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What is denormalisation in a big data context?

  1. A Duplicating data to avoid expensive joins at query time
  2. B Removing duplicate rows
  3. C Normalising into more tables
  4. D Compressing repeated values
Answer

Duplicating data to avoid expensive joins at query time

Storage is cheap relative to distributed join cost, so duplication is often the correct trade in analytical systems.

All Big data MCQs

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