Amazon Redshift Data Sharing, a secure and easy way to share live data across Redshift clusters, is now available in AWS GovCloud(US) regions. Ability to share data across Redshift clusters in the same AWS account is generally available and sharing across Redshift clusters that are in separate AWS accounts in the same region is available as preview. Data Sharing enables instant, granular, and high-performance data access across Amazon Redshift clusters without the need to copy or move data. Data Sharing provides live access to the data so that your users always see most up-to-date and consistent information as it is updated in the data warehouse. Data Sharing can be used on your Amazon Redshift RA3 clusters at no additional cost.
Source:: Amazon AWS