JCL Standards

Example DD Statement


//AB1005A  EXEC  GO,MEMBER=AB1005A,VER=PROD,TBLVER=PROD
//TMPFILE  DD    DSN=&&TEMP01,
//         DISP=(NEW,PASS),
//         UNIT=SYSDA,
//         SPACE=(TRK,(100,50),
//         DCB=(RECFM=FB,LRECL=80,BLKSIZE=6160)

This example shows use of a temporary file being created in this step. Note that the file name begins with two ampersands (&&). This indicates it is a temporary file residing on disk. For a temporary file residing on tape, only one ampersand would be used. The naming standard for temporary files is that the name should be preceded by one or two ampersands and TEMPxx, where "xx" is a sequential number. Temporary datasets should be sequentially numbered according to which is created first. Valid temporary file names would be:

&&TEMP01
&TEMP05
&&TEMP21

Notes:

The DCB is usually unnecessary if the file is created from an Easytrieve Plus program.
No RLSE keywork is needed in the SPACE parameter
The SPACE parameter is unnecessary for tape datasets
No LABEL parameter is needed
The unit field for disk should use SYSDA rather than DISK

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