On Tue, 10 Jul 2018 14:23:34 -0400, Tony Thigpen wrote:
>
>Take a simple "I want to use a VSAM file". Here is what is normally used:
>z/OS:
>//POLYUPD  DD DSN=PROD.HKY.VSAM.HPP002P.F03,DISP=SHR
>z/VSE:
>// DLBL    TEITEST,'TEI.TEST.VSAM',,VSAM,CAT=VSESPUC
>
>z/OS (mostly) requires a DISP=. VSE (mostly) does not. VSE determines
>the correct setting at open time.
> 
How can it infer the difference between KEEP and DELETE?  (Or is that
the "mostly" part?)

-- gil

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