Another 'geezer' topic :-)

At 08:24 PM 5/13/1998 -0400, you wrote:
>What is a multiformat logical file?  I don't understand why the RRN isn't
>unique and therefore suitable...?  (I don't question you, I just don't
>understand it.  If its what I think it is, this must just one of many
>problems you have to overcome.)


Multis combine multiple physical files that contain similar keys (I think)
under one logical file. They are read in the key order. RRNs are
meaningless, since you're looking at many physicals, hence you can have the
same RRN for different records.

It's an AS/400 (IBM?) only technique, originating somewhere before true
logicals or something. I don't really know the history, just that they are
associated with S36 in my thinking.


Vernon Hamberg
Systems Software Programmer
Old Republic National Title Insurance Company
400 Second Avenue South
Minneapolis, MN  55401-2499
(612) 371-1111 x480

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