Connection between an AS ABAP and a database system. A database connection defines the address of the database system, the database user, and hence the database schema associated with this user. By default, the database interface uses the standard connection of the current work process to access the standard AS ABAP connection. Optionally, database accesses can also be performed on secondary databases using secondary connections or on the standard database using service connections. Up to 16 database connections can be opened for a single work process.