Re: time/date as key fields -- MIDRANGE-L

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Crispin,

its definitly not unique. the documentation is not really clear, it says most likely unique. I've tried to adress this in as400.misc, but didn't get exact response there too. So I did test it on my own and I've got duplicate values on a fast multi processor iron in a massive parallel scenario.

Dieter

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From: "Crispin Bates" <cbates@xxxxxxxxxxx>
Sent: Friday, November 19, 2010 4:19 PM
To: "Midrange Systems Technical Discussion" <midrange-l@xxxxxxxxxxxx>
Subject: Re: time/date as key fields

Dieter,

Do you have any reference that says that a UUID from _GENUUID is not unique?

http://publib.boulder.ibm.com/infocenter/iseries/v6r1m0/index.jsp?topic=/rzatk/GENUUID.htm
says it is.

Are you saying it is not?

Thanks,

Crispin.

----- Original Message ----- From: <dieter.bender@xxxxxxxxxxxx>
To: "Midrange Systems Technical Discussion" <midrange-l@xxxxxxxxxxxx>
Sent: Friday, November 19, 2010 9:07 AM
Subject: Re: time/date as key fields

... it depends, maybe for referential constraints, if there are database
relations.
BTW: genUUID on AS/400 is only most likely unique!!! Best choice would be
an
identity column, if uniqueness is needed.

D*B

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