2026-03-12 20:23:15

tpt/ash/rowsource_events.sql

@@ -0,0 +1,48 @@
+-- Copyright 2018 Tanel Poder. All rights reserved. More info at http://tanelpoder.com
+-- Licensed under the Apache License, Version 2.0. See LICENSE.txt for terms & conditions.
+
+--------------------------------------------------------------------------------
+--
+-- File name:   rowsource_events.sql
+-- Purpose:     Display top ASH time (count of ASH samples) grouped by 
+--              exeution plan rowsource type and session serial/parallel
+--              status.
+--
+--              This allows to find out if your parallel slaves are doing
+--              buffered full table scan IOs.
+--              
+-- Author:      Tanel Poder
+-- Copyright:   (c) http://blog.tanelpoder.com
+--              
+-- Usage:       
+--     @rowsource_events.sql
+--
+-- Other:
+--     Requires Oracle 11g+
+--
+--------------------------------------------------------------------------------
+SELECT * FROM (
+SELECT 
+    COUNT(*) seconds
+  , ROUND(RATIO_TO_REPORT(COUNT(*)) OVER () * 100, 1) pct
+  , sql_plan_operation||' '||sql_plan_options plan_line
+  , CASE WHEN qc_session_id IS NULL THEN 'SERIAL' ELSE 'PARALLEL' END is_parallel
+  , session_state
+  , wait_class
+  , event
+FROM 
+    gv$active_session_history
+WHERE
+    sql_plan_operation LIKE '&1'
+AND sql_plan_options   LIKE '&2'
+AND sample_time > SYSDATE - 1/24
+GROUP BY
+    sql_plan_operation||' '||sql_plan_options 
+  , CASE WHEN qc_session_id IS NULL THEN 'SERIAL' ELSE 'PARALLEL' END
+  , session_state
+  , wait_class
+  , event
+ORDER BY COUNT(*) DESC
+)
+WHERE rownum <= 20
+/