67 lines
1.5 KiB
MySQL
67 lines
1.5 KiB
MySQL
-- Copyright 2018 Tanel Poder. All rights reserved. More info at http://tanelpoder.com
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-- Licensed under the Apache License, Version 2.0. See LICENSE.txt for terms & conditions.
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--------------------------------------------------------------------------------
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--
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-- File name: demos/fetch.sql "<SQL to execute>"
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--
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-- Purpose: Advanced Oracle Troubleshooting Seminar demo script
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--
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-- Shows effect of arraysize to fetch lengths and
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-- in which execution/fetching stage data access work is done
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--
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-- Author: Tanel Poder ( http://www.tanelpoder.com )
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--
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-- Copyright: (c) 2007-2009 Tanel Poder
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--
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--------------------------------------------------------------------------------
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set termout off
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drop table t;
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create table t as
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select
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rownum a
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, CAST(rownum as CHAR(2000)) b
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from
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dual
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connect by
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level <= 50
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/
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create index i on t(a);
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exec dbms_stats.gather_table_stats(user, 'T');
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--set arraysize 5
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col fetch_command new_value fetch_command
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select replace(replace(replace('&1', '*', '\*'),'/','\/'),'>','\>') fetch_command from dual;
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-- hard parse
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clear buffer
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1 &1
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/
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alter session set sql_trace=true;
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@ti
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set termout off
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clear buffer
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1 &1
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/
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set termout on
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prompt TRACE OUTPUT:
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prompt _________________________________
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prompt
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host "grep -A 99999 -B1 '&fetch_command' &trc | sed -e '/&fetch_command/p;/PARS/p;/EXEC/p;/FETCH/p;d'"
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--select * from table(dbms_xplan.display_cursor(null,null, 'ALLSTATS LAST'));
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