A good tool to monitor your users password is the one developed by Red database security.

It’s called checkpwd.

Download it on there website
On the command line simply type:

C:\checkpwd [oradba_user]/[password]@[tns entry] [your_password _file _location.txt]
On oracle 8i it’s easy but now with Oracle 10g, to connect as sysdba we have to specify for example in SQLPLUS:

SQL>conn sys/[password] as sysdba

This is apparently not taken into account yet and it fails to recognize the command with the extra words “as sysdba”.