物化视图操刀案例

select * from TB1 t for update;

select * from tb2;

查询物化视图日志：如果指定commit，则表被自动清空。

select * from mlog$_tb1;

select * from mlog$_TB2;

删除物化视图日志

drop materialized view log on tb2;

drop materialized view log on TB1;--删除物化视图日志

手动刷新物化视图 ，没有on commit需要手动

SQL> exec dbms_mview.refresh('MV_FAST_TB');

PL/SQL procedure successfully completed

创建物化视图日志：--rowid

create materialized view log on TB1 tablespace ice with rowid; --依据主键创建物化视图日志

create materialized view log on TB2 tablespace ice with rowid; --依据主键创建物化视图日志

创建物化视图：

create materialized view mv_fast_tb tablespace ice refresh fast as

select distinct a.id,a.name,a.rowid a_rowid,b.rowid b_rowid

from TB1 a,TB2 b

where a.id = b.id(+)

创建物化视图索引：

create index ix_mv_id on mv_fast_tb(id);

select * from all_indexes a where a.INDEX_NAME='IX_MV_ID'

分组例子：分组需要指定sequence

create materialized view log on TB1 tablespace ice with rowid ,sequence (id)

; --依据主键创建物化视图日志

create materialized view log on TB2 tablespace ice with rowid, sequence (id)--依据主键创建物化视图日志

create materialized view mv_fast_tb tablespace ice refresh force as

select a.id,count(*)

from TB1 a,TB2 b

where a.id = b.id(+)

group by a.id

或：

create materialized view mv_fast_tb tablespace ice refresh force on commit as

select a.id,count(*)

from TB1 a,TB2 b

where a.id = b.id(+)

group by a.id---也可以是其他字段