A_DBM_LOGIN indicates the user name under which you want to connect to the database system. Not all databases require a user login name.
Example
To connect to the database with the user name MYNAME, you could specify:
A_DBM_LOGIN MYNAME
or
A_DBM_LOGIN myname
in the runtime configuration file. There is no default value for this variable. If no login is specified, none is used.
See also
A_DBM_PASSWD runtime configuration file variable