How many DD names/files needs to be mentioned

Lavanya_Dhushetty · New User Joined: 30 Aug 2007 Posts: 24 Location: Chennai

Suppose program A calls program B program A uses 3 files and program B uses 2 files. While writing the JCL for executing program A, how many DD names/files needs to be mentioned?

a. 5 files
b. 2 files
c. 3 files
d. If a called program uses any file then a separate step needs to be written for that called module
e. None of the listed options.

sivatechdrive · Posted: Mon Sep 17, 2007 7:47 pm

hi,

5 files are needed with different DDnames
no seperate steps are needed for sub programs

in the jcl given run program(mainprogramname) plan(planname)

Cheers...
Prasad

dick scherrer · Posted: Mon Sep 17, 2007 7:48 pm

Hello,

Both modules use different files - the number of files/dd statements is 5. There would be 3 FDs in the first module and 2 FDs in the second.

Devzee · Posted: Tue Sep 18, 2007 2:43 am

The DD name may or may not be coded in JCL depends on what exactly the COBOL program is doing.
We can write Assembler program to read the files from COBOL program dynamically, in this case NO DD name statement is coded in the JCL.

Lavanya_Dhushetty · New User Joined: 30 Aug 2007 Posts: 24 Location: Chennai

Thanks a lot for da reply

dick scherrer · Posted: Wed Sep 19, 2007 8:29 pm

You're welcome

Sundar V · New User Joined: 25 Apr 2006 Posts: 5

Hi,

Suppose if i have 3 files which is being used in both programs A and B. Then will it be sufficient for me to keep 3 DD statement seperately in JCL and file declaration (FD) have to defined seperately in both the programs (A and B)?

Please advise my understanding is correct or not?

I taught of writing my doubt/question in seperate query/thread. And i found a discussion was already done about this topic. So i included my doubt with this.

Thanks for your support.

Douglas Wilder · Posted: Thu Jan 10, 2008 9:22 pm

Yes it is possible for the calling program and the called program to use the same 3 DDs. You may need to have the files closed in the calling program while the called program is running and vise versa. You could also declare the files to be external. It all depends on how you need to use the files. In many cases it is clearer to have 1 of the programs do all of the file access for files in common between calling and called programs.