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Updating fact tables while loading the data warehouse

While loading data in the data warehouse on a regular basis, can we update fact tables?

Technically? Sure. Architecturally, it is recommended the update be limited to setting the "state" of the record...

being updated to a "not current" state and insert the new record with the updated values. Using this approach provides much better auditability and the capability to reconstruct the results prior to the posting of "updates" as well as construct results for the now current and up-to-date information.

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This was last published in March 2002

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