Oracle 提供資料庫連結功能，實現從當前資料庫連結到其他資料庫，從當前資料庫操作其他資料庫上的數據。

創建連結

CREATE DATABASE LINK dblinkname CONNECT TO dbuser IDENTIFIED BY your_password USING 'orcl';

CREATE PUBLIC DATABASE LINK 數據鏈名稱 CONNECT TO 登陸用戶名 IDENTIFIED BY 密碼 USING '(DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 對方Oracle伺服器的IP地址)(PORT = 連接埠號)) ) (CONNECT_DATA =(SERVICE_NAME = 對方Oracle伺服器服務名) ))'	
	

查詢

select * from v$dblink;
select * from user_db_links;
select owner, db_link from dba_db_links;
	

刪除連結

drop database link 數據鏈名稱;
	

CREATE DATABASE LINK WEB 
CONNECT TO WEB IDENTIFIED BY 0CfJly7y5YB060Cf5YBCf 
USING 'orcl';

CREATE VIEW ACCOUNT AS SELECT username, password FROM member@WEB;

select * from ACCOUNT where username="netkiller";