Star Schema vs Snowflake Schema: Which to Use and When

Short summary

Star schemas denormalize dimensions into single tables, making queries simpler and faster on modern columnar data warehouses. Snowflake schemas normalize dimensions into sub-hierarchies, saving storage but requiring more joins and complex queries. Use star schemas by default for analytics; only snowflake specific dimensions when storage savings are material or compliance rules require a single authoritative table.

• •Star schema: denormalized, fewer joins, faster queries, simpler to maintain
• •Snowflake schema: normalized, more joins, slower queries, smaller storage footprint
• •Best practice: use star for most cloud analytics; snowflake only for compliance or massive repetitive dimensions

Generated with AI, which can make mistakes.