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What is a slowly changing dimension?

Please explain what a slowly changing dimension is and how it is used!
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rhservan
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rhservan
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ValentinoVBI ConsultantCommented:
There are several different types of SCD, I assume you're referring to a slowly changing dimension of type 2? (the most common one)

The easiest explanation would be: it's a dimension with a history.  Imagine a Product dimension with one of the attributes being ProductName.  If you want to track changes to ProductName, you can make this a SCD of type 2.  That way you know that up until a certain data, "Product X" was called "Product X" and from that date on it was renamed to "Product X2", but in essence it is actually still "Product X".  The business key for the product would remain unchanged (important!!) and that's how you'd link the two records.

More info: [Wikipedia]: Slowly changing dimension
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