ArcSDE (Spatial Database Engine) was Esri's technology that allowed ArcGIS to store and manage geographic data in a relational database management system (RDBMS). It acted as a gateway between ArcGIS and databases like Oracle, SQL Server, PostgreSQL, and IBM Db2, enabling multi-user access and editing of spatial data. While ArcSDE as a standalone product has been retired, its core functionality is now integrated into the ArcGIS Enterprise geodatabase. It was commonly used to manage large geospatial datasets in enterprise environments where data integrity, security, and concurrent access were critical.
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