You can use Sql>sqlplus/as when you log in SYSDBA
will prompt you to output the password, the direct return, you find unexpectedly can log in, as for this sqlplus level younger brother temporarily still do not know, next sql>alter user sys identified by admin (this you arbitrarily set); After execution you find the hint: the user has changed
This means that your sys password has been changed to admin, you can sql>conn sys/admin as sysdba after you know the password of sys, you are the boss, you can change the password of system and Scott, In fact, Scott's default password is Tiger, can be used directly, but the first login will prompt you to modify, if you are turned into a test with this is also very good.
Sql> alter user Scott identified by Tiger;
The user has changed.
Sql>conn Scott/tiger
Oracle 11g Sys,system,scott Password not set up a workaround