What is the use of star schema in SAP BW?
What is the use of star schema in SAP BW?
In Star Schema, each dimension is joined to one single fact table. Each dimension is represented by only one dimension and it is not further normalized. A dimension Table contains a set of attributes that are used to analyze the data.
What is difference between star schema and extended star schema?
In Classic star schema, dimension and master data table are same. But in Extend star schema, dimension and master data table are different. In Classic star schema we can analyze only 16 angles (perspectives) whereas in extended star schema we can analyze in 16*248 angles. Plus the performance is faster to that extent.
What is star schema data model?
A star schema is a database organizational structure optimized for use in a data warehouse or business intelligence that uses a single large fact table to store transactional or measured data, and one or more smaller dimensional tables that store attributes about the data.
What is the major difference between star schema and snowflake schema?
Star Schema Vs Snowflake Schema: Key Differences
| Star Schema | Snowflake Schema |
|---|---|
| In a star schema, only single join creates the relationship between the fact table and any dimension tables. | A snowflake schema requires many joins to fetch the data. |
| Simple DB Design. | Very Complex DB Design. |
What is Hana optimized InfoCube?
The SAP HANA-optimized InfoCube is a standard InfoCube that is optimized for use with SAP HANA. When you create SAP HANA-optimized InfoCubes, you can assign characteristics and key figures to dimensions. The system does not create any dimension tables apart from the package dimension however.
What is star schema example?
Model. The star schema separates business process data into facts, which hold the measurable, quantitative data about a business, and dimensions which are descriptive attributes related to fact data. Examples of fact data include sales price, sale quantity, and time, distance, speed and weight measurements.
How many dimensions should a star schema have?
A star schema for AllElectronics sales is shown in Figure 4.6. Sales are considered along four dimensions: time, item, branch, and location. The schema contains a central fact table for sales that contains keys to each of the four dimensions, along with two measures: dollars_sold and units_sold.
Is a star schema normalized or denormalized?
Star schema dimension tables are not normalized, snowflake schemas dimension tables are normalized. Snowflake schemas will use less space to store dimension tables but are more complex.
What is dim and fact table?
Dimension table Dimension table is a table which contain attributes of measurements stored in fact tables. This table consists of hierarchies, categories and logic that can be used to traverse in nodes. Fact table contains the measurement of business processes, and it contains foreign keys for the dimension tables.
