Question

根据oracle文档，我们不能使用快速刷新方法来刷新聚合物化视图。我在Oracle文档中找到了这个例子： http://docs.oracle.com/cd/B19306_01/server.102/b14200/statements_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;

每次我尝试使用聚合并快速刷新彼此时我都会收到错误。
在使用快速刷新和聚合功能的情况下是否有任何特殊提示？

亲切的问候

Answer 1

根据我的调查，用于创建具有聚合功能和快速刷新方法的MV，你的MV 和MV日志应该有特殊的结构，以便在脚本下面看到正确的MV和MV日志结构：

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;

然后执行以下查询以查看MV和MV日志的所需结构：

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

Oracle物化视图

1 个答案: