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2016-06-23

程式碼清單3-1

create table scott.t1 as

select trunc((rownum - 1) / 100) id,

           rpad(rownum,100) t_pad

from dba_source

where rownum <= 10000;

create index t1_idx1 on t1(id);

exec dbms_stats.gather_table_stats(user,'t1',method_opt=>'FOR ALL COLUMNS SIZE 1',cascade=>true);

drop table t2;

create table scott.t2 as

select mod(rownum,100) id,

           rpad(rownum,100) t_pad

from dba_source

where rownum <=10000;

create index t2_idx1 on t2(id);

exec dbms_stats.gather_table_stats(user,'t2',method_opt=>'FOR ALL COLUMNS SIZE 1',cascade=>true);

select count(*) ct from t1 where id = 1 ;

select count(*) ct from t2 where id = 1 ;

select table_name,num_rows,blocks from user_tables where table_name = 'T2';