ORACLE＿远程数据库同步

在本地建立两张表(T1,T2)，这两张表和远程的表结构一样，通过触发器实现数据的同步，然后对本地的两张表进行物化，再在物化视图上建立触发器，实时的修改T表(并没有考虑大字段的情况)。
该方案是测试成功的，源数据库是oracle10.2.0.3.0,目标数据库是oracle10.2.0.3.0,并且做到了数据的实时更新。
1、在源数据库创建database link,确保两台服务器可以连通。
首先在oracle 的E:\oracle\product\10.2.0\db_1\network\ADMIN\tnsnames.ora配置文件里添加远程oracle服务器的实例，具体如下：

SQL code

ORCL103 =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.103)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = orcl)
    )
  )

然后执行创建database link的语句：

SQL code

create database link ORCL103.REGRESS.RDBMS.DEV.US.ORACLE.COM
  connect to CCPPH1
  using 'orcl103';

然后测试是否已连通，在命令窗口输入：
Select count(*) from T1@orcl103;
2、在本地建表(T1, T2),要和源数据库中的表结构一致。

SQL code

--T1表
Create table T1 as select * from T1@orcl103;
alter table T1 add constraint PK_ID primary key (ID);

--T2表
Create table T2 as select * from T2@orcl103;
alter table T2 add constraint PK_ID primary key (ID);

3、在源数据库上分别建立触发器

SQL code

--T1表触发器
create or replace trigger TRI_T1
after insert or update or delete on T1
for each row
begin
if deleting then
      dbms_output.put_line('删除');
      delete from T1@orcl101 where id=:old.id;
end if;
if inserting then
      dbms_output.put_line('插入');
      insert into T1@orcl101(id,name)
      values(:new.id,:new.name);
end if;
if updating then
     dbms_output.put_line('修改');
     update T1@orcl101 set id=:new.id,name=:new.name where id=:old.id;
end if;
end TRI_T1;
--T2表触发器
create or replace trigger TRI_T2
after insert or update or delete on T2
for each row
begin
if deleting then
      dbms_output.put_line('删除');
      delete from T2@orcl101 where id=:old.id;
end if;
if inserting then
      dbms_output.put_line('插入');
      insert into T2@orcl101(id,name)
      values(:new.id,:new.name);
end if;
if updating then
     dbms_output.put_line('修改');
     update T2@orcl101 set id=:new.id,name=:new.name where id=:old.id;
end if;
end TRI_T2;

4、在目标数据库创建物化视图日志

SQL code

--创建物化视图日志
create materialized view log on T1 with rowid;
create materialized view log on T2 with rowid;

5、在目标数据库创建物化视图

SQL code

create materialized view MV_T
refresh fast on commit
as
select t1.rowid as t1rowid,t2.rowid as t2rowid,t1.id,t1.name,t2.id as t2id,t2.name as t2name from T1 t1,T2 t2 where t1.id = t2.id;

6、在目标数据库创建基于物化视图的触发器

SQL code

create or replace trigger TRI_T
after insert or update or delete on mv_T
for each row
begin
if deleting then
      dbms_output.put_line('删除');
      delete from T where ID=:old.ID;
end if;
if inserting then
      dbms_output.put_line('插入');
      insert into T(id,name)
      values(:new.id,:new.name);
end if;
if updating then
      dbms_output.put_line('修改');
     update T set id=:new.id,name=:new.name where id=:old.id;
end if;
end TRI_T;

已完毕，如果数据库的版本不同，有时在执行更新的时候会报内部错误，但是数据确实是已经更新过来了。