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Allocating Data Sets

MVS provides a direct connection between the filename used in the program and the corresponding data set name used in the JCL. For example, for SYSUT1 in a COBOL program:

SELECT INFILE ASSIGN TO UT-S-SYSUT1

connects to

//SYSUT1 DD DSN=DSNAME1,DISP=OLD

and allocates to the program the PC file representing the data set named DSNAME1.

And, for SYSUT2:

SELECT OUTFILE ASSIGN TO UT-S-SYSUT2

connects to

//SYSUT2 DD DSN=DSNAME2,DISP=(NEW,CATLG),...

and allocates to the program a PC file representing the data set named DSNAME2. The file is created and cataloged automatically when the jobstream is run.

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