2026-03-12 20:23:15

csierra/parameter_change.sql

@@ -0,0 +1,44 @@
+SET HEA ON LIN 500 PAGES 100 TAB OFF FEED OFF ECHO OFF VER OFF TRIMS ON TRIM ON TI OFF TIMI OFF;
+
+COL parameter_name FOR A30;
+COL value FOR A30;
+COL prior_value FOR A30;
+
+WITH
+all_parameters AS (
+SELECT /*+  MATERIALIZE NO_MERGE   DYNAMIC_SAMPLING(4)  */ /* 1a.30 */
+       snap_id,
+       dbid,
+       con_id,
+       instance_number,
+       parameter_name,
+       value,
+       isdefault,
+       ismodified,
+       LAG(value) OVER (PARTITION BY dbid, con_id, instance_number, parameter_hash ORDER BY snap_id) prior_value
+  FROM dba_hist_parameter
+)
+SELECT /*+  NO_MERGE  */ /* 1a.30 */
+       TO_CHAR(s.begin_interval_time, 'YYYY-MM-DD HH24:MI:SS') begin_time,
+       TO_CHAR(s.end_interval_time, 'YYYY-MM-DD HH24:MI:SS') end_time,
+       p.snap_id,
+       p.con_id,
+       --p.dbid,
+       p.instance_number,
+       p.parameter_name,
+       p.value,
+       p.isdefault,
+       p.ismodified,
+       p.prior_value
+  FROM all_parameters p,
+       dba_hist_snapshot s
+ WHERE p.value != p.prior_value
+   AND s.snap_id = p.snap_id
+   AND s.dbid = p.dbid
+   AND s.instance_number = p.instance_number
+ ORDER BY
+       s.begin_interval_time DESC,
+       --p.dbid,
+       p.instance_number,
+       p.parameter_name
+/