Re: Timestamps

["Bruce Jin" <brucej@xxxxxxxxxxxxxxxxxxxx>]

I must have missed a few threads.
How do I generate UUID?
Thanks
Bruce

-----Original Message-----
From: John Taylor <john.taylor@telusplanet.net>
To: RPG400-L@midrange.com <RPG400-L@midrange.com>
Date: Wednesday, November 22, 2000 11:25 AM
Subject: Re: Timestamps


>Chris,
>
>You'd never get duplicates in your test case because each machine has a
>different NIC, which would guarentee a unique NODE segment within the UUID.
>
>Regards,
>
>John Taylor
>Canada
>
>----- Original Message -----
>From: "Chris Bipes" <chris.bipes@cross-check.com>
>To: <RPG400-L@midrange.com>
>Sent: Wednesday, November 22, 2000 09:44
>Subject: RE: Timestamps
>
>
>> We have 3 AS400s, (720/170/400), and I ran a test, Create 1,000,000
>records
>> with two fields, UUID, (Universal Unique ID - 16A), and Time Stamp.  When
>> combining the three files, I had duplicate time stamps but not duplicate
>> UUIDs.  Can an 24 way 850, with a zillion disk arms, write more than one
>> record a nano second?  Perhaps the next generation will.
>>
>> Christopher K. Bipes mailto:ChrisB@Cross-Check.com
>> Sr. Programmer/Analyst mailto:Chris_Bipes@Yahoo.com
>> CrossCheck, Inc.    http://www.cross-check.com
>> 6119 State Farm Drive Phone: 707 586-0551 x 1102
>> Rohnert Park CA  94928 Fax: 707 586-1884
>>
>> If consistency is the hobgoblin of little minds, only geniuses work here.
>> Karen Herbelin - Readers Digest 3/2000
>>
>> -----Original Message-----
>> From: Eric N. Wilson [mailto:doulos1@home.com]
>> Sent: Wednesday, November 22, 2000 7:33 AM
>> To: RPG400-L
>> Subject: Re: Timestamps
>>
>>
>> Hello,
>>
>> Using the API is a bit of overkill in most situations. Doing the Time
>> opcode into a timestamp field gives you everything but the last 3
>> digits of the timestamp... Which I believe to be the same result as
>> the API.
>>
>> Using a logical file with the time stamp omitted is the only way I
>> know of to actually get the last three digits of the timestamp...
>>
>> Even if a person were able to get the last three digits of a timestamp
>> there will come a day when more than one record will be able to be
>> added in that interval (Trust me it will especially if you rely on a
>> timestamp to be your unique key). There has been discussion on the
>> validity of using timestamps and methods of retrieving them recently
>> and should be accessible via the search facilities.
>>
>> A approach that may be more viable is to use a UUID as has also been
>> discussed recently. The value is not pretty to the eyes, but unique
>> keys should not have any embedded meaning (other than to uniquely
>> identify a record) in my opinion.
>>
>> Wednesday, November 22, 2000, 12:43:38 AM, you wrote:
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