User data for logging on to the database instance and, in some cases, other data can be entered as options when calling the SAP DB Tools, the C/C++ Precompiler, or the application programs.
If you explicitly specify the minimum required options (in most cases, this is the options -u, -d, and -n) and this data is complete and contains no errors, you are logged on to the desired database tool or the C/C++ Precompiler is called.
When logging on to the Database Manager GUI or SQL Studio, you can also enter user data using a logon screen.
The Database Manager CLI and the C/C++-Precompiler support User Data Using XUSER.