物化视图与嵌套表

Question

我有以下类型：

create or replace type varchar2_arr as table of varchar2(300) 

我尝试创建物化视图：

create table a (id varchar2(10), data varchar2(200), constraint pk_a primary key(id)); 
create table b (id varchar2(10), data varchar2(200), constraint pk_b primary key(id)); 

create materialized view log on a with rowid; 
create materialized view log on b with rowid; 

create materialized view mnest_ab_mv 
refresh fast on commit 
as 
select a.rowid a_rowid, b.rowid b_rowid, varchar2_arr(a.data), b.data 
from a, b 
where a.id = b.id (+) 

甲骨文给了我以下错误：

ORA-12054: cannot set the ON COMMIT refresh attribute for the materialized view 

什么我需要做一个嵌套表创建物化视图？

Answer 1

您是否尝试过运行DBMS_MVIEW.EXPLAIN_MVIEW过程，其输出可能有所帮助。

感谢

Vishad