When You tried login your user(TEST) it is showing password will expired with 7 Days.
[oracle@k44-db1]$ sqlplus test/test
SQL*Plus: Release 11.2.0.2.0 Production on Mon Mar 11 22:34:42 2013
Copyright (c) 1982, 2011, Oracle. All rights reserved.
Enter password:
ERROR:
ORA-28002: the password will expire within 7 days
Connected to:
Oracle Database 11g Express Edition Release 11.2.0.2.0 - 64bit Production
SQL>
Get to know which profile the test user is using from dba_users view,
SQL> SELECT profile FROM dba_users WHERE username='TEST';
USERNAME PROFILE
-------- ----------
TEST DEFAULT
Now check the password lifetime of the default profile from dba_profiles
SQL> SELECT resource_name,limit FROM dba_profiles WHERE profile='DEFAULT' AND resource_name='PASSWORD_LIFE_TIME';
and than set default profile limit to unlimited for below query,
SQL> ALTER PROFILE DEFAULT LIMIT PASSWORD_LIFE_TIME UNLIMITED;
Profile altered.
after profile limit changed and Alter user(TEST) password for the below statement,
SQL> alter user test identified by test;
User altered.
after that alter username and try to connect test user,
[oracle@k44-db1]$ sqlplus test/test
SQL*Plus: Release 11.2.0.3.0 Production on Fri Jul 25 11:50:15 2014
Copyright (c) 1982, 2011, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Real Application Clusters, OLAP, Data Mining
and Real Application Testing options
SQL>
Thank and Advance......
