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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?
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
Fact table size
Need for aggregates
Aggregating fact table
Three way

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Aggregate fact tables

  • 1.
  • 2. 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?
  • 3. 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
  • 4.
  • 5.
  • 6.
  • 8.
  • 10.
  • 12.
  • 13.