Examples of the DUMMY parameter

Example 1

//OUTDD1  DD  DUMMY,DSNAME=X.X.Z,UNIT=3390,
//            SPACE=(TRK,(10,2)),DISP=(,CATLG)

DD statement OUTDD1 defines a dummy data set. The other parameters coded on the statement are checked for syntax but not used.

Example 2

//IN1  DD  DUMMY,DCB=(BLKSIZE=800,LRECL=400,RECFM=FB)

DD statement IN1 defines a dummy data set. The DCB parameter supplies data control block information not supplied in the program. Without it, the step might be abnormally terminated.

Example 3

//IN2 DD  DUMMY,DSNAME=ELLN,DISP=OLD,VOLUME=SER=11257,UNIT=3390

When calling a cataloged procedure that contains DD statement IN2 in procedure step STEP4, you can nullify the effects of the DUMMY parameter by coding:

//STEP4.IN2  DD  DSNAME=ELLN

Example 4

//TAB  DD  DSNAME=APP.LEV12,DISP=OLD

If you call a cataloged procedure that contains DD statement TAB in procedure step STEP1, you can make this DD statement define a dummy data set by coding:

//STEP1.TAB  DD  DUMMY

Example 5

//MSGS  DD  SYSOUT=A

If you call a cataloged procedure that contains the DD statement MSGS in procedure step LOCK, you can make this DD statement define a dummy data set by coding:

//LOCK.MSGS  DD  DUMMY