Use this SQL*Plus procedure to unlock and reset user account passwords.

1. Start SQL*Plus and log in as the SYS user, connecting as SYSDBA:

   $ $ORACLE_HOME/bin/sqlplus
   SQL> CONNECT SYS as SYSDBA
   Enter password: sys_password 

2. Enter the command ALTER USER account IDENTIFIED BY password ACCOUNT UNLOCK; to unlock an account.

   Note:

   If you unlock an account but do not reset the password, then the password remains expired. The first time someone connects as that user, they must change the user's password.