1、--创建自动刷新的物化视图 -基表发生commit操作,自动刷新物化视图 create materialized view mv_address2 refresh on commit as select ,, arname from t_address ad,t_area ar where ad.areaid= 2、--向基表插入数据 insert into t_address values(10,'西5旗',2,2); commit; 3、--查询物化视图 select * from mv_address2; 1. 2. 3. ...
刚看了一下10g的快速刷新限制条件，明确说明了包含分析函数的物化视图是无法快速刷新的：General Restrictions on Fast Refresh The defining query of the materialized view is restricted as follows:The materialized view must not contain references to non-repeating expressions like SYSDATE and ROWNUM....
CREATE MATERIALIZED VIEW mv_employee_on_commit REFRESH FORCE ON COMMIT AS SELECT employee_id, first_name, last_name, department_id FROM employees; 在这个示例中,mv_employee_on_commit是一个物化视图,它从employees表中选择了几个字段。REFRESH FORCE ON COMMIT子句指定了物化视图在基表employees提交事务时...
SQL> create materialized view mv_name refresh force on demand start with sysdate next to_date( concat( to_char( sysdate+1,'dd-mm-yyyy'),' 22:00:00'),'dd-mm-yyyy hh24:mi:ss'); 3、ON COMMIT物化视图ON COMMIT物化视图的创建,和上面创建ON DEMAND的物化视图区别不大。因为ON DEMAND是默认的...
on commit:一旦基表有了commit,即事务提交,则立刻刷新,立刻更新物化视图,使得数据和基表一致。 二、创建定时刷新的物化视图(每天晚上10点刷新): reate materialized view vi_emp refresh force on demand start with to_date('03-02-2012 14:50:59','dd-mm-yyyy hh24:mi:ss') next to_date(concat(to_...
ON COMMIT物化视图的创建,和上面创建ON DEMAND的物化视图区别不大。因为ON DEMAND是默认的,所以ON COMMIT物化视图,需要再增加个参数即可。 需要注意的是,无法在定义时仅指定ON COMMIT,还得附带个参数才行。 创建ON COMMIT物化视图:create materialized view mv_name refresh force on commit as select * from table...
ON DEMAND物化视图的特性及其和ON COMMIT物化视图的区别,即前者不刷新(手工或自动)就不更新物化视图,而后者不刷新也会更新物化视图,——只要基表发生了COMMIT。 创建定时刷新的物化视图: create materialized view mv_name refresh force on demand start with sysdate next sysdate+1 (指定物化视图每天刷新一次) 上述...
物化视图建立的时候可以定义刷新方式，一般有： refresh fast 和 refresh complete之分，前者是只更新主表中变化的记录(主表必须建立materialized view log)，而后者是把MV里面的数据全部更新。此外，更新方式还可以有：on demand, on commit, on force之分. on commit是及时更新。其实用户创建materialized...
CREATEMATERIALIZEDVIEWLOGONt3WITHROWID,SEQUENCE(id,c1,c2) INCLUDINGNEWVALUES; 物化视图中不包含列计算 首先创建的物化视图如下: 1 2 3 4 5 6 7 8 9 10 CREATEMATERIALIZED VIEW mv1 BUILDIMMEDIATE REFRESHFASTONCOMMIT WITHROWID AS SELECTa.id aid,a.c1ac1,a.c2ac2,b.c1bc1,b.c2bc2, ...
Connected.17:15:32SCOTT@zkm(27)>creatematerializedviewscott.mv_emp17:15:332REFRESH forceoncommit17:15:333as17:15:334select*fromscott.emp; Materializedviewcreated. Elapsed:00:00:00.5517:15:34SCOTT@zkm(27)>begin17:16:062foriin1..10000loop17:16:063updatescott.empsetsal=9999whereempno=7934;17...