When I installed the oracle software, I've changed the password of the SYS, SYSTEM according to the wizard. I canuse SYS/newpassword, SYSTEM/newpassword to startup the database instance and listener, but can not logon the database with them. It confused me. I installed the database as the installation docs tell me. Also I intalled the samples. So I can logon with scott, BI in sqlplus except the em.
