Oracle-11g 中两库间物化视图的同步

2022-11-17 18:27:25

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运行环境

1.目标端数据库

(1).数据库版本：Oralce-11.2.0.3

(2).IP 地址：11.6.76.222~223

2.源端数据库

(1).数据库版本：Oralce-11.2.0.4

(2).IP 地址：192.168.87.221~222

物化视图同步说明

在源端数据库创建表 TB_MV_TEST1 以及 TB_MV_TEST2，目标端将建立查询以上两表的物化视图，并分别采用增量及全量的方式进行同步。

配置步骤

1.创建测试表（源端）

SQL> CREATE TABLE TB_MV_TEST1 (pkid number, msg varchar2(32));

ALTER TABLE TB_MV_TEST1 ADD CONSTRAINT pk_tb_mv_test1 PRIMARY KEY (pkid);

SQL> CREATE TABLE TB_MV_TEST2 (pkid number, msg varchar2(32));

ALTER TABLE TB_MV_TEST2 ADD CONSTRAINT pk_tb_mv_test2 PRIMARY KEY (pkid);

2.创建物化视图日志（源端）

由于 TB_MV_TEST1 欲采用增量同步方式，所以对其创建物化视图日志。

SQL> CREATE MATERIALIZED VIEW LOG ON tb_mv_test1;

注意：默认情况下将以 with primary key 方式存储物化视图日志。

3.创建 DB LINK（目标端）

SQL> CREATE DATABASE LINK db_test CONNECT TO adm_zsz IDENTIFIED BY "password" USING 'foctestora';

4.创建物化视图（目标端）

SQL> CREATE MATERIALIZED VIEW mv_test1 REFRESH FORCE ON DEMAND WITH PRIMARY KEY AS SELECT * FROM tb_mv_test1@db_test;

SQL> CREATE MATERIALIZED VIEW mv_test2 REFRESH FORCE ON DEMAND WITH PRIMARY KEY AS SELECT * FROM tb_mv_test2@db_test;

5.刷新物化视图（目标端）

SQL> exec dbms_mview.refresh('MV_test1');

SQL> exec dbms_mview.refresh('MV_test2');

注意：因为刷新方式为 FORCE，所以将先尝试使用 FAST 方式刷新物化视图，倘若不符合 FAST 刷新的条件，则采用 COMPLETE 方式刷新。

刷新方式验证

1.新增 MASTER TABLE 数据（源端）

SQL> insert into tb_mv_test1 values (5,'FIVE');

SQL> insert into tb_mv_test2 values (5,'FIVE');

2.查看物化视图日志信息（源端）

SQL> SELECT log_owner, master, log_table, primary_key, last_purge_date,last_purge_status

FROM user_mview_logs;

查询结果如下

由上图可见，表 TB_MV_TEST1 的物化视图日志名称为 MLOG$_TB_MV_TEST1，表 TB_MV_TEST2 并无物化视图日志。

3.查看物化视图日志内容（源端）

SQL> SELECT * FROM MLOG$_TB_MV_TEST1;

查询结果如下

可见新增数据已记录于物化视图日志。

4.刷新物化视图（目标端）

SQL> exec dbms_mview.refresh('MV_test1');

SQL> exec dbms_mview.refresh('MV_test2');

5.查看物化视图刷新方式（目标端）

SQL> SELECT owner, mview_name, last_refresh_type, last_refresh_date, staleness

FROM dba_mviews

查询结果如下

由上图可见 MV_TEST1 采用 FAST 方式刷新，MV_TEST2 采用 COMPLETE 方式刷新。

6.查看物化视图日志内容（源端）

SQL> SELECT * FROM MLOG$_TB_MV_TEST1;

查询结果如下

由上图可见，源端物化视图日志在刷新后，日志内容清空。

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