2026-03-12 20:23:15

vg/awr_parameter.sql

@@ -0,0 +1,97 @@
+@@header
+
+/*
+*
+*  Author     : Vishal Gupta
+*  Purpose    : Display database parameter changes from AWR Repository
+*  Parameters : 1 - Parameter Name          (Use % as wild card and \ as escape character)
+*               2 - Instance Number         ( Use % to query for all instances)
+*               3 - Number of days to query ( Default 30)
+*
+*  Revision History:
+*  ===================
+*  Date       Author        Description
+*  ---------  ------------  -----------------------------------------
+*  05-Jul-12  Vishal Gupta  Created
+*  
+*/
+
+
+
+/************************************
+*  INPUT PARAMETERS
+************************************/
+VARIABLE PARAM_NAME   VARCHAR2(100)
+VARIABLE INST_ID      VARCHAR2(100)
+VARIABLE DAYS         VARCHAR2(100)
+VARIABLE WHERECLAUSE  VARCHAR2(4000)
+
+BEGIN
+     :PARAM_NAME:= '&&1';
+     :INST_ID := '&&2';
+     :DAYS := '&&3';
+     :WHERECLAUSE := '&&4';
+     :PARAM_NAME := CASE WHEN NVL(:PARAM_NAME,'x') = 'x' THEN '%' ELSE :PARAM_NAME END;
+     :INST_ID := CASE WHEN NVL(:INST_ID,'x') = 'x' THEN '%' ELSE :INST_ID END;
+     :DAYS := CASE WHEN NVL(:DAYS,'x') = 'x' THEN '7' ELSE :DAYS END;
+END;
+/
+
+
+set head off
+SELECT '**********************************************'  || chr(10) ||
+       '* init.ora Parameter Change History'             || chr(10) ||
+       '* (From AWR Repository)'                         || chr(10) ||
+       '*'                                               || chr(10) ||
+       '* Input Parameters'                              || chr(10) ||
+       '*  - Parameter Name = "' || :PARAM_NAME || '"'   || chr(10) ||
+       '*  - Instance#      = "' || :INST_ID || '"'      || chr(10) ||
+       '*  - Days           = "' || :DAYS || '"'         || chr(10) ||
+       '**********************************************'  || chr(10) ||
+       ''
+FROM DUAL;       
+set head on
+
+
+COLUMN end_interval_time    HEADING "Snapshot Time"         FORMAT a18
+COLUMN instance_number      HEADING "I#"                    FORMAT 99 
+COLUMN parameter_name       HEADING "ParameterName"         FORMAT a31
+COLUMN value                HEADING "Current Value"         FORMAT a50
+COLUMN prev_value           HEADING "Previous Value"        FORMAT a50
+
+
+select TO_CHAR(a.end_interval_time,'DD-MON-YY HH24:MI:SS') end_interval_time
+     , a.instance_number
+     , a.parameter_name
+     --, a.ordinal
+     , a.value
+     , a.prev_value
+FROM
+ (SELECT /*+ LEADING(s pn) parallel(s,4) parallel(pn,4) */
+         s.end_interval_time 
+       , p.instance_number
+       , p.parameter_name
+       , p.VALUE
+       , lag(p.VALUE) OVER (PARTITION BY p.dbid, p.instance_number, p.parameter_hash
+                            ORDER BY p.dbid, p.snap_id, p.instance_number, p.parameter_hash) prev_value
+  FROM v$database d
+       JOIN dba_hist_snapshot s ON s.dbid = d.dbid  
+       JOIN dba_hist_parameter p ON p.dbid = s.dbid AND p.snap_id = s.snap_id AND p.instance_number = s.instance_number  
+  WHERE 1=1 
+    AND s.instance_number LIKE :INST_ID
+    AND s.end_interval_time > SYSDATE - :DAYS - (5/24) -- Check for 5 extra hours in past
+    AND p.parameter_name  LIKE  :PARAM_NAME  
+    --AND REPLACE(p.parameter_name,'_','!') NOT LIKE '!!%'  -- Filter AMM or ASMM modified parameters if in AWR.
+    AND p.parameter_name NOT LIKE '\_\_%' ESCAPE '\' -- Filter AMM or ASMM modified parameters if in AWR.
+    AND p.parameter_name NOT IN ('service_names')
+    AND NVL(p.VALUE,'x')  NOT LIKE '%SYS.KUPC$%'  -- Ignore DataPump export/import service name change
+  ) a
+WHERE 1=1
+  AND LOWER(NVL(a.value,'x')) <> LOWER(NVL(a.prev_value,'x'))
+  AND a.end_interval_time > sysdate - :DAYS 
+ORDER BY TO_DATE(TO_CHAR(a.end_interval_time,'DD-MON-YY HH24:MI'),'DD-MON-YY HH24:MI') 
+       , a.parameter_name
+       , a.instance_number
+;
+
+@@footer