Amazon DynamoDB on-demand and transactions now available in the AWS GovCloud (US) Regions
Amazon DynamoDB on-demand capacity mode and transactions are now available in the AWS GovCloud (US) Regions. On-demand capacity mode is a flexible capacity mode for DynamoDB capable of serving thousands of requests per second without requiring capacity planning. Transactions provide developers atomic, consistent, isolated, and durable (ACID) operations in DynamoDB so that they can maintain data correctness in applications more easily.
Source:: Amazon AWS