A data warehouse is a central repository of information that can be analyzed to make more informed decisions. Data flows into a data warehouse from transactional systems, relational databases, and other sources, typically on a regular cadence. Business analysts, data engineers, data scientists, and decision-makers access the data through business intelligence (BI) tools, SQL clients, and other analytics applications.

The benefits of a data warehouse include the following:

  • Informed decision making
  • Consolidated data from many sources
  • Historical data analysis
  • Data quality, consistency, and accuracy
  • Separation of analytics processing from transactional databases, which improves the performance of both systems

The following illustration shows the key steps of an end-to-end analytics process

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