Aggregate fact tables

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Aggregate fact tables

  1. 1. Aggregates are precalculated summaries derived from the most granular fact table(level of detail in the fact table). If the fact table is at the lowest grain The facts or metrics are at the lowest possible level at which they could be captured from the operational system. what is the Advantages of lowest grain?
  2. 2. Choose a simple STAR schema with the fact table at the lowest possible level of granularity. Assume four dimension table with most granular fact table. Operational system-single order, invoice, product and so on. Data warehouse- produce large result set(these retrieve hundreds and thousands
  3. 3. Fact table size
  4. 4. Need for aggregates
  5. 5. Aggregating fact table
  6. 6. Three way

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