About Oracle Database
The relational database under most enterprise applications you'll find on a CIO's stack diagram.
Oracle Database is the multi-model relational database from Oracle Corporation, currently in version 23ai. It runs on-prem, on Oracle Cloud Infrastructure and on the major hyperscalers, and supports relational, JSON, graph, spatial and vector workloads in a single engine. It is the database under Oracle Fusion Cloud, JD Edwards and Siebel, under most banking core systems, and under thousands of internal applications written between 1995 and last quarter.
The point of pulling Oracle into a warehouse is that the data inside it is usually the most valuable in the company and the hardest to get at. Schemas are large, packages and triggers carry a lot of business logic, and reporting on the production instance competes with the nightly batch window that finance still depends on. In a warehouse, your Oracle tables and views become a first-class source next to Salesforce, Dynamics, Snowflake and the accounting ledger, queryable in SQL without anyone touching the production listener.