变更密码的方式

SQL> select username,password from dba_users where username='twojliu';

USERNAME PASSWORD
------------------------------ ------------------------------

TWOJLIU 010CD1914E5AB20C

SQL> alter user twojliu identified by abc;

User altered.

SQL> conn twojliu
Connected.
SQL> conn / as sysdba
Connected.
SQL> alter user twojliu identified by values '010CD1914E5AB20C';

User altered.