IBM Natural Question:

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How to create 1 DDM that fetches 3 ADABAS files simultaneously?

IBM Natural Interview Question
IBM Natural Interview Question

Answers:

Answer #1
In general the DDM is part of a single Adabas file and we
the programmers play around the views of DDMs.

It is possible that there can be multiple views of a same
file, but I never heard that there can be one DDM from
multiple files.

Answer #2
You can create logical user view for the three DDM using SQL program to determine the selection conditions Then you can read the DDM of this logical view instead of reading the three files in the program.

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