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The Data Warehouse Toolkit - Third Edition
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Even with a robust transaction schema, there is a whole class of urgent business questions that can’t be answered using only transaction detail. It is difficult to derive claim-to-date performance measures by traversing through every detailed claim task transaction from the beginning of the claim’s history and appropriately applying the transactions.
On a periodic basis, perhaps at the close of each day, you can roll forward all the transactions to update an accumulating claim snapshot incrementally. The granularity is one row per claim; the row is created once when the claim is opened and then is updated throughout the life of a claim until it is finally closed.
Many of the dimensions are reusable, conformed dimensions, as illustrated in Figure 16-9. You should include more dates in this fact table to track the key claim milestones and deliver time lags. These lags may be the raw difference between two dates, or they may be calculated in a more...
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