Oracle物化视图

grant create materialized view,query rewrite to scott

set autotrace trace exp查看执行计划

show parameter

创建物化视图：

create materialized view mt
build immediate
refresh on demand
enable query rewrite
as
select d.deptno,d.dname,sum(e.sal)
from emp e,dept d
where e.deptno=d.deptno
group by d.deptno,d.dname;

exec dbms_mview.refresh('mt');
oracle执行计划