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niks_jude
Warnings : 1
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Joined: 01 Dec 2006
Posts: 144
Location: Mumbai
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| How is OPEN I-O possible on empty VSAM file as we have to read once before writing in I-O mode and as we know we cannot do a read on an empty VSAM file. |
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expat
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Joined: 14 Mar 2007
Posts: 8797
Location: Welsh Wales
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Then you have answered your own question.
This has been discussed before, open in write mode, write dummy record, close, open I-O mode delete dummy record. The file is then initialised.
Why, oh why, most sites do not impose a key '00'X header and key 'FF'X trailer rule when a file is set up I will never know. |
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niks_jude
Warnings : 1
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Joined: 01 Dec 2006
Posts: 144
Location: Mumbai
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Hi Expat,
I just read that you can open an empty VSAM file in I-O mode, when the access mentioned is random or dynamic. If we do a READ in I-O mode, would not it fail? |
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dick scherrer
Moderator Emeritus
Joined: 23 Nov 2006
Posts: 19244
Location: Inside the Matrix
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Hello,
Have you coded as Expat suggested?
| Quote: |
| open in write mode, write dummy record, close, open I-O mode delete dummy record. The file is then initialised. |
Did it work?
Did you try to issue a read without writing the "dummy record"? What happened? |
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superk
Global Moderator
Joined: 26 Apr 2004
Posts: 4652
Location: Raleigh, NC, USA
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| expat wrote: |
| Why, oh why, most sites do not impose a key '00'X header and key 'FF'X trailer rule when a file is set up I will never know. |
Every site I've ever worked at did/does. |
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