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The star schema is an important special case of the snowflake schema, and is more effective for handling simpler queries. [2] The star schema gets its name from the physical model's [3] resemblance to a star shape with a fact table at its center and the dimension tables surrounding it representing the star's points.
Example of a star schema; the central table is the fact table. In data warehousing, a fact table consists of the measurements, metrics or facts of a business process. It is located at the center of a star schema or a snowflake schema surrounded by dimension tables. Where multiple fact tables are used, these are arranged as a fact constellation ...
It is a hybrid approach encompassing the best of breed between 3rd normal form (3NF) and star schema. The design is flexible, scalable, consistent and adaptable to the needs of the enterprise" [ 11 ] Data vault's philosophy is that all data is relevant data, even if it is not in line with established definitions and business rules.
The essential design pattern resembles a star schema. GESMES/TS promotes automation by its ability to explicitly declare the dimensions and allowable metadata fields in a standardised way. Software can then translate these declarations into a database schema suitable to hold the multi-dimensional data. This mechanism makes GESMES/TS versatile ...
A fact constellation schema, also referred to as a galaxy schema, is a model using multiple fact tables and multiple dimension tables. [1] These schemas are implemented for complex data warehouses. [1] The fact constellation is a measure of online analytical processing and can be seen as an extension of the star schema.
The reverse star schema is a schema optimized for fast retrieval of large quantities of descriptive data. The design was derived from a warehouse star schema , [ 1 ] and its adaptation for descriptive data required that certain key characteristics of the classic star schema be "reversed".
The snowflake schema is in the same family as the star schema logical model. In fact, the star schema is considered a special case of the snowflake schema. The snowflake schema provides some advantages over the star schema in certain situations, including: Some OLAP multidimensional database modeling tools are optimized for snowflake schemas. [3]
In 2010, Tim Berners-Lee suggested a 5-star scheme for grading the quality of open data on the web, for which the highest ranking is Linked Open Data: [10] 1 star: data is openly available in some format. 2 stars: data is available in a structured format, such as Microsoft Excel file format (.xls).