JCL Mainframe Advanced Tips on Procedures or Procs

Procedure we also call it as PROC. Usually PROC acts as a routine. It reduces coding the same logic multiple times. With this we can override parameters, like DD data set names, PARM parameters(using symbolic parameters).

Important Points:

  • Restart a PROC step by RESTART=jclstepname.procstepname
  • BothcatalogedPROCsandInstreamPROCs expanded during execution of JCL. In the spool we can see how the ROCs are expanded.

Related Posts

Cataloged procedureInstream procedureMeaning
////Statement from input JCL.
XX++Statement from procedure.
X/+/Procedure statement that you modified.
XX*++*Procedure statements, other than comment statements, that were converted to comments (probably because of an error).
******Comments and JES2/JES3 control statements
  • INCLUDE statement, we can use it to copy a portion of STEP information.
//abcde      DD  SYSOUT=* 
//       INCLUDE   name
//name       DD    DSN=psname
  • Symbolic parameters, we can use to nullify a value or assign a new value in the PROC. For example, PARM=& (in the proc). You need to modify it in JCL as CLASS= , it will nullify. Else CLASS=’*’, it will assign default class.
  • Maximum number of Instream PROC we can nest in a JCL is 15
  • We cannot call a PROC from a PROC

Recent Posts

Author: Srini

Experienced software developer. Skills in Development, Coding, Testing and Debugging. Good Data analytic skills (Data Warehousing and BI). Also skills in Mainframe.