W dniu 2016-01-29 o 19:17, Skip Robinson pisze:
We ran an inherited ISAM application in the 80s, a true dog. Then we learned
of a VSAM conversion aid that was at the time built in to whatever then
passed for DFSMS. It was magical. Simply convert files from ISAM to VSAM and
point the application to them. The system automatically transformed all ISAM
I/O operations to VSAM and returned data to the application as it expected.
Absolutely no changes to the application. The result was breath taking.
I'd be curious to know if that conversion aid is still delivered with z/OS.
It's called IIP - ISAM Interface Program.
It is designed to use VSAM datasets with ISAM applications. Another
reason to not understand people who insisted to use ISAM (which was the
case even after 2000).
BTW: Similar example (in human behavior) could be TSO segment. Some
people still use SYS1.UADS for that, while migration can be done with
one command, IBM-prepared REXX script. I believe there are no advantages
of using UADS, despite it is still supported.
--
Radoslaw Skorupka
Lodz, Poland
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