oracle---DBLink

本机:192.168.0.1
远程主机：192.168.0.2

(1)在本机上tnsnames.ora配置如下

ORCL_2 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.2)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = orcl)
)
)

(2)在本机上创建数据库连接

CREATE DATABASE LINK link
CONNECT TO backup IDENTIFIED BY backup
USING 'ORCL_2';

注意: backup为192.168.0.2上的用户，密码为backup

###查看存在数据库连接

select owner,object_name from dba_objects where object_type='DATABASE LINK';

(3)测试

SELECT * FROM hada.hada@link;

####删除数据库连接

DROP  DATABASE LINK link;

创建公共连接

CREATE PUBLIC DATABASE LINK link3
CONNECT TO backup IDENTIFIED BY backup USING 'ORCL_2'
;

public是全局dblink,即该数据库上所有用户都能查询,要sys或者system用户来创建(当然有sysdba权限的用户也可以的);如果不使用public就是私有dblink,只有创建该dblink的用户能查询查看连接是否成功.

SELECT * FROM backup.l@link3;
SELECT * FROM hada.hada@link3;

###删除公共连接
DROP  PUBLIC　DATABASE LINK LINK3;