How to create externally identified user

This is an example how to create externally identified user in Oracle; i.e. if you want the os
oracle user to connect to database without supplying password run the following statement from
sqlplus:

SQL> create user OPS$ORACLE identified externally
     default tablespace users
     temporary tablespace temp;

SQL> grant dba to OPS$ORACLE

Note: it is recommended to set REMOTE_OS_AUTHENT to FALSE, otherwise you are opening a
security hole