Supondo que o banco de dados Oracle (deve funcionar também para o SAMPLE do Oracle-XE) esteja no Unix, ssh-in e:
sqlplus /nolog
SQL> connect / as SYSDBA
Connected.
SQL> SELECT username, account_status FROM dba_users WHERE ACCOUNT_STATUS LIKE '%EXPIRED%';
# ... your locked account should be listed ...
SQL> ALTER USER sample IDENTIFIED BY sample;
User altered.
SQL> ALTER USER sample ACCOUNT UNLOCK;
User altered.
SQL> ALTER PROFILE DEFAULT LIMIT PASSWORD_LIFE_TIME UNLIMITED;
Profile altered.
SQL> exit
