What happen if we don't specify Joblib and Steplib in a job

Shrikanth · New User Joined: 26 Feb 2007 Posts: 5 Location: Bangalore

Hi All,

i have query, what happeneds if we don't specify joblib and steplib in a job, and what is the error message will pop up.? Can some body help me in this?

Appreicate your help!
Shrikanth

William Thompson · Posted: Tue Feb 27, 2007 11:52 pm

Possibly an error about not finding what the joblib should have been pointing to. The same goes for the steplib.
You do know what type of facility each points to, don't you?

superk · Posted: Wed Feb 28, 2007 12:24 am

Kind of a silly question. Normally JOBLIB and STEPLIB aren't used in production applications.

prav_06 · Posted: Wed Feb 28, 2007 12:38 pm

Srikanth,
If ya don't specify STEPLIB or JOBLIB , the system would start searching in the default libraries like sys1.linklib etc.., and if the system could not find the program u r trying to execute it would end up giving a System Abend 806, Load module not found.

SUPERk

superk · Posted: Thu Mar 01, 2007 2:21 am

Thamilzan, is there a particular business reason why the libraries are split that way, and why they're not defined to the LINKLIST?

prav_06 · Posted: Thu Mar 01, 2007 5:47 pm

Superk,
There is no specific business reason, I have my prod. load lib in all the jobs given in either steplib or joblib, now if i want to test a particular pgm for development purpose i will just override the JOBLIB or STEPLIB st. which is inside the PROC, and more than that , I had enquired about this senario to my peer's as well as friends who work on mainframes, they all have a steplib or joblib in their PRODUCTION jcl's and PROC's.

Thamilzan.

acevedo · Active User Joined: 11 May 2005 Posts: 344 Location: Spain

dick scherrer · Posted: Fri Mar 02, 2007 3:33 am

Hello,

At several of my larger sites, STEPLIBs are used. These sites are "service providers" and (to save on licensing fees and physical considerations) run a few very large machines instead of several mid-sized machines.

When one machine is running processes for multiple clients, it is common for each client to have their own loadlib(s) and proclib(s). Sometimes, the same module name appears in completely unlike applications. System software libraries are in the linklst.

Most of my sites either discourage or completely prevent the use of JOBLIBs - for performance. A few of the studies i worked on showed that three of the most often executed programs are IEFBR14, IEBGENER, and "the sort". Sometimes there are a few "local favorites" utilities as well. Given that these are usually NOT in any of the "user" loadlibs, there is no reason to search those libs which using JOBLIB would do.

jayaraj313 · New User Joined: 19 Sep 2006 Posts: 3

Hey Srinath!!!!!
If you are not specifying steplib&joblib then compiler will search in linklisi.That is sys1.linklib....

cobolunni · Posted: Tue Mar 06, 2007 11:59 pm

Yes actually steplib and joblib is used to override the default libraries

dick scherrer · Posted: Wed Mar 07, 2007 12:25 am

Hello,

The job/step lib statements do not override the default libraries (also known as the link list). They are searched before the linklst.

This is why when executing an IBM utility or some other linklst'ed module, it adds overhead to search libraries where they will never be.

cobolunni · Posted: Wed Mar 07, 2007 12:44 am

yes right but actually it is a type of overriding because jes will check the libraries specified before checking default library

dick scherrer · Posted: Wed Mar 07, 2007 12:57 am

Hello,

Sorry to disagree, but i do not believe it a type of overriding - overriding implies using one thing instead of another - the original is not used at all as in when we override a DD statement or a COND=. For JCL, i believe it is safe to say (someone will correct me if it is not

) that the term override is used in connection with PROCedures.

Joblib/steplib do not cause the linklib to not be searched. . .

Now, a steplib, in a proc, could have an override. . .

cobolunni · Posted: Wed Mar 07, 2007 1:12 am

dick scherrer · Posted: Wed Mar 07, 2007 2:48 am

Hello,

Joblib/Steplib determine library search order.

I believe there is a difference between the order of libraries searched and an override. As i mentioned earlier, you could override a steplib. . . .

If some folks would like to refer to that as an override, well, OK. Won't worry me.

cobolunni · Posted: Wed Mar 07, 2007 9:11 pm

yes nice , but you doesn't answer my question. From your point of view how the step lib becomes an override since thats also only makes difference in order of search

deepak.vl · New User Joined: 17 Feb 2007 Posts: 38 Location: Hyderabad

I agree with Dick..there is a difference the order of libraries searched and an override
With in JOBLIB/STEPLIB, JOBLIB 'OVERRIDES' STEPLIB. But with in JOBLIB/STEPLIB and other default libraries, it is the order of search.

dick scherrer · Posted: Wed Mar 07, 2007 11:30 pm

Hello cobolunni,

If you re-read what i posted, you will notice that i did not say

cobolunni · Posted: Thu Mar 08, 2007 11:19 pm

Ok dick thanks for your data

dick scherrer · Posted: Thu Mar 08, 2007 11:34 pm

You're welcome