligent-Tiering storage class has a minimum storage duration of 30 days, which means that data that is deleted, overwritten, or transitioned to a different S3 Storage Class before 30 days will incur the normal usage charge plus a pro-rated charge for the remainder of the 30-day minimum.

34) What is S3 Standard-Infrequent Access?
Amazon S3 Standard-Infrequent Access (S3 Standard-IA) is an Amazon S3 storage class for data that is accessed less frequently but requires rapid access when needed. S3 Standard-IA offers the high durability, throughput, and low latency of the Amazon S3 Standard storage class, with a low per-GB storage price and per-GB retrieval fee.

35) Is there a minimum object storage charge for S3 Standard-IA?
S3 Standard-IA is designed for larger objects and has a minimum object storage charge of 128KB. Objects smaller than 128KB in size will incur storage charges as if the object were 128KB. For example, a 6KB object in S3 Standard-IA will incur S3 Standard-IA storage charges for 6KB and an additional minimum object size fee equivalent to 122KB at the S3 Standard-IA storage price.

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