SET lines 1000
SET pagesize 32767
TTITLE "###### Hit Ratio for Each User ###### " 

COLUMN sid FORMAT 9999
COLUMN username FORMAT a10
COLUMN osuser FORMAT a10
COLUMN logon_time FORMAT a14
COLUMN sql_text FORMAT a50
COLUMN "%Hit" FORMAT 999.99

select s.sid
     , s.username
     , s.osuser
     , to_char(s.logon_time,'DD-MM-YY HH24:MI') logon_time
     , round(100* (1 - (io.physical_reads/ (io.block_gets + io.consistent_gets))),2) "%Hit"
     , io.physical_reads
     , st.sql_text 
from  v$session s, v$sess_io io, v$sqltext_with_newlines st
where s.sql_address = st.address
and   s.sql_hash_value = st.hash_value
and   s.sid = io.sid
and   io.block_gets + io.consistent_gets > 0
and   s.username is not null
order by 5 desc 
/

SET lines 80
SET pagesize 80
TTITLE OFF