It's been working since the '70s
"Shmuel Metz (Seymour J.)" <[EMAIL PROTECTED]>
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02/23/2006 08:51 AM
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Re: IBM Supported method to empty PDS in Batch
In
<[EMAIL PROTECTED]>,
on 02/22/2006
at 12:53 PM, Richard Tsujimoto
<[EMAIL PROTECTED]> said:
>I don't recall if IBM explicitly states that you cannot/should not
>mess with the PDS directory records, although common sense may
>dictate otherwise. But, when I was a newbie MVS sysprog in the
>early 70's, it was more like the wild west. We had fiche, so we had
>the info to muck with the code. One tool we used was a simple
>program that emptied a PDS. We wanted to maintain the order and
>space allocation of various SYS1 data sets. The program basically
>rewrites the first PDS directory record, so that it had the same
>info as a newly created, but empty one. The program still works
>today, so the cache of being supported by IBM is not that
>important.
The directory structure is well documented, and emptying it out is a
piece of cake IF YOU KNOW WHAT YOU ARE DOING. Writing such code based
on guesses is an invitation to disaster.
--
Shmuel (Seymour J.) Metz, SysProg and JOAT
ISO position; see <http://patriot.net/~shmuel/resume/brief.html>
We don't care. We don't have to care, we're Congress.
(S877: The Shut up and Eat Your spam act of 2003)
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