学步园

一、本地配置数据库实名配置远程连接

 语法： 创建：CREATE DATABASE LINK 数据库链接名 CONNECT TO 用户名 IDENTIFIED BY 密码 USING '本地配置的数据的实例名'； 删除：drop DATABASE LINK 数据库连接名； 例子： 创建：CREATE DATABASE LINK xiongminLink CONNECT TO epossdb IDENTIFIED BY eposseposs USING 'eposs'; 删除：drop DATABASE LINK xiongminLink; 用远程连接查询数据库查询： select * from area@xiongminLink; 

二、不依赖本地配置连接的远程连接查询

语法：  
  create  database link 连接名   
  connect to 用户名 identified by 密码   
  using '(DESCRIPTION =   
    (ADDRESS_LIST =   
      (ADDRESS = (PROTOCOL = TCP)(HOST = 数据库ip)(PORT = 端口))   
    )   
    (CONNECT_DATA =   
      (SERVICE_NAME = 数据库实例名)   
    )   
  )';   
创建：  
   create  database link linkTest   
  connect to epossdb identified by eposseposs   
  using '(DESCRIPTION =   
    (ADDRESS_LIST =   
      (ADDRESS = (PROTOCOL = TCP)(HOST = 10.70.32.76)(PORT = 1521))   
    )   
    (CONNECT_DATA =   
      (SERVICE_NAME = ORCL)   
    )   
  )';