Know how to log in to Oracle without a user's password

Scenario Description: Sometimes we may not know a user's password, but also need to do some of the user's identity to do some operations, and can not modify the user's password, this time, you can use some tips to complete the operation.
Original from the "Bit network", reproduced please keep the original link: http://soft.chinabyte.com/database/13/12101013.shtml

1. Login with SYS user

Sqlplus/nolog;

Connect sys/oracle as SYSDBA;

2. Log in to view the user name and password

Select Username,password from Dba_users;

3. Find the user Change password (if the user is test, the password is modified to test)

Alter user test identified by test;

4 Login with test user

Connect Test/test

Know how to log in to Oracle without a user's password