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

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Presentation transcript:

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 MonthStyleQuantityTotal Value Jan 2000Ski Boot51,700 Jan 2000Gumboot30065,000

4 Table Extension… MonthStyleOutletQty.Total Value Jan 2000 Ski Boot HN31300 Jan 2000 Gum- Boots SS

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