Question: There are many applications in my company that are being retired and the data will be archived. What might be the role and scope of ETL in this kind of major archival of large amounts and variety of data?
Chuck Kelley's Answer: The row of the ETL would be to extract all the data and place it into flat files (along with any metadata about structure, meanings, valid values, etc.) so that it can be used, if needed, at another time. I, for one, do not believe that the data warehouse is the structure for holding archival, though I have heard it described that way. We need to build an archival process for all required systems. This is not just taking a backup of the database and retaining it for life, it is putting in real processes to be able to load the data into whatever current format we need to.
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