oracle 远程连接查询的两种连接方法

一、本地配置数据库实名配置远程连接

1  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) 
    ) 
  )';