Amazon Redshift now provides an efficient and automated way to maintain sort order of the data in Redshift tables to continuously optimize query performance. The new automatic table sort capability offers simplified maintenance and ease of use without compromising performance and access to Redshift tables. Automatic table sort complements Automatic Vacuum Delete and Automatic Analyze and together these capabilities fully automate table maintenance. Automatic table sort is now enabled by default on Redshift tables where a sort key is specified.
Source:: Amazon AWS