2026-03-12 20:23:15

idev/perf_top_sql_by_buffer_gets.sql

@@ -0,0 +1,51 @@
+-- +----------------------------------------------------------------------------+
+-- |                          Jeffrey M. Hunter                                 |
+-- |                      jhunter@idevelopment.info                             |
+-- |                         www.idevelopment.info                              |
+-- |----------------------------------------------------------------------------|
+-- |      Copyright (c) 1998-2011 Jeffrey M. Hunter. All rights reserved.       |
+-- |----------------------------------------------------------------------------|
+-- | DATABASE : Oracle                                                          |
+-- | FILE     : perf_top_sql_by_buffer_gets.sql                                 |
+-- | CLASS    : Tuning                                                          |
+-- | PURPOSE  : Report on top SQL statements ordered by most buffer gets.       |
+-- | 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
+SET VERIFY   off
+
+COLUMN username        FORMAT a18                  HEADING 'Username'
+COLUMN buffer_gets     FORMAT 999,999,999,999,999  HEADING 'Buffer Gets'
+COLUMN executions      FORMAT 999,999,999,999,999  HEADING 'Executions'
+COLUMN gets_per_exec   FORMAT 999,999,999,999,999  HEADING 'Gets / Executions'
+COLUMN sql                                         HEADING 'SQL Statement'
+
+BREAK ON report
+COMPUTE sum OF buffer_gets    ON report
+COMPUTE sum OF executions     ON report
+COMPUTE sum OF gets_per_exec  ON report
+
+prompt 
+prompt =============================================
+prompt SQL with buffer gets greater than 1000
+prompt =============================================
+
+
+SELECT
+    UPPER(b.username)                                        username
+  , a.buffer_gets                                            buffer_gets
+  , a.executions                                             executions
+  , a.buffer_gets / decode(a.executions, 0, 1, a.executions) gets_per_exec
+  , sql_text || chr(10) || chr(10)                           sql 
+FROM 
+    sys.v_$sqlarea a
+  , dba_users b
+WHERE
+      a.parsing_user_id = b.user_id 
+  AND a.buffer_gets > 1000
+  AND b.username NOT IN ('SYS','SYSTEM')
+ORDER BY
+    buffer_gets desc;