Editor’s Note: DMReview.com is proud to introduce a new columnist to its online columnist lineup. Ron Forino has been in the industry for more than 20 years as a programmer, analyst, architect, project manager and director. Currently, Forino is a director of business intelligence/CRM for DMR Consulting where he has developed a series of data quality service offerings. Each month he will offer his insight into the latest data quality issues in his column "Data e.Quality."

Len, a new programmer recently trained in the use of a leading extract-transform-load (ETL) tool sat in front of his PC gazing off into the distance. His thoughts were of the training he took the previous month and of the unexplained error messages now on his screen, "When the instructor took us through this part of the course, we never had a problem. I don’t know what to make of it. Let me check my code one more time. No, that look’s OK. How about the input file layout? No, that’s OK. How about the target database schema? No, that’s OK too. What can be causing this error?"

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