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The extract process is which of the following?

  • A.Capturing all of the data contained in various operational systems
  • B.Capturing a subset of the data contained in various operational systems
  • C.Capturing all of the data contained in various decision support systems
  • D.Capturing a subset of the data contained in various decision support systems

Answer: B

Correct answer: Capturing a subset of the data contained in various operational systems

Extraction takes only what the warehouse needs, since operational systems hold a great deal that has no analytical value. Restricting the extract also limits the load placed on the operational systems, which must continue running the business while the extract takes place.

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