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You could create a db trigger over the transaction file. Have the trigger program write event date, time, event type (Insert, Delete, or Update) and the before and after record image. Given the number of transactions you may want to delete records as they are processed and reuse deleted records.
-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Gad Miron
Sent: Tuesday, May 01, 2012 2:59 AM
To: midrange-l@xxxxxxxxxxxx
Subject: Unique ID
Hello guys
Need some help with uniquely identifying records in data files that are
routinely extracted
to an external (SQL Server) data warehouse.
Only new or updated records are extracted and I need a way to tell which
record is new
(and add it to the DW) and which is existing updated record (in which case
update the existing record in the DW)
The transaction files are about 80 - 100 million records (all in all)
Since I could NOT find a field combination that uniquely identify each
records
I tries RRN but apparently some records gets deleted and it is no good.
Any help will be greatly appreciated
Gad
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