You should consider setting this environment variable if the total size of files in your SORT operation is over 1GB.
During a SORT operation, non-key data portions of a record are held in memory depending on the size of SORTSPACE:
| Size of SORTSPACE | Maximum non-key data portion held in memory | 
|---|---|
| 1MB or greater | 5KB | 
| 4MB or greater | 12KB | 
| 8MB or greater | 28KB | 
| 16MB or greater | 62KB | 
The default value is 0.
SORTSCHEME=1