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CHAPTER 12: DATA EXTRACTION, TRANSFORMAT... > Fact Tables: History and Incremental...

Fact Tables: History and Incremental Loads

The key of the fact table is the concatenation of the keys of the dimension tables. Therefore, for this reason, dimension records are loaded first. Then, before loading each fact table record, you have to create the concatenated key for the fact table record from the keys of the corresponding dimension records.

Here are some tips for history loads of the fact tables:

  • Identify historical data useful and interesting for the data warehouse.
  • Define and refine extract business rules.
  • Capture audit statistics to tie back to the operational systems.
  • Perform fact table surrogate key look-up.
  • Improve fact table content.
  • Restructure the data.
  • Prepare the load files.

Given below are a few useful remarks about incremental loads for fact tables:


  

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