Kinds of OLAP

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Online analytical processing (OLAP) is a category of software technology that enables analysts, managers, and executives to gain insight into data through fast, consistent, interactive access to a wide variety of possible views of information that has been transformed from raw data to reflect the real dimensionality of the enterprise as understood by the user.

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Page 1: Kinds of OLAP

Online analytical processing (OLAP) is a category of software technology that enables analysts, managers, and executives to gain insight into data through fast, consistent, interactive access to a wide variety of possible views of information that has been transformed from raw data to reflect the real dimensionality of the enterprise as understood by the user.

Page 2: Kinds of OLAP

Kinds of OLAP

ROLAP- relational OLAP using relational databases; a star schema is used

MOLAP- multidimensional OLAP using multidimensional databases

DOLAP- desktop OLAP Other variations

Page 3: Kinds of OLAP

Example: Olap Usage of an Automobile Marketer

The StoryAn automobile marketer wants to improve business activity. Therefore he wants to view sales figures from different perspectives.

A QuestionWhat is the trend in sales volumes over a period of time for a specific model and color across a specific group of dealerships ?

The Data NeedsSales by model

Sales by dealership

Sales by color

Sales over time

etc.

Page 4: Kinds of OLAP

Example: The Multidimensional View of the Data

Sales Volumes

Blue Red White

Van

Coupe

Sedan

Miller

Clyde

Smith

COLOR

DEALERSHIP

MOD E L

Page 5: Kinds of OLAP

OLAP Features: “Slicing and Dicing“ the Data

Sales Volumes

Blue

Red White

Van

Coupe

Sedan

Miller

Clyde

Smith

COLOR

DEALERSHIP

MOD E L

• Color: Blue and White• Model: Coupe only• Dealership: Clyde only

Clyde

Blue

White

Coupe

“Sliced and Diced“ Data

Choosing a range out of each dimension:

Page 6: Kinds of OLAP

OLAP Features: Rotating the Data

Sales Volumes

Blue Red White

Van

Coupe

Sedan

COLOR

MOD E L

View of the Account Manager

Rotate the data cube by 90°

DEALERSHIP

Sales Volumes

Miller

Smith

Clyde

Van

Coupe

Sedan

MOD E L

View of the Product Manager

Different users will require different views of the multidimensional cube – OLAP allows easy rotation of data

Page 7: Kinds of OLAP

OLAP Features: Drill-Down and Roll-Up

Data can be disaggregated and aggregated along a dimension according to their natural hierarchy

Drill-Down

Roll-Up

State

Region

Dealership Miller Smith

Clyde Lucas Gleason

Atlanta Athens

Georgia

Sales Volumes by Organization Dimension

- three level hierarchy -