创建database link

 

 

 

 

create database link linkName connect to 数据库名  identified by 密码 using
'(DESCRIPTION =(ADDRESS_LIST =(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.60)(PORT = 1521)))
 (CONNECT_DATA =(SERVICE_NAME = orcl)))';

 

 

查询select * from tablename@linkName;

 

 

 

注意:你必须有CREATE DATABASE LINK或CREATE PUBLIC DATABASE LINK的权限,另外,在你要连接的数据库上,你必须有CREATE SESSION的权限.

语法解释:
    dblink:以后在sql语句中使用的连接名, 在init.ora文件中,如果GLOBAL_NAMES=true,则这个dblink必须与数据库全局名(SELECT * FROM GLOBAL_NAME;)相同.为了方便,可以ALTER SYSTEM SET GLOBAL_NAMES=FALSE;
    user和password:要连接的数据库的合法用户名和密码
    connect_string:可以是经过Net Configuration Assistant配置的(tnsnames.ora)且经测试可以连接的别名,例如:orcl123,不过容易出问题,老提示出错:无法解析字符串.最好写成这种形式 (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.78)(PORT = 1521)) ) (CONNECT_DATA = (SERVICE_NAME = orcl) ) )