Amore simplistic equivalent diagram to that of Figure (Web site management)
Amore simplistic equivalent diagram to that of Figure 7-4 is shown by the snowflake schema in Figure 7-5. Figure 7-5: The SALE fact-dimensional structure is a snowflake schema. The problem with snowflake schemas isn t too many tables but too many layers. Data warehouse fact tables can become incredibly large, even to millions, billions, even trillions of records. The critical factor in creating star and snowflake schemas, instead of using standard nth Normal Form layers, is decreasing the number of tables in SQL query joins. The more tables in a join, the more complex a query, the slower it will execute. When fact tables contain enormous record counts, reports can take hours and days, not minutes. Adding just one more table to a fact-dimensional query join at that level of database size could make the query run for weeks. That s no good! Book Publication Publisher Customer Shipper Author Subject One-To-Many Relationship Sale Category 179 Understanding Data Warehouse Database Modeling
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