Oracle Database Discussions

Hi,
I have created a new database on Oracle 9i 2, I did not find the correct pfile parameter for the NLS_LENGTH_SEMANTICS setting.
So have created a standart UTF8 database and now I am trying to change the standard NLS_LENGTH_SEMANTICS=BYTE to CHAR. When I execute the following command in SQL PLUS "ALTER SYSTEM SET NLS_LENGTH_SEMANTICS=CHAR SCOPE=BOTH"
The system is tells me that command is successfully executed.

But when I look at the NLS_DATABASE_PARAMETERS table I do not see any change for the NLS_LENGTH_SEMANTICS parameter.
I have also restarted the instance but still everything is the same as it was before.
Do you know what I am doing wrong?
Regards
RobH