title: Oracle novice - can't login with username/password
body: <p>I just installed Oracle 11g, and when I try to work with SQLPLUS, after I put the username/password, it says "invalid username/password". The only way to log in is using "sqlplus as / sysdba". But I want to login with the correct username/password which I put during the installation phase, since I want to use them in a JPA project. Should I add another username/password after the installation? If yes, how can I do this? (First time user in Oracle).</p>