物化视图on prebuilt table

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标题:物化视图on prebuilt table

作者:惜分飞©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]

1、ORA-12059
执行语句:
CREATE MATERIALIZED VIEW mv_t2
on prebuilt TABLE
AS
SELECT * FROM SCOTT.emp
错误提示:
ORA-12059: prebuilt table “CHF”.”MV_T2″ does not exist
错误原因:
物化视图对应的表不存在(物化视图需要和表同名,结构相同)
解决方法:
CREATE TABLE mv_t2 AS
SELECT * FROM scott.emp WHERE 1=0;
2、ORA-23413
执行语句:
CREATE MATERIALIZED VIEW mv_t2
on prebuilt TABLE
WITH REDUCED PRECISION
refresh FAST on demand
AS
SELECT * FROM SCOTT.emp
错误提示:
ORA-23413: table “SCOTT”.”EMP” does not have a materialized view log
错误原因:
使用fast模式刷新物化视图,需要有物化视图日志
解决方法:
1)创建物化视图日志
CREATE MATERIALIZED VIEW LOG ON scott.emp ;
2)刷新模式改为force,其实实质是采用了complete刷新模式
3、ORA-12058
执行语句(mv log是基于rowid,表无主键)
CREATE MATERIALIZED VIEW mv_t2
on prebuilt TABLE
WITH REDUCED PRECISION
refresh FAST on DEMAND
WITH ROWID
AS
SELECT * FROM SCOTT.emp
错误提示:
ORA-12058: materialized view cannot use prebuilt table
错误原因:
fast刷新模式不能基于rowid进行
解决方法:
1)删除mv log,表添加主键,采用基于主键模式重新建mv log和物化视图
DROP MATERIALIZED VIEW mv_t1;
ALTER TABLE mv_t2 ADD PRIMARY KEY (EMPNO);
CREATE MATERIALIZED VIEW LOG ON scott.emp;
CREATE MATERIALIZED VIEW mv_t2
on prebuilt TABLE
WITH REDUCED PRECISION
refresh FAST on DEMAND
–WITH ROWID
AS
SELECT * FROM SCOTT.emp;
2)刷新模式改为force,其实实质是采用了complete刷新模式
4、总结
1)在执行创建物化视图之前,需要先创建同名、同结构表
2)如果使用fast模式刷新(疑惑在线重定义可以通过rowid实现,为什么直接通过物化视图就不可以),物化视图同表需要主键,需要物化视图日志
3)通过drop mv,发现同名表还存在,和on prebuilt table本质区别

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