If DISP=SHR (that is if not DISP is provided), then the JCL Default of 
(NEW,PASS) would happen and the job would fail

> -----Original Message-----
> From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU]
> On Behalf Of Tony Thigpen
> Sent: Tuesday, July 10, 2018 2:43 PM
> To: IBM-MAIN@LISTSERV.UA.EDU
> Subject: Re: z/OS JCl vs. VSE JCL: VSAM files
> 
> Then, why does every VSAM DD for every z/OS site I have worked with,
> always include DISP=SHR?
> (I guess, because it's a habit from non-VSAM files and nobody told them they
> did not have to do it.)
> 
> Tony Thigpen
> 
> John Clifford wrote on 07/10/2018 04:16 PM:
> > Z/os VSAM is always accessed as  DISP=SHR.
> 
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