2026-03-12 20:23:15

mhouri/checkUndoAsh.sql

@@ -0,0 +1,28 @@
+/* --------------------------------------------------------------
+Author : Mohamed Houri
+Date   : 24/08/2015
+If you want to know what object are read
+in ASH then use the following script
+Particularly :
+   -- if current_obj = 0 then this means you are reading from 
+                       undo block(useful to check read consistency)
+					   
+   -- if current_obj = -1 then this means you are working on cpu                      					   
+----------------------------------------------------------------------- */
+select
+     decode(current_obj#
+            ,0
+            ,'undo block'
+            ,-1
+            ,'cpu'
+            ,current_obj#) cur_obj
+   , count(1)
+from 
+     gv$active_session_history
+where 
+   sample_time between to_date('&date_from', 'ddmmyyyy hh24:mi:ss')
+                  and  to_date('&date_from', 'ddmmyyyy hh24:mi:ss')
+and event = 'db file sequential read'
+and sql_id = '&sql_id'
+group by current_obj# 
+order by 2 asc;