在pl/sql 里实现index 索引 效果

-------INDEX---------

create table tb_tttt(

tid number,

tname nvarchar2(30),

tnum number

);

create sequence seq_tt

start with 1

increment by 1

maxvalue 999999

minvalue 1

cache 10;

begin

for n in 2..99999 loop

insert into tb_tttt values(seq_tt.nextval,'aaa',123);

end loop;

end;

create index tt_index on tb_tttt(tid) tablespace users;

drop index tt_index;

declare

nname nvarchar2(30);

begin

for n in 1..99429 loop

select tname into nname from tb_tttt where tid=99429;

end loop;

end;

分别两次查询，一是带索引的，一是没有索引的