Figure 1. RELEASE Format
RELEASE=ON (the program default) turns on the RLSE operand in the SPACE parameter of the SORTWK DD statements. This will cause unused space to be released from sortwork units during execution time.
Specify RELEASE=OFF to instruct MFX to turn off the RLSE operand in the SPACE parameter of the SORTWK DD statement. In this case, MFX will not release unused space from the sortwork units during sort execution.