Whats a datawarehouse

What is a Data Warehouse? And Why Are So Many Schools Setting Them Up? Richard Goerwitz

What Is a Data Warehouse? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Why Are Schools Setting Up Data Warehouses? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Talking The Talk ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

OLTP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Transactional Systems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Simple Transactional Database ,[object Object],[object Object],[object Object],[object Object],[object Object]

More Complex Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The “Reporting Problem” ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Workarounds ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

ODS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

OLAP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

OLAP Support Databases ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

ETL Processes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Where Does the Data Go? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

So What Are Star Schemas? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

A Very Simple Star Schema ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

A More Complex Star Schema ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Oops, answers should have been placed in their own dimension (creating a “factless fact table”). I’ll demo a better version of this star later!

Data Marts ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Simple Data Mart Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Note conformed date, time dimensions!

CIRP Star/Data Mart ,[object Object],[object Object],[object Object],[object Object]

ROLAP, MOLAP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Data Cubes

Metadata ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The Data Warehouse ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

A Data Warehouse is Not… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Kimball & Caserta’s Definition ,[object Object],[object Object],[object Object],[object Object],[object Object]

Example Data Warehouse (1) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example Data Warehouse (2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

So Where is Colorado College? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Implementing a Data Warehouse ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Is This Really a Good Plan? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Isn’t a DW a Huge Undertaking? ,[object Object],[object Object],[object Object],[object Object],[object Object]

What Takes Up the Most Time? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Acc. to Kimball & Caserta, ETL will eat up 70% of the time. Other analysts give estimates ranging from 50% to 80%. The most often underestimated part of the warehouse project!

Eight Month Initial Deployment Step Duration Secure, configure network 1 day Deploy physical “target” DB 4 days Learn/deploy ETL tool 28 days Choose/set up modeling tool 21 days Design initial data mart 7 days Design ETL processes 28 days Hook up OLAP tools 7 days Publicize, train, train 21 days Step Duration Begin educating decision makers 21 days Collect requirements 14 days Decide general DW design 7 days Determine budget 3 days Identify project roles 1 day Eval/choose ETL tool 21 days Eval/choose physical DB 14 days Spec/order, configure server 20 days

Conclusion ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Whats a datawarehouse

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