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Typical OLAP Operations

  • Roll up (drill-up): summarize data
    • by climbing up hierarchy or by dimension reduction
  • Drill down (roll down): reverse of roll-up
    • from higher level summary to lower level summary or detailed data, or introducing new dimensions
  • Slice and dice: project and select
  • Pivot (rotate):
    • reorient the cube, visualization, 3D to series of 2D planes
  • Other operations
    • drill across: involving (across) more than one fact table
    • drill through: through the bottom level of the cube to its back-end relational tables (using SQL)

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