Amazon Redshift Data Sharing, a secure and easy way to share live data across Redshift clusters, is now generally available. Data Sharing enables instant, granular, and high-performance data access across Amazon Redshift clusters within an AWS account, 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