thank you for sharing so much information on your blog. I am learning something new every day i read your blog.

As you probably know, in 10g you can use a simpler logon trigger which only fires when a specific schema logs on:

create or replace trigger enable_sql_trace
after logon on CBQT.SCHEMA
BEGIN
dbms_monitor.session_trace_enable(null,null,true,true);
end;
/

Regards,
Martin