Oracle物化视图

Question

根据oracle文档，不能使用快速刷新方法刷新聚合物化视图。我在Oracle中找到了这个例子：6002.htm

CREATE MATERIALIZED VIEW LOG ON times
   WITH ROWID, SEQUENCE (time_id, calendar_year)
   INCLUDING NEW VALUES;

CREATE MATERIALIZED VIEW LOG ON products
   WITH ROWID, SEQUENCE (prod_id)
   INCLUDING NEW VALUES;

CREATE MATERIALIZED VIEW sales_mv 
   BUILD IMMEDIATE 
   REFRESH FAST ON COMMIT 
   AS  
   SELECT t.calendar_year, p.prod_id, 
      SUM(s.amount_sold) AS sum_sales
       FROM times t, products p, sales s
      WHERE t.time_id = s.time_id AND p.prod_id = s.prod_id
      GROUP BY t.calendar_year, p.prod_id;

每次尝试使用聚合和快速刷新时，我都会出错。

在使用快速刷新和聚合功能时，有什么特别的提示吗？

亲切的问候

Answer 1

根据我的调查，为了创建具有聚合功能和快速刷新方法的MV，您的MV和MV日志应该具有特殊的结构，以便查看在脚本下面运行的MV和MV日志的正确结构：

begin
 dbms_advisor.tune_mview(task_name=>:t,
 mv_create_stmt=>'create materialized view mv1 refresh fast 
as select job,sum(sal)    from emp group by job');
end;

然后执行下面的查询，查看MV和MV日志所需的结构：

select  dbms_lob.substr( statement, 4000, 1 ), statement from user_tune_mview
where task_name='TASK_2042' order by action_id;