Relationship to other parameters

Do not code the following parameters with the DSNAME parameter.

DDNAME
DYNAM
QNAME

Do not code the DCB IPLTXID subparameter with the DSNAME parameter.

Reserved Data Set Names: Do not code the following data set names on the DSNAME parameter with the *, DATA, or SYSOUT parameter (an in-stream or sysout data set); the names are reserved for system use.

JESJCL
JESJCLIN
JESMSGLG
JESYSMSG

With DD AMP parameter: When you code an AMP parameter for a VSAM data set, do not code a DSNAME:

That contains parentheses, a minus (hyphen), or a plus (+) sign.
That is in the form for ISAM.
That is in the form for PAM (partitioned access method).
That names a generation data group.

With DD DISP parameter: You can create a permanent data set by specifying a qualified or unqualified data set name, the disposition must be other than DELETE.

The following example illustrates how to create a permanent data set:

//REPORT   DD DSN=DEHART.APAR.REPORT,SPACE=(CYL,(5,5)),
//            DISP=(NEW,CATLG),UNIT=SYSALLDA,
//            DCB=(LRECL=121,RECFM=FBA,BLKSIZE=1210)

You can create a temporary data set by specifying a:

&&dsname or by omitting the DSNAME parameter
Qualified or unqualified data set name and specifying, either explicitly or implicitly, DISP=(NEW,DELETE).

The following two examples illustrate how to create a temporary data set:

//MYDD1    DD DSN=TEMP1,UNIT=3480,DISP=(,DELETE),SPACE=(TRK,(1,1))

//DD2      DD UNIT=SYSALLDA,SPACE=(TRK,1),DISP=(NEW,PASS)

Note: When you code a disposition of CATLG for a data set, do not code a DSNAME name in apostrophes.