dblink的使用

1.建立全局link(使用本地一個用戶訪問其它用戶的表)

語法:

create public database link 連接名  CONNECT TO 本地用戶名 IDENTIFIED BY 密碼 USING '本地數據庫實例名';

SQL> create user upch identified by System13579;         
User created.
SQL> grant dba,resource,connect to upch;
Grant succeeded.

SQL> conn upch/System13579
Connected.

SQL> create table t (a number);
Table created.

SQL> insert into t values(1);
1 row created.
SQL> insert into t values(2);
1 row created.
SQL> select * from t;
     A
----------
     1
     2
SQL> conn / as sysdba
Connected.

SQL> create public database link tong connect to upch identified by System13579 using 'orcl';

SQL> select * from t@tong;    --訪問upch用戶下的t表
     A
----------
     1
     2
SQL>

2.遠程建立link

語法:

create /* public */ database link tong connect to 遠程用戶名 identified by 密碼using '(DESCRIPTION =(ADDRESS_LIST =(ADDRESS =(PROTOCOL = TCP)(HOST = 遠程IP地址)(PORT = 1521)))(CONNECT_DATA =(SERVICE_NAME = 遠程SID值)))'; 

[oracle@localhost dbs]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.3.0 Production on Wed Jun 28 14:47:53 2017
Copyright (c) 1982, 2011, Oracle.  All rights reserved.

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> create database link tong1 connect to upch identified by System13579 using '(DESCRIPTION =(ADDRESS_LIST =(ADDRESS =(PROTOCOL = TCP)(HOST = 172.16.8.161)(PORT = 1521)))(CONNECT_DATA =(SERVICE_NAME = orcl)))';
Database link created.
SQL> select * from t@tong1;
     A
----------
     1
     2
SQL> col owner for a10

SQL> col db_link for a10

SQL> col host for a150

SQL> select * from dba_db_links;        --查看數據庫有多少dblinkOWNER  DB_LINK  USERNAME     HOST       CREATEDSYS    TONG1    UPCH      (DESCRIPTION =(ADDRESS_LIST =(ADDRESS =(PROTOCOL = TCP)(HOST = 172.16.8.161)(PORT = 1521)))(CONNECT_DATA =(SERVICE_NAME = orcl)))            28-JUN-17SQL> drop database link tong1;            --刪除dblinkDatabase link dropped.SQL>