11g Oracle User Password expiration issue

Oracle 11g before the default user is not the limit of password expiration, in Oracle 11g, the default profile enabled password expiration time is 180 days. As follows:
SELECT * from Dba_profiles where profile= ' DEFAULT ' and resource_name= ' password_life_time ';
Expired passwords can be modified by the alter user userxxx identified by xxx;

If you want to set a password that is not available, the administrator can log in and execute:
ALTER Profile DEFAULT LIMIT password_life_time UNLIMITED;
Can.

11g Oracle User Password expiration issue