2026-03-12 20:23:15

idev/perf_file_waits.sql

@@ -0,0 +1,40 @@
+-- +----------------------------------------------------------------------------+
+-- |                          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
+/
+