That is correct, star schema is generally not normalized uses FLAT dimension tables.
SNOWFLAKE schema is generally associated with 3NF data warehouse design.
If you are concerned with performance, stick with the STAR schema.
The brunt of the work is designing the dimension tables (fact table design is simple), and populating the fact tables. Once you've done that, the real fun begins with OLAP cubes.
Kalman Toth - Database, Data Warehouse & Business Intelligence Architect
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