千家信息网

Oracle 使用物化视图实现表数据同步

发表于:2025-01-21 作者:千家信息网编辑
千家信息网最后更新 2025年01月21日,1.创建原表和物化视图日志SQL> create table t1(id int,name varchar2(30));Table created.SQL> alter table t1 add co
千家信息网最后更新 2025年01月21日Oracle 使用物化视图实现表数据同步

1.创建原表和物化视图日志

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
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
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
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 4SQL> 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 x1234SQL> 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

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 WITHSQL> select staleness from user_mviews;STALENESS-------------------COMPILATION_ERROR



0