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Hello Jeff,
Am 12.05.2021 um 16:30 schrieb Jeff Crosby <jlcrosby@xxxxxxxxxxxxxxxx>:
If I do a Chain to this file and there are multiple matching records, will
I _always_ get the same record? Like (maybe) the one with the lowest RRN?
Or might it be different from 1 Chain to the next?
As far as I've observed, you'll get always the same record, as long as the physical (RRN) order within the given (second) key field value isn't changed. This can happen with REUSEDLT(*YES) plus frequent deletes/writes, or even a simple RGZPFM to reclaim unused space.
A while ago, I've coded a small load-paged subfile application (viewing call data records from my Asterisk PBX, being fed into the PF via ODBC) with a view-detail screen, relying solely on RRNs. I've created the PF with SQL, so I can't do a CHGPFM REUSEDLT(*NO). But since I won't delete records there, this is not an issue.
:wq! PoC
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