A data warehouse is a central repository that stores structured and semi-structured data from multiple sources for reporting and analysis. Unlike operational databases optimized for transactions, data warehouses are designed for complex queries and analytics. They use dimensional modeling with fact tables and dimension tables, and support techniques like ETL (Extract, Transform, Load) processes. Modern data warehouses like Snowflake, BigQuery, and Redshift offer cloud scalability, automatic optimization, and integration with BI tools for business intelligence and advanced analytics.
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