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The Data Warehouse Toolkit - Third Edition
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To this point, we have pretended dimensions are independent of time. Unfortunately, this is not the case in the real world. Although dimension table attributes are relatively static, they aren’t fixed forever; attribute values change, albeit rather slowly, over time. Dimensional designers must proactively work with the business’s data governance representatives to determine the appropriate change-handling strategy. You shouldn’t simply jump to the conclusion that the business doesn’t care about dimension changes just because they weren’t mentioned during the requirements gathering. Although IT may assume accurate change tracking is unnecessary, business users may assume the DW/BI system will allow them to see the impact of every attribute value change. It is obviously better to get on the same page sooner rather than later.
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