What is the difference between star schema and snowflake schema?
The main difference between star schema and snowflake schema is that the star schema is highly denormalized and the snowflake schema is normalized. So the data access latency is less in star schema in comparison to snowflake schema. As the star schema is denormalized, the size of the data warehouse will be larger than that of snowflake schema. The schemas are selected as per the client requirements. Performance wise, star schema is good. But if memory utilization is a major concern, then snow flake schema is better than star schema.