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introduction to datawarehouse
- 1. Introduction to Data Warehousing BY G.KIRAN KUMAR HT.NO:001-09-06-002
- 3. Scenario 1 GK Pvt Ltd is a company with branches at Mumbai, Delhi, Chennai and Banglore. The Sales Manager wants quarterly sales report. Each branch has a separate operational system.
- 4. Scenario 1 : GK Pvt Ltd. Mumbai Delhi Chennai Banglore Sales Manager Sales per item type per branch for first quarter.
- 6. Solution 1:GK Pvt Ltd. Mumbai Delhi Chennai Banglore Data Warehouse Sales Manager Query & Analysis tools Report
- 7. Scenario 2 One Software company has huge operational database. Whenever Executives wants some report the OLTP system becomes slow and data entry operators have to wait for some time.
- 8. Scenario 2 : One Software Company Operational Database Data Entry Operator Data Entry Operator Management Wait Report
- 10. Solution 2 Operational database Data Warehouse Extract data Data Entry Operator Data Entry Operator Manager Report Transaction
- 11. Scenario 3 Cakes & Cookies is a small, new company. President of the company wants his company should grow. He needs information so that he can make correct decisions.
- 13. Solution 3 Query and Analysis tool President Expansion Improvement sales time Data Warehouse
- 14. What is Data Warehouse??
- 15. Inmons’s definition A data warehouse is -subject-oriented, -integrated, -time-variant, -nonvolatile collection of data in support of management’s decision making process.
- 24. Star Schema (contd..) Store Dimension Time Dimension Product Dimension Fact Table Benefits: Easy to understand, easy to define hierarchies, reduces no. of physical joins. Store Key Product Key Period Key Units Price Store Key Store Name City State Region Period Key Year Quarter Month Product Key Product Desc
- 26. SnowFlake Schema (contd..) Time Dimension Product Dimension Fact Table City Dimension Store Dimension Drawbacks: Time consuming joins,report generation slow Store Key Product Key Period Key Units Price Store Key Store Name City Key Period Key Year Quarter Month Product Key Product Desc City Key City State Region
- 28. Fact Constellation (contd..) Store Dimension Product Dimension Sales Fact Table Shipping Fact Table Store Key Product Key Period Key Units Price Store Key Store Name City State Region Product Key Product Desc Shipper Key Store Key Product Key Period Key Units Price
- 36. Thank You
Hinweis der Redaktion
- we invent something only if there is a need for that thing….today we are going to see what data warehousing is…data warehouse is evolved to satisfy some needs….we will see some of these need now
- We need subject oriented and multidimensional data amodel fro data warehouse which facilitates online analysis