jcl questions

karthik1680 · New User Joined: 14 May 2005 Posts: 64 Location: chennai

hi to all
this are the questions

in my program expanding the customer-code,country-code from 4digits to 6 digits.need some sample programs?

what is jcllib?( i know the ans i want it clearly)

what is jes2 & jes3?

what is proclib?

mmwife · Super Moderator Joined: 30 May 2003 Posts: 1592

JCLLIB is a JCL stmt that defines the proclib(s) and includelib(s) to be used in processing the JOB submitted.

JES2 & JES3 are Job Entry Subsystems. They control jobstream input and spooling functions and to some extent job scheduling and resource allocation.

JES2 provides those functions for systems running on a single "tightly coupled" mainframe.

JES3 provides those functions for systems running on a multiple "loosely coupled" mainframes or a combination of both.

"Loosely coupled" means that the mainframes communicate over high speed channels (they used to call them CTCs - channel to channel adapters); "tightly coupled" means the mainframes are directly connected under the covers.

Proclib contains cataloged procedures or PROCs. APROC is roughly analogous to a subpgm. They are "called" by JOB JCL and executed.

They exist for some of the same reasons that subpgms do. If you have JCL steps that may be executed in a variety of circumstances you can create a PROC of them and execute them from a variety of JOBS or multiple times in the same job.

karthik1680 · New User Joined: 14 May 2005 Posts: 64 Location: chennai

thanks for your answers.
reply for this questions this are interview questions
where does the jcllib resides?
in notify parameter if u specify more than two parameters what happen?