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Star schema is one of the simplest schemas in a data warehouse. A star schema has each of the dimensions represented in a single table. There are no hierarchies present between the dimensions Consists of a single fact table surrounded by dimension tables. Mar 11, 2011 · On the performance side, a star schema has a strict relationship between facts and dimensions that many databases take advantage of in the form of a 'star join'. When you introduce snowflakes, the star join model falls apart and optimizers go to the tried and true relational join approach where tables are combined in a binary fashion.