Connect to Oracle Database via command line/enter SQL Plus

1. Open SQL Plus login directly, require username and password

Start-"program-" oracle-"Application development-" Sqlplus

My computer is "start"-"oracle-oradb11g_home1"-"Application Development"-"SQL Plus"

After the database installation is complete, there are two system-level users:
System default password: Manager
SYS default password: change_on_install

2. Go to cmd Command window, do not use user name and password

(1) Login Sqlplus/nolog
(2) Connection database: Connect/as sysdba
(3) Modify user Password (example: Modify sys user password to 123): Alter USER SYS identified by 123;

Note that there is a semicolon can not be omitted, otherwise it will automatically appear after the input "2" waiting for you to continue to enter.

Connect to Oracle Database via command line/enter SQL Plus