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Online Analytical Processing (OLAP)

Online Analytical Processing (OLAP). Anjali Gupta Mithun Arora Aameek Singh Kranthi Kumar. Introduction. OLAP designates a category of applications and technologies that allow the collection, storage, manipulation and reproduction of multidimensional data, with the goal of analysis.

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Online Analytical Processing (OLAP)

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  1. Online Analytical Processing (OLAP) Anjali Gupta Mithun Arora Aameek Singh Kranthi Kumar

  2. Introduction OLAP designates a category of applications and technologies that allow the collection, storage, manipulation and reproduction of multidimensional data, with the goal of analysis.

  3. RDBMS

  4. Table Extension…

  5. Why RDBMS fails … • 2-D Structure • Multiple Joins and Poor Performance • Denormalized Databases Drain Performance & Resources

  6. Enter OLAP !

  7. Consolidation • Pre-aggregation of all logical subtotals and totals • Pre-compute totals by each possible subset in the set of dimensions

  8. Basic Concepts • Dimensions • Measures • Positions • Hierarchies • Schemas - Star & Snowflake

  9. More Features… • Formulae Calculations on the fly • Drill Down & Roll Up Navigation through levels of detail • Slicing & Dicing • Pivot / Rotate Change Dimensional Orientation

  10. Different forms of OLAP Three ways of storing data: • Multidimensional OLAP (MOLAP) Best Query Performance • Relational OLAP (ROLAP) Ideal for large databases • Hybrid OLAP (HOLAP) Best of both worlds!

  11.  thank you 

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