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  • oracle dblink使用

    1、查看dblink:

    select * from dba_db_links

    2、创建dblink的用户需要有创建dblink的权限,授权语句:(public是可选的)

    grant create [public] database link to myAccount;

    3、创建语句:

    create public database link dblinkname 
    connect to username identified by password
         using '(DESCRIPTION =(ADDRESS_LIST =(ADDRESS = (PROTOCOL = TCP)(HOST = database_ip)(PORT = 1521)))
                                (CONNECT_DATA =(SERVICE_NAME =servicename))
                   )';

     加上faliover等参数的情况:

    create database link MCITY_DBLINK 
       connect to fsr identified by fsr 
       using '(DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = database_ip)(PORT = 1521))
                                               (ADDRESS = (PROTOCOL = TCP)(HOST = database_ip)(PORT = 1521))
                                               (FAILOVER=yes) (LOAD_BALANCE =off))
                               (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = service_name))
                               (FAILOVER_MODE = (TYPE = SELECT) (METHOD = BASIC)(RETIRES = 10) (DELAY = 15))
                )';

    4、使用dblink:

       (1)直接查询:

    select * from table@dblinkname

     table为远程目标数据库username下的表名

      (2)在本地创建同义词:

    create or replace synonym synonymname table@dblinkname
    synonymname是要创建的同义词名称,table为远程目标数据库username下的表名
    然后用同义词查询:
    select * from synonymname

      效果跟(1)一样

    5、删除dblink和synonym:(public是可选的)

    drop [public] database link dblinkname;
    drop [public] synonym table_name;
     

       

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  • 原文地址:https://www.cnblogs.com/charles-dxb/p/3333067.html
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