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Extracting From DB2

Extracting From DB2

Extracting From DB2

Currently, most of our operational systems are os390 vsam.  Our data extract strategy is based around an end-of-day process which includes a nightly tape backup of operational files.  The data warehouse sources are those point-in-time snapshots of operational data on tapes.  EOD reporting also uses this point-in-time reporting stategy.

My question: We are migrating to DB2.  My understanding is that the database backups are some proprietary flat file format used in a DB2 restore function and are not useable as an extract source.  Is it common in a database operational environment to take "reporting" snapshots?  If so, are they a set of replicated tables?  If not, how do you deal with the issues of out-of-sync data sources because there is no common extact time?

RE: Extracting From DB2

I suggest you ignore the backups and simply extract the tables you want - this is what we did.

Yes, it is common to take snapshots - this reduces the impact of producing reports directly from your operational data and gives you a consistent repeatable point of reference.

The out-of-sync problem will have to be resolved by taking copies at the same time

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