Data Warehousing ETL
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Questions and Answers

What happens to existing data in the target table during the append process?

  • It is deleted if a duplicate is found
  • It is updated with the incoming data
  • It is preserved and the incoming data is added (correct)
  • It is replaced by the incoming data

    • What happens when an incoming record is a duplicate of an already existing record during the append process?

  • The incoming record is always rejected
  • The incoming record is merged with the existing record
  • The incoming record can be added as a duplicate or rejected (correct)
  • The incoming record always replaces the existing record

    • What is the primary action of the Destructive Merge process?

  • Updating existing records in the target table (correct)
  • Adding new records to the target table
  • Deleting existing records from the target table
  • Rejecting incoming duplicate records

    • What happens when the primary key of an incoming record matches with the key of an existing record during the Destructive Merge process?

    <p>The existing record is updated</p> Signup and view all the answers

    What is the primary difference between the Destructive Merge and the Constructive Merge processes?

    <p>How they update existing records</p> Signup and view all the answers

    What happens when the primary key of an incoming record matches with the key of an existing record during the Constructive Merge process?

    <p>The existing record is left unchanged, and the incoming record is added as a superseding record</p> Signup and view all the answers

    What happens to new records without a match with any existing record during the Destructive Merge process?

    <p>They are added to the target table</p> Signup and view all the answers

    What is the primary goal of the append process?

    <p>To add new records to the target table</p> Signup and view all the answers

    What is the result of the Constructive Merge process when the primary key of an incoming record matches with the key of an existing record?

    <p>The existing record is left unchanged, and the incoming record is added as a superseding record</p> Signup and view all the answers

    What is the key consideration when handling duplicates during the append process?

    <p>How to handle incoming duplicate records</p> Signup and view all the answers

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