記憶-oracle-執行計劃查看

1 數據創建 

create table test_index(id int primary key,v int )
create index test_index_v_desc on test_index(v)

2 數據輸入

declare 
a int:=0;
begin
  while (a < 100) loop
    insert into test_index(id,v) values(a,a);
    a:=a+1;
    end loop;
end;

3 執行計劃查看

3.1.計劃：全表查詢

explain plan for
select * from test_index 

select * from table(dbms_xplan.display)

 3.2.計劃：使用索引

explain plan for
select * from test_index where v=100

 

select * from table(dbms_xplan.display)