AWS Database Migration Service (AWS DMS) expands its functionality by supporting parallel threads when using Redshift as a target during full load. Amazon Redshift is a fully managed, petabyte-scale data warehouse service in the cloud. You can start with just a few hundred gigabytes of data and scale to a petabyte or more. By taking advantage of the multithreaded full load task settings, you can improve the performance of your initial migration from any DMS supported sources to Amazon Redshift.
Source:: Amazon AWS