2026-03-12 20:23:15

idev/perf_hit_ratio_by_session.sql

@@ -0,0 +1,54 @@
+-- +----------------------------------------------------------------------------+
+-- |                          Jeffrey M. Hunter                                 |
+-- |                      jhunter@idevelopment.info                             |
+-- |                         www.idevelopment.info                              |
+-- |----------------------------------------------------------------------------|
+-- |      Copyright (c) 1998-2011 Jeffrey M. Hunter. All rights reserved.       |
+-- |----------------------------------------------------------------------------|
+-- | DATABASE : Oracle                                                          |
+-- | FILE     : perf_hit_ratio_by_session.sql                                   |
+-- | CLASS    : Tuning                                                          |
+-- | PURPOSE  : Reports on all sessions along with their individual hit ratio.  |
+-- | NOTE     : As with any code, ensure to test this script in a development   |
+-- |            environment before attempting to run it in production.          |
+-- +----------------------------------------------------------------------------+
+
+SET LINESIZE 180
+SET PAGESIZE 9999
+
+COLUMN unix_id          FORMAT a10                  HEAD Username
+COLUMN oracle_id        FORMAT a10                  HEAD OracleID
+COLUMN os_user          FORMAT a20                  HEAD OS_User
+COLUMN sid              FORMAT 99999                HEAD SID
+COLUMN serial_id        FORMAT 999999               HEAD Serial#
+COLUMN unix_pid         FORMAT a9                   HEAD UNIX_Pid
+COLUMN consistent_gets  FORMAT 999,999,999,999,999  HEAD Cons_Gets
+COLUMN block_gets       FORMAT 999,999,999,999,999  HEAD Block_Gets
+COLUMN physical_reads   FORMAT 999,999,999,999,999  HEAD Phys_Reads
+COLUMN hit_ratio        FORMAT 999.00               HEAD Hit_Ratio
+
+SELECT
+    p.username            unix_id
+  , s.username            oracle_id
+  , s.osuser              os_user
+  , s.sid                 sid
+  , s.serial#             serial_id
+  , LPAD(p.spid,7)        unix_pid
+  , sio.consistent_gets   consistent_gets
+  , sio.block_gets        block_gets
+  , sio.physical_reads    physical_reads
+  , ROUND((consistent_gets+Block_gets-Physical_reads) /
+          (Consistent_gets+Block_gets)*100,2)             hit_ratio
+FROM
+    v$process p
+  , v$session s
+  , v$sess_io sio
+WHERE
+      p.addr (+) = s.paddr
+  AND s.sid      = sio.sid
+  AND (sio.consistent_gets + sio.block_gets) > 0
+  AND s.username is not null
+ORDER BY hit_ratio
+/
+
+