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What is the primary reason to compute aggregates in advance?

  1. A Repeated expensive scans are replaced by cheap lookups for common queries
  2. B It reduces raw storage
  3. C It improves data quality
  4. D It simplifies the schema
Answer

Repeated expensive scans are replaced by cheap lookups for common queries

The trade-off is keeping aggregates consistent with the underlying data as it changes, including for late-arriving records.

All Big data MCQs

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