Oracle使用dblink实现跨库访问的实例代码

grant create public database link,create database link to BOSS823;

CREATE [SHARED] [PUBLIC] database link link_name
　　[CONNECT TO [user] [current_user] IDENTIFIED BY [password]　
　　[AUTHENTICATED BY user IDENTIFIED BY password]　
　　[USING 'connect_string']

create database link dblink821
  connect to BOSS821T identified by BOSS821
  using '10.0.192.36_STARSMS';

SQL> select * from dba_db_links;
 
OWNER                          DB_LINK                                                                          USERNAME                       HOST                                                                             CREATED
------------------------------ -------------------------------------------------------------------------------- ------------------------------ -------------------------------------------------------------------------------- -----------
BOSS823                        DBLINK821.REGRESS.RDBMS.DEV.US.ORACLE.COM                                        BOSS821T                       10.0.192.36_STARSMS                                                              2024/3/6 17
 
SQL> 

DROP database link link_name;

select * from BOSS821T.CUSTOMEREN @dblink821

SQL> select COUNT(*) from BOSS821T.CUSTOMEREN @dblink821T;
 
  COUNT(*)
----------
    171736
 
SQL> create table CUSTOMER821T as select * from BOSS821T.CUSTOMEREN @dblink821T;
 
Table created
 
SQL> 
 
执行时间：3.089秒

--ORA-01017: invalid username/password; logon denied 
--ORA-02063: preceding line from <link_name>

 
 
--查看当前数据库的版本
SQL> select * from v$version;
 
BANNER
----------------------------------------------------------------
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - Prod
PL/SQL Release 10.2.0.3.0 - Production
CORE    10.2.0.3.0    Production
TNS for 32-bit Windows: Version 10.2.0.3.0 - Production
NLSRTL Version 10.2.0.3.0 - Production
 
 
--查看链接到数据库的版本
SQL> select * from v$version;
 
BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
PL/SQL Release 11.2.0.4.0 - Production
CORE    11.2.0.4.0    Production
TNS for Linux: Version 11.2.0.4.0 - Production
NLSRTL Version 11.2.0.4.0 - Production

-- Create database link 
create database link dblink821T
  connect to BOSS821T identified by "boss821T"
  using '10.0.192.36_STARSMS';