Oracle物化視圖

Question

根據oracle文檔，我們不能使用快速刷新方法來刷新聚合物化視圖。 我在Oracle文檔中找到了這個例子： 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;

每次我試圖使用聚合和快速刷新彼此我得到錯誤。
在使用快速刷新和聚合功能的情況下是否有任何特殊提示？

親切的問候

Answer 1

根據我的調查，為了使用聚合函數和快速刷新方法創建MV，您的MV和MV日志應該具有特殊結構，以便在腳本下方查看正確的MV和MV日志結構：

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;

然后執行以下查詢以查看MV和MV日志的所需結構：

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