源库A： WE8ISO8859P1

目标库B:  ZHS16GBK

 1，源库A上，表test字段value包含汉字，并对表test创建一个视图：

create or replace view v_isotogbk as select id,utl_raw.cast_to_raw(value) value from test;

注：判断是否含有中文

select value from test where asciistr(replace(value ,'\',' '))  like '%\%';

 2，在目标库B上，创建一个dblink

create database link db228 connect to zhong identified by xxxx

using '(DESCRIPTION =(ADDRESS = (PROTOCOL = TCP)(HOST = 119.139.88.228)(PORT = 1521))(CONNECT_DATA =(SERVER = DEDICATED)(SERVICE_NAME = pddb)))';

 3，目标库B上，使用utl_raw.cast_to_varchar2函数创建其对应的视图

create or replace view v_isotogbk as select id, utl_raw.cast_to_varchar2(value) value from v_isotogbk@db228;

 4，如不需要同步，查询上面视图即可，需要同步则可以使用物化视图，并定期刷新

create materialized

view mv

refresh complete on demand

as select id, value from v_isotogbk;