This document offers information and recommendations on tuning DFSORT. It provides advice to the system programmer on setting DFSORT's installation default parameters as well as to the application programmer on improving the performance of individual DFSORT applications. It describes the main indicators used to measure performance and emphasizes the advantages of using DFSORT's Blockset technique for improved performance. Since sort applications tend to be more complex and time-consuming than merge or copy applications, this document concentrates on techniques for improving the performance of sort applications. However, many of these techniques are also appropriate for copy and merge applications.

This document also assumes that DFSORT's most efficient technique is used. See Blockset technique for more information on ensuring that Blockset is used.