Elipse E3 uses ADO (ActiveX Data Object) and OCI (Oracle Call Interface) technologies to access an Oracle database.

ADO is a technology used by E3Browser and E3Chart to retrieve data stored in a database. ADO is also widely used in Elipse E3 scripts for all types of operations with a database. It is a set of COM (Component Object Model) objects created to access DBMS (Database Management Systems) information using OLE DB (Object Linking and Embedding), and it is available when installing OLE DB Provider for Oracle (MSDAORA), and allows access to Oracle's native interface, OCI.

OCI is used by Elipse E3's Database object to implement database services used by Historic objects, Formulas, Alarms, and Storage. With OCI, users have direct access to functions of an Oracle server, making this process as optimized as possible. It provides a default database access library and data retrieval functions as a DLL or LIB, which can be linked to an application at run time.