database link远程链接数据库

--授权创建、删除dblink
GRANT CREATE [PUBLIC] DATABASE LINK，DROP [PUBLIC] DATABASE LINK TO canco;

--查看数据库GLOBAL_NAME(数据库名)
SELECT * FROM GLOBAL_NAME;    
    
--查看有哪些dblink
select owner,object_name from dba_objects where object_type='DATABASE LINK';
    
--删除dblink
DROP [public] DATABASE LINK nbcb;    
    
--==================================================================================================================
    
--创建dblink
create database link local218
  connect to CANCO identified by "123"
  using '(DESCRIPTION=(ADDRESS_LIST=(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.218)(PORT = 1521)))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=nbcb)))';

--创建同义词(隐藏链接的数据库)
create synonym nbcb_fa_monthout_t for nbcb_fa_monthout_t@local218;
  
--==================================================================================================================  
 --truncate 语句无法执行
 
--1、在目标数据库中创建过程
    create or replace procedure Remote_ExecuteDDL(sqltext in varchar2)
    authid current_user as
    begin
    execute immediate sqltext;
    end Remote_ExecuteDDL;
--2、传递需要执行的sql
    Remote_ExecuteDDL@local218('truncate table canco.nbcb_fa_monthout_t');
    
--==================================================================================================================

 

--关闭database link连接的两种方式
1、alter session close database link local218;

    2、dbms_session.close_database_link('local218');


--====================================================================================================

 

总之，在使用DBLINK时一定要注意session的回收，在应用程序中使用

commit;

alter session close database link <dalink_name>;

 

execute immediate 'alter session close database link local218';

 

转载于:https://www.cnblogs.com/gavenQin/p/5650945.html