Question

我有2张桌子

主键 car_acc_id

car_acc

和

final_cost ，主键 car_acc_id 引用上一个。

我创建了2个日志：

CREATE MATERIALIZED VIEW LOG ON car_acc WITH PRIMARY KEY; 

CREATE MATERIALIZED VIEW LOG ON final_cost WITH PRIMARY KEY ;

我选择PrimaryKey日志来解决ROW ID的导入/导出问题

然后我尝试在这些表上创建MATERIALIZED视图：

CREATE MATERIALIZED VIEW costs
BUILD IMMEDIATE
REFRESH FAST ON demand
AS SELECT ca.car_id, ca.acc_id,f.cost
  FROM car_acc ca,final_cost f
  WHERE ca.car_acc_id=f.car_acc_id;

但有例外：

"cannot fast refresh materialized view %s.%s"
*Cause:    Either ROWIDs of certain tables were missing in the definition or
       the inner table of an outer join did not have UNIQUE constraints on
       join columns.

Answer 1

你很近（并且例外确实记录了问题）。使用关于实例化视图的11g文档，在Materialized Views Containing Only Joins部分中没有聚合，您需要有一个包含rowid的物化视图日志。

因此，我将删除现有的物化视图日志并创建以下物化视图日志，如下所示：

CREATE MATERIALIZED VIEW LOG ON car_acc
WITH ROWID;


CREATE MATERIALIZED VIEW LOG ON final_cost
WITH ROWID;

另外（根据上面提到的链接），您需要在物化视图的select语句中添加rowid，如下所示：

CREATE MATERIALIZED VIEW costs
BUILD IMMEDIATE
REFRESH FAST ON demand
AS SELECT 
ca.rowid car_rid, f.rowid f_rowid,
ca.car_id, ca.acc_id,f.cost
  FROM car_acc ca,final_cost f
  WHERE ca.car_acc_id=f.car_acc_id;

快速刷新具有基于主键的日志的物化视图

1 个答案: