CRIMEWATCH CONSULTING, INC.Presentation 3: Cube and DW Implementation

• Adwait Mulye• Yuga Pawar• Floyd J. Srubar• Vidyasagar Velamala

Brief Overview: A More Simplified Dimensional Model

Facts from Presentation 2 Were Too Complex○ They have been re-designed for use in a DW.○ Over 10,000 Records Were Found Having Inconsistencies

Responsible For Errors in SQL Server Analysis Services Incorrect FK entries Null values in FK fields They were deleted to save time and space.

Dimensions Have Been Altered Slightly○ A redefined scope for our DW

The Police Department organizational hierarchies were found to be beyond the scope of the original intent of the DW, and were replaced.

The focus of this DW will be “Neighborhood Crime Statistics”, and the various dimensions that relate to these facts, which should still provide adequate information to consumers of our DW. (Star Schema)

Brief OverviewBrief Discussion of the New Dimensional Model

○ View the Diagram○ Discuss Relevant Dimension Table Changes

Specific Applications of the Data Warehouse Information○ [Location] x [Offense Type] x [Time of Day]

AM

○ [Location] x [Date] x [Premises]VV

○ [Location] x [Date] x [Offense Type]YP

○ [Time of Day] x [Premises] x [Offense Type]FJS

REVISED DIMENSIONAL MODEL

A New Dimensional Model: [Star Schema]

Relevant Change Information

DimDateNow allows us to determine many useful

date measures in the DW reporting.○ Day of Week○ Day of Month○ Week of Month○ Week of Year○ Quarter of Year○ Weekend Days

Relevant Change Information DimTimeOfDay

Allows for determination of common times of day based on the ‘Hour’ field from the fact table.○ Overnight [12AM – 5AM]○ Mornings [5AM – 12PM]○ Afternoons [12PM – 5PM]○ Evenings [5PM – 12AM]

Relevant Change Information DimLocations (new Dimension)

Still refers to block ranges and streets, but offers more DW report generation flexibility.

Allows for measurement by the concatenated block range and street○ (e.g. 1200-1299 Bay Area)

Or…Entire Street with all block ranges○ (e.g. Bay Area, with “All” block ranges selected)

Or…Selected disjointed block ranges○ (e.g. 2600-2699 Bay Area [AND] 2800-2899 Bay

Area)

SPECIFIC DW APPLICATIONS

Rough View of The Cube!

[Location] x [Offense Type] x [Time Of Day]

Relationships that make this possible

[Location] x [Offense Type] x [Time Of Day]

And now…In SQL Server Analysis Services!

[Location] x [Date] x [Premises]

Relationships that make this possible

[Location] x [Date] x [Premises]

And now…In SQL Server Analysis Services!

[Location] x [Date] x [Offense Type] Relationships that make this possible

[Location] x [Date] x [Offense Type] And now…In SQL Server Analysis

Services!

[Time of Day] x [Premises] x [Offense Type]

Relationships that make this possible

[Time of Day] x [Premises] x [Offense Type]

And now…In SQL Server Analysis Services!