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  3. July 2006

Re: Concatenation of files

Alan,
I don't think one can create a logical over a logical. Leastwise, I've never seen such a thing.
You can create a logical over multiple physicals by simply defining multiple PFILE(x/x) statements in your DDS. I've done this several times with history labels such as you describe (Header and Detail). But it was always one logical over the header tables; a separate logical over the Details. Never tried to combine them into a multi-file join, but using this as a starting place you might try it to see how/if it works.
You, also, have the same "problem" that I have. That is, the PF's are in multiple libraries. My rule is: The logicals go into the same library as the physical. In this scenario this won't work and the libraries have to be specified in the PFILE( ) statement rather than relying upon the library list to keep things straight. 


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Alan Shore wrote:


Hi everybody. I have a question concerning the concatenation of data from
multiple files, but from different libraries.

I have 4 pair of files, each pair consists of a HDR and a DTL file, with a
one to many correlation, for example:-
LIBRARY1/HDRA & LIBRARY1/DTLA
LIBRARY2/HDRB & LIBRARY2/DTLB
LIBRARY3/HDRC & LIBRARY3/DTLC
LIBRARY4/HDRD & LIBRARY4/DTLD

A join logical can be built over each of these files, for example
LIBRARY1/HDRADTLA
LIBRARY2/HDRBDTLB
LIBRARY3/HDRCDTLC
LIBRARY4/HDRDDTLD
each of these HDR files has the same DDS layout as the other HDR files
each of these DTL files has the same DDS layout as the other DTL files
each of the join logicals has the same DDS layout as the other join logical
files

My question is:-
is there a way to create ONE logical from these four join logical files?

Thanks in advance

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