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how can we override data definitions in jcl.
can any one give detailed example

Question Posted / suputhru

Answer Posted / suputhru

meenu u r corrrrect.

STEPNAME.DDNAME DD PARAMETERS;
in place of parameters we can write the parameters which we want to override

//PROC1 PROC
//STEP1…..
//DD1 DD DSN=FILE1,DISP=SHR
…
…
//
Now we can override dd parameter disp=shr to DISP=OLD.
//JOB1 JOB..
//PROCLIB…
//STEP001 EXEC PROC1
//STEP1.DD1 DD DSN=FILE1,DISP=OLD.

SYMBOLIC parameters: used to orverride parameters on the DD statement.
They can be used in cataloged and instream procs.
//ddname DD &parameter

Values assigned at proc and exec statements.

//JOB1 JOB..
//PROC1 PROC DISPO=NEW ----here dd parameter value assigned at proc.
//STEP1 EXEC PROC1
//DD1 DD DSN=FILE1,DISP=&DISPO ------it means DISP=NEW.

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