Oracle 数据库跨库同步表有很多种方式可以实现, 比如触发器, Materialized View（MV）, Stream, Goldengate 等
Materialized View(物化视图)是包括一个查询结果的数据库对像, 它是远程数据的的本地副本, 或者用来生成基于数据表求和的汇总表. 物化视图存储基于远程表的数据, 也可以称为快照. 这个基本上就说出了物化视图的本质, 它是一组查询的结果, 这样势必为将来再次需要这组数据时大大提高查询性能.下面就介绍使用 Materialized View + Job 的方式来双向同步表,具体步骤如下:
1. 在源数据库 A 和目标数据库 B 上分别建立 table
create table test
(
id varchar2(10) not null primary key,
name varchar2(20),
status varchar2(1),
updatedate date
)
2. 在数据库上分别建立 dblink
create database link dblink_to_B
connect to "userid" identified by "password"
using '(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = "ipaddress")(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = "SID")
)
)';
create database link dblink_to_A
connect to "userid" identified by "password"
using '(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = "ipaddress")(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = "SID")
)
)';
3. 在源数据库 A 上建立 Materialized View 以及 Materialized view log
create materialized view log on test with rowid
create materialized view mv_test refresh fast on demand with rowid
as select * from test@dblink_to_B