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Mainframe datasets without any last reference date

 
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rajatbagga

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Joined: 11 Mar 2007
Posts: 197
Location: india

PostPosted: Tue Sep 24, 2019 8:47 am    Post subject: Mainframe datasets without any last reference date
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Hello Everyone,

Is it right to say that Mainframe datasets without any Last Reference Date should always be empty?

Regards
Rajat
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steve-myers

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Joined: 30 Nov 2013
Posts: 796
Location: The Universe

PostPosted: Tue Sep 24, 2019 9:54 am    Post subject:
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Not necessarily. It's possible for an unauthorized program to open a data set without updating the reference date. Notice I said "possible." It's legal, does not require anything underhanded, but it's an Assembler "trick" that is not available to high level languages. I have one program that does it. This program is doing an open for input. I don't know what would happen with an open for output.

If I recall correctly it's documented, but finding it is not so easy. I recall putting out a query in one of these forums and someone told me about the trick maybe 15 years ago.
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