What is a dimension in data?

In data warehousing, a dimension is a collection of reference information about a measurable event. In this context, events are known as “facts.” Dimensions categorize and describe data warehouse facts and measures in ways that support meaningful answers to business questions.

What is dimension in data warehouse with example?

In data warehousing, a dimension table is one of the set of companion tables to a fact table. The fact table contains business facts (or measures), and foreign keys which refer to candidate keys (normally primary keys) in the dimension tables.

What are the types of dimensions in data warehouse?

In data warehousing there are 6 types of dimension:

  • Normal dimension.
  • Junk dimension.
  • Split dimension.
  • Text dimension.
  • Stacked dimension.
  • Distinct Attribute dimension.

How many dimensions are there in data warehouse?

There are many dimension types. Below, we will see just four of them: conformed dimensions, role-playing dimensions, slowly changing dimensions, and junk dimensions. For more information on dimension types, take a look at the most common types of dimensions in data warehousing.

What is a dimensional dataset?

Dimensionality in statistics refers to how many attributes a dataset has. For example, healthcare data is notorious for having vast amounts of variables (e.g. blood pressure, weight, cholesterol level). In an ideal world, this data could be represented in a spreadsheet, with one column representing each dimension.

What type of data is stored in dimension tables?

Dimension table store descriptive information about the numerical values in a fact table. For example, dimension tables for a marketing analysis application might include Time Period, Marketing Region, and Product Type. Dimension tables describe the different aspects of a business process.

What is a dimensional database?

A dimensional database is a relational database that uses a dimensional data model to organize data. This model uses fact tables and dimension tables in a star or snowflake schema. A dimensional database is the optimal type of database for data warehousing.

What are high dimensional data?

High dimensional data refers to a dataset in which the number of features p is larger than the number of observations N, often written as p >> N.

What are the 5 types 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.

What is a dimension table in a database?

A dimension table is a table in a star schema of a data warehouse. A dimension table stores attributes, or dimensions, that describe the objects in a fact table. In data warehousing, a dimension is a collection of reference information about a measurable event.