SQL> select * from dba_users;
 
USERNAME                          USER_ID     PASSWORD   
MGMT_VIEW                           53     F25A184809D6458D 
SYS                                  0     D8898E4A8BEF402D
SYSTEM                               5     7E6E822C54BEBF48
PASSWORD这一栏是不是故意加密的?因为我SYS,SYSTEM的密码都是123,看到的是上面这个