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On Tue, Dec 13, 2016 at 8:54 AM, Dan <dan27649@xxxxxxxxx> wrote:
Doable, but a maintenance
nightmare.
Not really, no.
The idea is that the LFs will never change. And once you build the first
field list, it's a simple matter to copy and past to the other logicals.
If at some point you add a new field that a program needs, then you create
a new logical, with an explicit field list that includes that new field and
change the program to use the new logical.
As long as the new logical has the same key as an existing, there's no
extra overhead beyond a few bytes of DASD for the object definition.
The concept's been around a while, programs only access data via logical
file with an explicit and unchanging format.
But the DB2 modernization whitepaper/redbook outlines the technique as a
method to move from DDS
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