ArcSDE technology is an integrated part of ArcGIS Desktop and ArcGIS Server and a core element of any enterprise GIS solution. Its primary role is to act as the database access engine to spatial data, its associated attributes, and metadata stored within a relational database management system (RDBMS).
Scalable geodatabases (e.g., Enterprise, Workgroup, and Personal) have a multitier architecture that implements advanced logic and behavior in the application tier (e.g., ArcGIS software) on top of a storage tier (e.g., RDBMS software). ArcSDE technology fuses ArcGIS application logic with information management in an RDBMS. It is utilized to enhance data management performance, extend the range of data types that can be stored in an RDBMS, and facilitate a multiuser editing environment.
product:Esri Arcgis Arcsde 9.2