User sessions ordered by Logical I/O

-- |----------------------------------------------------------------------------|
-- | DATABASE : Oracle                                                          |
-- | FILE     : sess_users_by_io.sql                                            |
-- | CLASS    : Session Management                                              |
-- | PURPOSE  : List all currently connected user sessions ordered by Logical   |
-- |            I/O.                                                            |
-- | NOTE     : As with any code, ensure to test this script in a development   |
-- |            environment before attempting to run it in production.          |
-- +----------------------------------------------------------------------------+


SET LINESIZE 145
SET PAGESIZE 9999


COLUMN sid               FORMAT 99999            HEADING 'SID'
COLUMN serial_id         FORMAT 999999           HEADING 'Serial#'
COLUMN session_status    FORMAT a9               HEADING 'Status'          JUSTIFY right
COLUMN oracle_username   FORMAT a12              HEADING 'Oracle User'     JUSTIFY right
COLUMN os_username       FORMAT a9               HEADING 'O/S User'        JUSTIFY right
COLUMN os_pid            FORMAT 9999999          HEADING 'O/S PID'         JUSTIFY right
COLUMN session_program   FORMAT a18              HEADING 'Session Program' TRUNC
COLUMN session_machine   FORMAT a8               HEADING 'Machine'         JUSTIFY right TRUNC
COLUMN logical_io        FORMAT 999,999,999,999  HEADING 'Logical I/O'
COLUMN physical_reads    FORMAT 999,999,999,999  HEADING 'Physical Reads'
COLUMN physical_writes   FORMAT 999,999,999,999  HEADING 'Physical Writes'


prompt 
prompt +----------------------------------------------------+
prompt | User Sessions Ordered by Logical I/O               |
prompt +----------------------------------------------------+


SELECT
    s.sid                sid
  , s.serial#            serial_id
  , lpad(s.status,9)     session_status
  , lpad(s.username,12)  oracle_username
  , lpad(s.osuser,9)     os_username
  , lpad(p.spid,7)       os_pid
  , s.program            session_program
  , lpad(s.machine,8)    session_machine
  , sstat1.value
    + sstat2.value         logical_io
  , sstat3.value         physical_reads
  , sstat4.value         physical_writes
FROM 
    v$process  p
  , v$session  s
  , v$sesstat  sstat1
  , v$sesstat  sstat2
  , v$sesstat  sstat3
  , v$sesstat  sstat4
  , v$statname statname1
  , v$statname statname2
  , v$statname statname3
  , v$statname statname4
WHERE
      p.addr (+)            = s.paddr
  AND s.sid                 = sstat1.sid
  AND s.sid                 = sstat2.sid
  AND s.sid                 = sstat3.sid
  AND s.sid                 = sstat4.sid
  AND statname1.statistic#  = sstat1.statistic#
  AND statname2.statistic#  = sstat2.statistic#
  AND statname3.statistic#  = sstat3.statistic#
  AND statname4.statistic#  = sstat4.statistic#
  AND statname1.name        = 'db block gets'
  AND statname2.name        = 'consistent gets'
  AND statname3.name        = 'physical reads'
  AND statname4.name        = 'physical writes'
ORDER BY logical_io DESC
/