oracle 10g alter

hello,

it's too odd to ask a question about 10g, we have plan to upgrade this database to 12.2 in next month..

but before that i got some error like this.  Does anyone come across this situation.  can we do something without database shutdown ?

I reset my password to 'temp123' for my id: ramya1

SQL> show user

USER is "SYS"

SQL> select version from v$instance;

VERSION

-----------------

10.2.0.3.0

SQL> alter user ramya1 identified by temp123tom;

User altered.

SQL> connect ramya1/ temp123tom

ERROR:

ORA-01017: invalid username/password; logon denied

Warning: You are no longer connected to ORACLE.