C:\Users\user>sqlplus/nolog
SQL*Plus: Release 11.2.0.2.0 Production on 일 7월 1 19:33:44 2018
Copyright (c) 1982, 2014, Oracle. All rights reserved.
SQL> conn/as sysdba
Connected.
SQL> alter user system identified by <새로운 비밀번호>;
User altered.
SQL> alter user sys identified by <새로운 비밀번호>;
User altered.커맨드 창을 열어 입력해주면 끝.