Для сброса пароля следуйте приведенным ниже инструкциям:
SQL> select username,profile from dba_users where username='TEST_USER';
USERNAME PROFILE
------------------------------ ------------------------------
TEST_USER DEFAULT
SQL>
SQL> select profile, limit from dba_profiles where resource_name =
'PASSWORD_VERIFY_FUNCTION' and profile='DEFAULT';
PROFILE LIMIT
------------------------------ ----------------------------------------
DEFAULT VERIFY_PASSWORD_FUNCTION
SQL> ALTER PROFILE "DEFAULT" LIMIT PASSWORD_VERIFY_FUNCTION null;
Profile altered.
SQL> alter user TEST_USER identified by pteis34;
User altered.
SQL> ALTER PROFILE "DEFAULT" LIMIT PASSWORD_VERIFY_FUNCTION VERIFY_PASSWORD_FUNCTION;
Profile altered.
SQL> conn TEST_USER/pteis34@DB_STRING
Connected.
SQL> show user
USER is "TEST_USER"
SQL>