oracle tracing

oracle tracing
FLOWS schema flows_010309 has been granted "alter session" & "create any trigger"

SQL> connect flows_010309@rcdb
Enter password:
Connected.
SQL> create or replace trigger login_trigger
 2  after logon on database
 3  begin
 4       execute immediate 'alter session set sql_trace=true';
 5  end;
 6  /