2026-03-12 20:23:15

tpt/demos/fetch.sql

@@ -0,0 +1,66 @@
+-- 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/fetch.sql "<SQL to execute>"
+--
+-- Purpose:     Advanced Oracle Troubleshooting Seminar demo script
+--
+--              Shows effect of arraysize to fetch lengths and 
+--              in which execution/fetching stage data access work is done              
+--
+-- Author:      Tanel Poder ( http://www.tanelpoder.com )
+--
+-- Copyright:   (c) 2007-2009 Tanel Poder
+--
+--------------------------------------------------------------------------------
+
+set termout off
+
+drop table t;
+
+create table t as 
+select 
+   rownum a
+ , CAST(rownum as CHAR(2000)) b 
+from 
+   dual 
+connect by 
+   level <= 50
+/
+
+create index i on t(a);
+
+exec dbms_stats.gather_table_stats(user, 'T');
+
+--set arraysize 5
+
+col fetch_command new_value fetch_command
+
+select replace(replace(replace('&1', '*', '\*'),'/','\/'),'>','\>') fetch_command from dual; 
+
+-- hard parse
+clear buffer
+1 &1
+/
+
+alter session set sql_trace=true;
+
+@ti
+set termout off
+
+clear buffer
+1 &1
+/
+
+set termout on
+
+prompt TRACE OUTPUT:
+prompt _________________________________
+prompt
+
+host "grep -A 99999 -B1 '&fetch_command' &trc | sed -e '/&fetch_command/p;/PARS/p;/EXEC/p;/FETCH/p;d'"
+
+--select * from table(dbms_xplan.display_cursor(null,null, 'ALLSTATS LAST'));
+