This Natural profile and session parameter determines whether a memory dump is to be generated in the case of an abnormal termination during the Natural session.

Possible settings	ON	A memory dump is produced in the case of an abnormal termination (TP-monitor dump data set or SYSUDUMP in z/OS batch mode or under TSO). Then the Natural session terminates with the error message NAT9967 or NAT9974.
	OFF	No memory dump is produced. Notes: In batch mode, subsequent action taken by Natural is determined by the setting of the CC profile parameter. In online mode, Natural responds with the error message NAT0950, NAT0953, NAT0954, NAT0955 or NAT0956. For further information on the abnormal termination, you can use the system command DUMP.
	SNAP	This setting forces an immediate dump in the case of an abnormal termination during a Natural session. Note The Natural session continues as with DU=OFF after the dump has been taken.
	FORCE	This setting forces an immediate dump in the case of an abnormal termination during a Natural session and terminates the Natural session immediately. This is useful for testing purposes in some environments. Note If Natural is LE enabled, Natural terminates the Natural session immediately without a dump and passes control to the LE error handling. It is therefore strongly recommended to specify the LE run-time option TERMTHDACT(UAIMM) to get all the required diagnostic information.
	ABEND	This works as with DU=ON, except that the session is terminated with the abend occurred - instead of the error message NAT9974. Note DU=ABEND is not available with the Natural session parameter DU.
Default setting	OFF
Dynamic specification	yes
Specification within session	yes	Applicable statement:	SET GLOBALS
		Applicable command:	GLOBALS

Notes:

1. Within a Natural session, the profile parameter DU can be overridden by the session parameter DU.
2. Setting the DU profile parameter may impair the system performance considerably, due to I/O processing on the dump data set.
3. Be careful when you use this parameter, because all programs and subroutines currently active for the current user will be retained in the Natural buffer pool.
4. DU=ON, DU=SNAP or DU=FORCE may cause buffer fragmentation which may result in a significant degradation in system performance.
5. Profile parameter DUE can be used to get a storage dump for specific errors.
6. Under Natural Security, the setting of this parameter can be overridden by the Session Parameters option of the Library Profile.