A_ODBC_LOGIN indicates the user name under which you want to connect to the database system. Not all data sources require a user login name. Those that do may have case requirements. Check your data source documentation to determine if login is case sensitive.
Example
To connect to the database with the user name MYNAME, you could specify:
A_ODBC_LOGIN MYNAME
or
A_ODBC_LOGIN myname
in the runtime configuration file. There is no default value for this variable. If no login is specified, none will be used.
See also
A_ODBC_PASSWD runtime configuration file variable