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Book Overview & Buying
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Table Of Contents
The Data Warehouse Toolkit - Third Edition
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In the meantime, we’ll discuss several complementary inventory models. The first is the inventory periodic snapshot where product inventory levels are measured at regular intervals and placed as separate rows in a fact table. These periodic snapshot rows appear over time as a series of data layers in the dimensional model, much like geologic layers represent the accumulation of sediment over long periods of time. We’ll then discuss a second inventory model where every transaction that impacts inventory levels as products move through the warehouse is recorded. Finally, in the third model, we’ll describe the inventory accumulating snapshot where a fact table row is inserted for each product delivery and then the row is updated as the product moves through the warehouse. Each model tells a different story. For some analytic requirements, two or even all three models may be appropriate simultaneously.
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