1.檢視dblink

sys使用者執行：

select * from dba_db_links;

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

2.建立dblink

使用者授權：

建立dblink的使用者必須有對應的資料庫許可權create public database link 或者create database link

 select * from session_privs ;
 select * from user_sys_privs; 

【若無許可權，執行：grantcreate

建立dblink語句：
create database link dblinkname connect to touser identified by pwd  using '(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME =orcl)
)
)';        

3.dblink查詢

select * from

4.刪除dblink

    drop database link dblinkname;