Enabling memory-based data set ENQ management

The MEMDSENQMGMT function of z/OS® enables jobs and subsystems to use memory-based data set ENQ management for dynamically allocated data sets, which is faster than scheduler work area-based (SWA-based) data set ENQ management. When you enable this function on your z/OS system, data set ENQs for dynamically allocated data sets are managed in memory.

To enable the MEMDSENQMGMT function, use one of the following methods:

• Update the ALLOCxx PARMLIB member to set the SYSTEM MEMDSENQMGMT value to ENABLE:

SYSTEM MEMDSENQMGMT(ENABLE)

This method is recommended because the setting remains in effect across IPLs.

• Issue the system command SETALLOC SYSTEM,MEMDSENQMGMT=ENABLE, and restart IMS to make the change effective.