CURSOR_SHARING на 9i : Oracle

create or replace trigger USER_LOGON
  after logon on database  
 
declare
  p varchar2(2000);
begin
  select program into p 
      from v$session 
         where sid=(select distinct sid from sys.v_$mystat);
    if p ='' or  p is null or  
       upper(p) like upper('%rwrbe60%')  
     then 
        execute immediate 'alter session set cursor_sharing=EXACT';
     end if;
end USER_LOGON;