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BUC: Partitioning

  • Usually, entire data set can’t fit in main memory
  • Sort distinct values
    • partition into blocks that fit
  • Continue processing
  • Optimizations
    • Partitioning
      • External Sorting, Hashing, Counting Sort
    • Ordering dimensions to encourage pruning
      • Cardinality, Skew, Correlation
    • Collapsing duplicates
      • Can’t do holistic aggregates anymore!

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