-- +----------------------------------------------------------------------------+
-- |                          Jeffrey M. Hunter                                 |
-- |                      jhunter@idevelopment.info                             |
-- |                         www.idevelopment.info                              |
-- |----------------------------------------------------------------------------|
-- |      Copyright (c) 1998-2011 Jeffrey M. Hunter. All rights reserved.       |
-- |----------------------------------------------------------------------------|
-- | DATABASE : Oracle                                                          |
-- | FILE     : perf_file_waits.sql                                             |
-- | CLASS    : Tuning                                                          |
-- | PURPOSE  : Reports on Busy Buffer Waits per file.                          |
-- | 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 filename  FORMAT a58           HEAD "File Name"
COLUMN file#     FORMAT 999           HEAD "File #"
COLUMN ct        FORMAT 999,999,999   HEAD "Waits (count)"
COLUMN time      FORMAT 999,999,999   HEAD "Time (cs)"
COLUMN avg       FORMAT 999.999       HEAD "Avg Time"


SELECT
    a.indx + 1  file#
  , b.name      filename
  , a.count     ct
  , a.time      time
  , a.time/(DECODE(a.count,0,1,a.count)) avg
FROM
    x$kcbfwait   a
  , v$datafile   b
WHERE
      indx < (SELECT count(*) FROM v$datafile)
  AND a.indx+1 = b.file#
ORDER BY a.time
/