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Following is the list of DynamoDB APIs:

Cross-region replication currently supports single master mode. A single master has one master table and one or more replica tables. There are no limits on the number of replicas.

A DynamoDB Streams reader is created for each replica table and copies data from the master table, keeping the replicas in sync.

DynamoDB cross-region replication allows you to maintain identical copies (called replicas) of a DynamoDB table (called master table) in one or more AWS regions.

After you enable cross-region replication for a table, identical copies of the table are created in other AWS regions. Writes to the table will be automatically propagated to all replicas.

DynamoDB Triggers allow you to execute custom actions (as code) based on item-level updates on a DynamoDB table.

Some use cases of DynamoDB Triggers include sending notifications, updating an aggregate table, and connecting DynamoDB tables to other data sources.

A placement group is a logical grouping of instances within a single AZ.

Placement groups are recommended for applications that benefit from low network latency, high network throughput, or both. A hadoop cluser or casandra cluster where nodes have to communicate fast between each other are examples. 

Snowball is a transport solution in AWS for petabyte-scale data.

Snowball uses secure appliances that will be delivered and later collected back, to transfer large amounts of data into and out of the AWS cloud.

Transferring data with Snowball is secure, and costs much less compared to high-speed Internet.

AWS Storage Gateway is a hybrid cloud storage that provides seamless and secure integration with local on-premises IT infrastructure, and optimized data transfer.

Customers can use it in remote offices and datacenters for hybrid cloud workloads such as migration, storage tiering etc.

The Storage Gateway virtual appliance can connect to your local infrastructure as a file server, or as a local disk volume etc.

What is Amazon S3?

http://docs.aws.amazon.com/AmazonS3/latest/dev/Welcome.html

Introduction to Amazon S3

http://docs.aws.amazon.com/AmazonS3/latest/dev/Introduction.html

Errors and Responses

http://docs.aws.amazon.com/AmazonS3/latest/API/ErrorResponses.html

S3 CloudWatch Metrics

You can use the AWS Management Console to enable the generation of 1-minute CloudWatch metrics for your S3 bucket or configure filters for the metrics using a prefix or object tag. You may also call the S3 PUT Bucket Metrics API.

Storage metrics will be available in CloudWatch within 15 minutes of being enabled.

S3 Analytics

S3 Analytics feature automatically identifies infrequent access patterns to help transition storage to S3-IA or Glacier.

Storage class analysis also provides daily visualizations of storage usage on the Management Console and can be exported to a S3 bucket to analyze using any BI tools such as AWS QuickSight.

You can configure a storage class analysis policy to monitor an entire bucket, a prefix, or object tag.