简单的介绍oracle的dblink和synonym的创建、删除及使用
-- 授权给scott
grant create any database link to scott
grant create public database link to scott
grant drop database link to scott
grant drop public database link to scott

-- 创建公共的dblink
create public database link test_public
connect to scott identified by scott
using 'ORCL';
--配置的字符串(注意host(ip) 和 orcl(实例名))
create public database link test_public
connect to scott identified by scott
?using '(DESCRIPTION =
　　 (ADDRESS_LIST =
　　 (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
　　 )
　　 (CONNECT_DATA =
　　 (SERVICE_NAME = ORCL)
　　 )
　　 )';

-- 创建私有的dblink
create database link test
connect to scott identified by scott
using 'ORCL';

-- 删除公共的dblink
drop public database link test_public

-- 删除私有的dblink
drop database link test

-- 授权给scott
grant create any synonym to scott
grant create public synonym to scott
grant drop synonym to scott
grant drop public synonym to scott

-- 创建公共的同义词
create public synonym test_public
for emp;
create public synonym test_public
for emp@test_public;

-- 创建私有的同义词
create synonym test
for emp;
create synonym test
for emp@test_public;

-- 删除公共的synonym
drop public synonym test_public

-- 删除私有的synonym
drop synonym test

-- 使用(dblink,synonym)
select * from emp@test_public;
select * from emp@test;

select * from test_public;
select * from test;

参考网址:http://dev.yesky.com/137/7513137.shtml