Improving performance

DFSORT is designed to optimize performance automatically. It sets optimization variables (such as buffer sizes) and selects the most efficient of several sorting and merging techniques.

You can improve DFSORT performance in several ways:

Design your applications to maximize performance:
- Directly invoke DFSORT processing
- Plan ahead when designing new applications
- Specify efficient sort/merge techniques
- Specify input/output data set characteristics accurately
- Use extended format data sets
- Use DFSMSrmm-managed tapes, or ICETPEX
- Specify devices that improve elapsed time
- Use options that enhance performance
- Use DFSORT's fast, efficient productivity features
- Avoid options that degrade performance.
Use main storage efficiently
Allocate temporary work space efficiently
Use Hipersorting
Sort with data space
Use memory object sorting
Use ICEGENER instead of IEBGENER
Use DFSORT's Performance Booster for The SAS System
Use DFSORT's BLDINDEX support.

The DFSORT z/OS DFSORT Tuning Guide provides additional information related to many of the topics covered in this chapter.