刷新嵌套物化视图时如何捕获错误

Question

实体化视图"MV_AMP":

CREATE MATERIALIZED VIEW MV_AMP
  NOLOGGING
  BUILD IMMEDIATE
  REFRESH FORCE
  ON DEMAND
AS
Select a, b, c from amp;

实体化视图 "MV_BOT" 依赖于 "MV_AMP":

CREATE MATERIALIZED VIEW MV_BOT
  NOLOGGING
  BUILD IMMEDIATE
  REFRESH FORCE
  ON DEMAND
AS
SELECT bot.x, bot.y, mv_amp 
FROM bot, mv_amp
WHERE bot.a = mv_amp.a;

并在mv_bot中创建唯一索引：

CREATE UNIQUE INDEX mv_bot_idx001 ON mv_bot(x, a);

视图和索引创建成功后，假设我添加了一个重复值，导致在刷新 mv_bot 时由于唯一索引而导致类似 (dup_val_on_index) 的错误。

所以我使用 nested=TRUE 在 MV_AMP（主视图）中进行了刷新，Oracle 没有引发错误：

BEGIN
  dbms_mview.refresh_dependent(number_of_failures => n_failures,
                                   list => 'MV_AMP',
                                   atomic_refresh => TRUE,
                                   nested => TRUE);

EXCEPTION
  WHEN
    OTHERS THEN
        -- it never reach this code
        dbms_output.put_line('Errors: '||SQLERRM);
END;

n_failures returns: 0 并且它永远不会到达异常内的 dbms_output。

我需要在 oracle 尝试更新嵌套 MV 并登录 table 时捕获错误。

使用 Oracle 11g。

Answer 1

只有在实体化视图中存在重复行的情况下才会到达 EXCEPTION 块 MV_BOT - 事实并非如此。

你可能会问为什么；最有可能的答案是您还需要刷新物化视图MV_AMP， 才能在 MV_BOT.

的连接中获取 dup

在阅读 dbms_mview.refresh_dependent 的文档时您意识到，您必须从 table AMP 开始才能刷新两个 MV（从 MV_AMP 开始仅刷新依赖MV MV_BOT)

测试用例

create table amp (
a number,
b number,
c number);

create table bot (
a number,
x number,
y number);

CREATE MATERIALIZED VIEW MV_AMP
  NOLOGGING
  BUILD IMMEDIATE
  REFRESH FORCE
  ON DEMAND
AS
Select a, b, c from amp;

CREATE MATERIALIZED VIEW MV_BOT
  NOLOGGING
  BUILD IMMEDIATE
  REFRESH FORCE
  ON DEMAND
AS
SELECT bot.x, bot.y, mv_amp.a 
FROM bot, mv_amp
WHERE bot.a = mv_amp.a;

CREATE UNIQUE INDEX mv_bot_idx001 ON mv_bot(x, a);

insert into amp(a,b,c) values(1,1,1);
insert into bot(a,x,y) values(1,1,1);
insert into bot(a,x,y) values(1,1,3);
commit;

DECLARE
  n_failures NUMBER;
BEGIN
  dbms_mview.refresh_dependent(number_of_failures => n_failures,
                                   list => 'AMP',
                                   atomic_refresh => TRUE,
                                   nested => TRUE);
   dbms_output.put_line('Failures: '||n_failures);                                                                
EXCEPTION
  WHEN
    OTHERS THEN
        dbms_output.put_line('Errors: '||SQLERRM);
END;
/

--> Errors: ORA-12008: error in materialized view refresh path
--> ORA-00001: unique constraint (xxxxx.MV_BOT_IDX001) violated

刷新嵌套物化视图时如何捕获错误

How to catch errors when refresh nested materialized views

oracle

materialized-views