Oracle创建索引

索引创建分两种，自动和手动

*.自动创建索引（由主键或唯一键约束创建）:

create table e as select * from emp;

select index_name from user_indexes where table_name='E'; --查看索引

alter table e add constraint pk_e_empno primary key (empno);

alter table e add constraint uk_e_ename unique(ename);

*.手工创建

create index i_e_job on e (job);

create index i_e_2 on e (empno,job,sal);

select index_name,table_name,column_name from user_ind_columns;

*.删除索引:

drop index i_e_ename;

*.重建索引:

alter index i_e_ename rebuild;

alter index i_e_ename rebuild online;