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Redshift is a petabyte-scale data warehousing solution. It’s a column-based database designed for analytical workloads. Generally, a relational store like RDS would be used for OLTP workloads (e.g., queries, inserts, updates, and deletes), and Redshift would be used for OLAP (e.g., retrieval and analytics). Multiple databases become source data to be injected into a data warehouse solution such as Redshift.