44 lines
1.2 KiB
MySQL
44 lines
1.2 KiB
MySQL
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-- Author: Alberto Dell'Era
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-- Copyright: (c) 2008-2012 Alberto Dell'Era http://www.adellera.it
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--------------------------------------------------------------------------------
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set echo on
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set trimspool on
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/*
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drop table t;
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create table t (x int, y int);
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create index t_x_idx on t(x);
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insert into t(x,y) select rownum, rownum from dual connect by level <= 10000;
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commit;
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exec dbms_stats.gather_table_stats(user, 'T', cascade=>true, method_opt=>'for all columns size 1', estimate_percent=>null);
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*/
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--alter system flush shared_pool;
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alter system flush buffer_cache;
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alter session set statistics_level=all;
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select /*+ index(t,t_x_idx) xplan_test_marker */ t.y, (select y from t t2 where t2.x = t.x) from t where x > 0;
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select /*+ leading(t2) use_nl(t1,t2) index(t2,t_x_idx) xplan_test_marker */ t1.*, t2.*
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from t t1, t t2
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where t1.x = t2.x
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and t1.y <= 1000;
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update /*+ xplan_test_marker */ t set x = x;
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rollback;
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set autotrace traceonly statistics
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insert /*+ append xplan_test_marker */ into t select rownum-1, rownum-1 from dual connect by level <= 100000;
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rollback;
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set autotrace off
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@xplan "%xplan_test_marker%" "ti=n,oi=n,plan_details=y"
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