Big Data 3. Data Warehouses, Data Lakes, and Lake Houses
1. Data Warehouses A Data Warehouse (DW) is a centralized repository that aggregates data from multiple sources into a unified, consistent store optimized for analytics and business intelligence (BI) activities, such as reporting, forecasting, and data mining. Unlike transactional databases (OLTP), data warehouses are built for analytical workloads (OLAP): they support complex queries over large volumes of data, often using denormalized schemas, dimensions, and facts for performance. Data warehouses typically use: ...