1. Design and ETL

2. Loading a Star Dimension table 다음에 fact table 데이터 로딩
필요에 따라서 referential integrity를 만족하도록 dimension, fact table에 동시에 로딩도 가능
Dimension table 간에는 dependency가 거의 없음

3. Load a Dimension Table Incremental process
Necessary to inspect the data sources of dimension tables for new and changed information on a regular basis
What a dimension load must achieve

4. Load a Dimension Table

5. Load a Dimension Table Preparing records for processing
Row-wise processing
Source
data
pivoted, transposed

6. Load a Dimension Table

7. Load a Dimension Table (Type 1 change)

8. Load a Dimension Table (Type 1 change)
brand_name (Type 1 attribute)
not fully dependent on the natural key
sku -> brand_code (type 2) ->(weakly determine) brand_name (type 1)

9. Load a Dimension Table (Type 2 change)
Cook, Dan
insertion

10. Loading the Fact Table
What a fact table load must achieve

11. Loading the Fact Table
Restructuring
A single record

12. Loading the Fact Table Aggregation
If the source data is given at a finer grain than is required by the fact table, => aggregation !
NK 기준, 해당하는 record를 병합, 요약 작업

13. Loading the Fact Table Identification of surrogate keys
Source 데이터 레코드는 Natural Key를 가지고 추출
추출한 레코드가 fact table에 들어갈 때는 Surrogate Key가 필요

14. Optimizing the Load Eliminating lookup Caching lookup
Dimension table에 대하여 Type 1 change 검사를 굳이 하지 않음
Caching lookup
Dimension table 전체 또는 필요 컬럼들을 memory에 로드

15. Optimizing the Load

16. Cleansing the Data
Cleansing the dimensional data
표준 코드

17. Cleansing the Data
Facts with invalid details

18. Housekeeping Columns
Housekeeping columns for ETL process

19. Housekeeping Columns

20. How to Design and Document a Dimensional Model

22. Dimensional Modeling Kimball’s guideline
Each star corresponds to a discrete process

23. Dimensional Modeling
may be grouped into a fact table !

24. Dimensional Modeling

25. Dimensional Modeling

26. Dimensional Modeling

27. Dimensional Modeling

28. Dimensional Modeling

29. Dimensional Modeling

30. Dimensional Modeling (detailed)

31. Dimensional Modeling (detailed)

32. Dimensional Modeling (detailed)

33. Dimensional Modeling (detailed)