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Well, in our situation it is not considered bad, but auditors don't like it
and we always have to explain why that specific contractnumber or
invoicenumber is missing. So, if I could get rid of that, it would be nice.

Regards,
-Arco

Op maandag 8 mei 2017 heeft Rob Berendt <rob@xxxxxxxxx> het volgende
geschreven:

Why is it considered extremely bad to have missing sequence numbers? I
don't go around auditing our order header file for a gap in sequence
numbers.

I promise that I am not asking this question to say your fascination is
wrong. I just wonder why.


Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com





From: Arco Simonse <arco400@xxxxxxxxx <javascript:;>>
To: "RPG programming on the IBM i (AS/400 and iSeries)"
<rpg400-l@xxxxxxxxxxxx <javascript:;>>
Date: 05/06/2017 05:18 AM
Subject: Re: Trigger pgm to increment seq# in file
Sent by: "RPG400-L" <rpg400-l-bounces@xxxxxxxxxxxx <javascript:;>>



Hi Dieter,

Years ago when we implemented identity columns I have played with that.
Trying for example to do an ALTER TABLE xyz ALTER COLUMN abc RESTART WITH
thelostvalue. Or saving thelostvalue to another table and let the next
insert uae that with an OVERRIDING SYSTEM VALUE. But I ran in too much
issues (like locking issues) that I cannot remember exactly anymore, and
in
the end decided that it was not worth the effort for us.

Best regards,
-Arco

Op zaterdag 6 mei 2017 heeft D*B <dieter.bender@xxxxxxxxxxxx
<javascript:;>> het volgende
geschreven:

<Arco>
There is one caveat I don't like about them: when a transaction is
rolled
back before completion, you'll lose the number that was used for the
identity in that transaction.
</Arco>

Auto increment implementation is not under transaction controll of your
program. To solve this, you would need your own implementation (as a
trigger or SQL function). Including the generated numbers in the
inserting
transaction has the drawback that insert operations are serialized
limitting scalability.

D*B

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