-- +----------------------------------------------------------------------------+
-- |                          Jeffrey M. Hunter                                 |
-- |                      jhunter@idevelopment.info                             |
-- |                         www.idevelopment.info                              |
-- |----------------------------------------------------------------------------|
-- |      Copyright (c) 1998-2012 Jeffrey M. Hunter. All rights reserved.       |
-- |----------------------------------------------------------------------------|
-- | 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 TERMOUT OFF;
COLUMN current_instance NEW_VALUE current_instance NOPRINT;
SELECT rpad(instance_name, 17) current_instance FROM v$instance;
SET TERMOUT ON;

PROMPT 
PROMPT +------------------------------------------------------------------------+
PROMPT | Report   : User Sessions Ordered by Logical I/O                        |
PROMPT | Instance : &current_instance                                           |
PROMPT +------------------------------------------------------------------------+

SET ECHO        OFF
SET FEEDBACK    6
SET HEADING     ON
SET LINESIZE    180
SET PAGESIZE    50000
SET TERMOUT     ON
SET TIMING      OFF
SET TRIMOUT     ON
SET TRIMSPOOL   ON
SET VERIFY      OFF

CLEAR COLUMNS
CLEAR BREAKS
CLEAR COMPUTES

COLUMN sid               FORMAT 999999            HEADING 'SID'
COLUMN serial_id         FORMAT 99999999          HEADING 'Serial ID'
COLUMN session_status    FORMAT a9                HEADING 'Status'
COLUMN oracle_username   FORMAT a12               HEADING 'Oracle User'
COLUMN os_username       FORMAT a12               HEADING 'O/S User'
COLUMN os_pid            FORMAT a8                HEADING 'O/S PID'
COLUMN session_machine   FORMAT a25               HEADING 'Machine'          TRUNC
COLUMN session_program   FORMAT a40               HEADING 'Session Program'  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'

SELECT
    s.sid                 sid
  , s.serial#             serial_id
  , s.status              session_status
  , s.username            oracle_username
  , s.osuser              os_username
  , p.spid                os_pid
  , s.machine             session_machine
  , s.program             session_program
  , 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
/