What is a dimension in a database?
A database dimension is a collection of related objects, called attributes, which can be used to provide information about fact data in one or more cubes. An instance of a database dimension in a cube is called a cube dimension and relates to one or more measure groups in the cube.
What is dimension and its types?
Dimension: A dimension table has two types of columns, primary keys and descriptive data. For example, Time and Customer.
What type of dimensions are there?
The world as we know it has three dimensions of space—length, width and depth—and one dimension of time.
What are the 2 kinds of dimensions?
Top 9 Types of Dimension
- Conformed Dimensions. A dimension is considered a conformed dimension and is found in many places.
- Role Playing Dimensions.
- Shrunken Dimensions.
- Static Dimensions.
- Degenerate Dimensions.
- Rapidly Changing Dimensions.
- Junk Dimensions.
- Inferred Dimensions.
How many dimensions are there in data warehouse?
Types of Dimensions are Conformed, Outrigger, Shrunken, Role-playing, Dimension to Dimension Table, Junk, Degenerate, Swappable and Step Dimensions. Five steps of Dimensional modeling are 1.
What do we mean by dimensions?
1 : the length, width, height, or depth of something : a measurement in one direction (such as the distance from the ceiling to the floor in a room) She carefully measured each dimension of the room. The room’s dimensions [=its length, width, and height] were surprisingly small.
What are the different types of dimensions in data warehouse?
Types of Dimensions in Data Warehouse. Following are the Types of Dimensions in Data Warehouse: Conformed Dimension; Outrigger Dimension; Shrunken Dimension; Role-playing Dimension; Dimension to Dimension Table; Junk Dimension; Degenerate Dimension; Swappable Dimension; Step Dimension
What is a fact in data warehousing?
A fact in data warehousing describes quantitative transactional data like measurements, metrics, or the values ready for analysis. These include header numbers, order numbers, ticket numbers, transaction numbers, transaction currency, etc. The amount sold is a fact measure or a key performance indicator (KPI).
What is an dimdimension table?
Dimension tables contain the details about the facts. That, as an example, enables the business analysts to understand the data and their reports better. The dimension tables include descriptive data about the numerical values in the fact table. That is, they contain the attributes of the facts.
How to maintain mini dimension tables for historical data in SCD?
The solution is to maintain mini dimension tables for historical data like type 4 Dimension in SCD. The main table should contain the current values and mini dimensions can contains historical data. 3) Junk Dimensions: In the data warehouse design we will come across a situation to use flag values.