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Rob, I would be interested in that presentation if you are sharing ?


Don Brown




From: "Rob Berendt" <rob@xxxxxxxxx>
To: "Midrange Systems Technical Discussion" <midrange-l@xxxxxxxxxxxx>
Date: 05/01/2019 04:06 AM
Subject: Re: Handling Record Change Journal Entries
Sent by: "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxx>



With temporal tables you do add a few columns. And this can have
ramifications, depending on your application software (with record level
checks).

But, if the application software is done right you can add those columns
and not have an issue.
Let's take Infor LX for example. Some might say they are not a shining
example of good database definitions. No primary keys, constraints, etc.
However their LF's are done right. They list every column individually
and use a separate record format.
R IPR100CO PFILE(RCO )
CRSTS 1A TEXT('Record Status')
COLHDG('Rcd' +
'Sts' )
CRTYP 1A TEXT('Record Type')
COLHDG('Rcd' +
'Typ' )
CMPNY 2P 0 TEXT('Company Number')
COLHDG('Cmp' +
'Nbr' )
EDTCDE(X)
...

So I played with this RCO file and used ALTER TABLE to add a few columns
needed (or desired) for temporal table support. Then I did the rest of
the stuff needed for temporal table support. I was able to run their
software unchanged, no recompiles, without a single problem.

I have a presentation on this I can share offline.



Rob Berendt

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