Oracle 使用物化视图实现表数据同步

gfgregre

1.创建原表和物化视图日志

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SQL> create table t1(id int,name varchar2(30)); Table created. SQL> alter table t1 add constraint pk_t1 primary key(id) using index; Table altered. SQL> create materialized view log on t1 with primary key; Materialized view log created.

2.创建目标表和物化视图
这里我创建是refresh fast on commit类型的物化视图

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SQL> create table t2 as select * from t1 where 1=2; Table created. SQL> create materialized view t2 on prebuilt table refresh fast on commit as select * from t1; Materialized view created.

3.简单测试
在t1插入一条数据，一提交t2即存在数据

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SQL> insert into t1 values(1,'A'); 1 row created. SQL> commit; Commit complete. SQL> select * from t2; ID NAME ---------- ------------------------------ 1 A

4.ddl测试
通过测试我们发现物化视图不支持ddl语句
我们给t1添加一个列和rename一个列

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SQL> alter table t1 add ddl_test int; Table altered. SQL> alter table t1 rename column name to names; Table altered. SQL> select * from t2; ID NAME ---------- ------------------------------ 1 A 2 4 SQL> insert into t1 values(3,'x',1234); 1 row created. SQL> commit; Commit complete. SQL> select * from t1; ID NAMES    DDL_TEST ---------- ------------------------------ ---------- 1 A 2 4 3 x1234 SQL> select * from t2; ID NAME ---------- ------------------------------ 1 A 2 4

发现数据没有过来，我们看一下物化视图的定义和状态

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SQL> select dbms_metadata.get_ddl('MATERIALIZED_VIEW','T2') from dual; DBMS_METADATA.GET_DDL('MATERIALIZED_VIEW','T2') --------------------------------------------------------------------------------   CREATE MATERIALIZED VIEW "SCOTT"."T2" ("ID", "NAME")   ON PREBUILT TABLE WITH SQL> select staleness from user_mviews; STALENESS ------------------- COMPILATION_ERROR