2026-03-12 20:23:15

tpt/demos/bind_peeking.sql

@@ -0,0 +1,60 @@
+-- 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:   demos/bind_peeking.sql
+--
+-- Purpose:     Advanced Oracle Troubleshooting Seminar demo script
+--
+-- Author:      Tanel Poder ( http://www.tanelpoder.com )
+--
+-- Copyright:   (c) 2007-2009 Tanel Poder
+--
+--------------------------------------------------------------------------------
+
+set echo on
+
+drop table t;
+create table t as select * from dba_objects, (select rownum from dual connect by level <= 20);
+create index i on t(object_id);
+
+exec dbms_stats.gather_table_stats(user, 'T');
+
+select count(*), min(object_id)
+, max(object_id) from t;
+
+pause
+
+var x number
+
+exec :x := 100000
+
+pause
+
+set timing on
+
+select sum(length(object_name)) from t where object_id > :x;
+
+
+
+select * from table(dbms_xplan.display_cursor(null,null,'ALLSTATS LAST'));
+
+pause
+
+exec :x := 1
+
+select sum(length(object_name)) from t where object_id > :x;
+
+
+
+select * from table(dbms_xplan.display_cursor(null,null,'ALLSTATS LAST'));
+
+pause
+
+select sum(length(object_name)) from t where object_id > :x;
+
+
+
+select * from table(dbms_xplan.display_cursor(null,null,'ALLSTATS LAST'));
+