2026-03-12 20:23:15

vdh/top_optstat_targets.sql

@@ -0,0 +1,92 @@
+/* top 10 targets based upon the cbo calculation duration
+   
+   The sql statement checks for the 10 ranked segments based upon their longest cbo stats collection duration
+*/
+
+set linesize 300
+set pages 50000
+
+column operation format a30
+column target format a50
+column target_type format a25
+column nbr_blocks format 9G999G999G999
+column start_time_str format a30
+column end_time_str format a30
+column status format a15
+column duration format a15
+column estimated_cost format 999G999
+column target_notes_xml format a200
+column ops_notes_xml format a200
+column nbr_blocks format 9G999G999G999
+
+-- rank the different collection duration per target
+with
+target_ranking
+as
+( select
+    opid,
+    target,
+    target_type,
+    target_size,
+    start_time,
+    end_time,
+    cast ((end_time - start_time) as interval day(2) to second(0)) duration,
+    status,
+    estimated_cost,
+    notes,
+    dense_rank() over
+      ( partition by target, target_type
+        order by cast ((end_time - start_time) as interval day(2) to second(0)) desc
+      ) trgt_rank
+  from
+    dba_optstat_operation_tasks
+),
+-- take the longest duration for each target and order these targets on duration, selecting the top 10 targets
+filtered_targets
+as
+( select
+    --+ MATERIALIZE
+    *
+  from
+    ( select
+        opid,
+        target,
+        target_type,
+        target_size,
+        start_time,
+        end_time,
+        duration,
+        status,
+        estimated_cost,
+        notes
+      from
+        target_ranking
+      where
+        trgt_rank = 1
+      order by
+        duration desc
+    )
+  where
+    rownum <= 10
+)
+-- join the filtered targets with the parent operation
+select
+  tgt.opid,
+  ops.operation,
+  tgt.target,
+  tgt.target_type,
+  tgt.target_size nbr_blocks,
+  to_char(tgt.start_time, 'DD/MM/YYYY HH24:MI:SS TZH:TZM') start_time_str,
+  to_char(tgt.end_time, 'DD/MM/YYYY HH24:MI:SS TZH:TZM') end_time_str,
+  tgt.duration,
+  tgt.status,
+--  tgt.estimated_cost,
+  xmlserialize(content xmltype(nvl2(tgt.notes, tgt.notes, '<notes/>')) as clob indent size = 2) target_notes_xml,
+  xmlserialize(content xmltype(nvl2(ops.notes, ops.notes, '<notes/>')) as clob indent size = 2) ops_notes_xml
+from
+  filtered_targets                  tgt
+    join dba_optstat_operations     ops
+      on ( tgt.opid = ops.id)
+order by
+  duration desc
+;