What is extended star schema?

In an extended star schema, you have the fact and dimension tables inside the cube, however SID tables are outside the cube. These SID tables are also called as characteristics and each characteristic can have master data tables like ATTR, Text, etc. ATTR − It is used to store all the attribute data.

What is the difference between a star schema fact table and extended star schema?

The difference between both models is consisting of master data in dimension table in the Star Schema where the dimension table does not contain master data in the Extended Star Schema. The master data is reusable here as it is outside of the Infocube.

What is star schema SAP?

A classical star schema is a multidimensional data model.It is based on a central fact table surrounded by several dimension tables in the shape of a star (hence the name). An InfoCube consists of several Info-Objects (Characteristics and Key figures) and is structured according to the star schema.

What is the maximum number of tables that can be joined in a star schema in a single query?

Theoretically, there is no upper limit on the number of tables that can be joined using a SELECT statement. (One join condition always combines two tables!) However, the Database Engine has an implementation restriction: the maximum number of tables that can be joined in a SELECT statement is 64.

What is the difference between InfoCube and DSO?

The main difference between the DSO Object and the PSA and InfoCube is that the DSO Object allows existing data to be changed. Whereas an InfoCube principally allows inserts, and only allows deletion on the basis of requests, data in an DSO Object can be changed during the staging process.

What are dimension and fact tables?

Fact Table vs Dimension Table Comparison Table

Characteristics	Fact Table	Dimension Table
Creation Time	A fact table is created after dimension tables are created.	The dimension table needs to be created first.
Schema Structure	There is less number of fact tables in a schema.	There is a number of dimension tables in a schema.

What is info cube?

an InfoCube is a multidimensional data structure and a set of relational tables that contain InfoObjects. 2. INFOCUBE- STRUCTUREStructure of InfoCube is considered as ESS-Extended Star Schema/Snow Flake Schema, that contains. • 1 Fact Table. • n Dimension Tables.

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.

Is a star schema normalized or denormalized?

Normalization of dimension tables The snowflake schema is a fully normalized data structure. On the other hand, star schema dimensions are denormalized.

How many dimensions can a star schema have?

four dimensions
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.

What is LSA architecture?

The concept of layered scalable architecture (LSA) assists you in designing and implementing various layers in the BW system for data acquisition, Corporate Memory, data distribution and data analysis. These transformations create a Data Warehouse data model from data.

What is extended star schema in DBMS?

In extended star schema, “fact table” and “master data table” is connected through SID (Surrogate ID) table. In extended star schema , fact table and dimension table will be inside the cube. It has analyzing capacity of 16*248 (SID Table).

What is the size of the fact table in extended star schema?

In extended star schema , fact table and dimension table will be inside the cube. It has analyzing capacity of 16*248 (SID Table). Fact table is small and dimension table is huge contrary to Star Schema model.

Where are star schemas stored?

Schemas are generally stored in a data dictionary. What is Classical Star Schema? A classical star schema is a multidimensional data model.It is based on a central fact table surrounded by several dimension tables in the shape of a star (hence the name).

What is the difference between star schema and infocube?