根据需要修改以下红色字体的部分即可。

1、连接集群式数据库DBLINK语法

create public database link 自定义的dblink名字

connect to 连接对方数据库的用户名 identified by "密码"

using '(DESCRIPTION =

(ADDRESS_LIST =

(FAILOVER = ON)

(LOAD_BALANCE = OFF)

(ADDRESS = (PROTOCOL = TCP)(HOST =对方数据库集群服务器1)(PORT = 端口号))

(ADDRESS = (PROTOCOL = TCP)(HOST =对方数据库集群服务器2)(PORT = 端口号))

(ADDRESS = (PROTOCOL = TCP)(HOST =对方数据库集群服务器3)(PORT = 端口号))

(ADDRESS = (PROTOCOL = TCP)(HOST =对方数据库集群服务器4)(PORT = 端口号))

)

(CONNECT_DATA =

(SERVER = DEDICATED)

(FAILOVER_MODE=(TYPE=select)(METHOD=basic))

(INSTANCE_ROLE = ANY)

(SERVICE_NAME = 对方数据库的服务名)))';

2、单机数据库服务器DBLINK语法：

CREATE public   database 自定义的dblink名字

  connect to 连接对方数据库的用户名 identified by "密码"

  using '(DESCRIPTION =

    (ADDRESS_LIST =

      (ADDRESS = (PROTOCOL = TCP)(HOST = 对方数据库服务器 )(PORT = 端口号))

    )

    (CONNECT_DATA =

      (SERVICE_NAME = 对方数据库的服务名))

  )';