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General Heuristics (Agarwal et al. VLDB’96)

  • Sorting, hashing, and grouping operations are applied to the dimension attributes in order to reorder and cluster related tuples
  • Aggregates may be computed from previously computed aggregates, rather than from the base fact table
    • Smallest-child: computing a cuboid from the smallest, previously computed cuboid
    • Cache-results: caching results of a cuboid from which other cuboids are computed to reduce disk I/Os
    • Amortize-scans: computing as many as possible cuboids at the same time to amortize disk reads
    • Share-sorts: sharing sorting costs cross multiple cuboids when sort-based method is used
    • Share-partitions: sharing the partitioning cost across multiple cuboids when hash-based algorithms are used

Speaker notes:

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