1.创建dblink第一种方法，是在本地数据库tnsnames.ora文件中配置了要远程访问的数据库。
1.设置监听：
①[root@host02 ~]# vi /etc/hosts
添加：【IP和名字】
192.168.206.2 host02
②vi listener.ora：
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = host02)(PORT = 1521))
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
)
)
ADR_BASE_LISTENER = /u01/app/oracle
③vi tnsnames.ora:
ENMO=
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = host02)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = ENMO)
)
)
④查看监听状态：
[oracle@host02 ~]$ lsnrctl status
LSNRCTL for Linux: Version 11.2.0.4.0 - Production on 01-DEC-2016 20:37:30
Copyright (c) 1991, 2013, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=host02)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 11.2.0.4.0 - Production
Start Date 01-DEC-2016 20:18:58
Uptime 0 days 0 hr. 18 min. 32 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/host02/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=host02)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))
Services Summary...
Service "ENMO" has 1 instance(s).
Instance "ENMO", status READY, has 1 handler(s) for this service...
Service "ORCLXDB" has 1 instance(s).
Instance "ENMO", status READY, has 1 handler(s) for this service...
The command completed successfully
⑤连接到sys赋权限：
SQL> conn / as sysdba
Connected.
SQL> grant create public database link,create database link to scott;
Grant succeeded.
⑥创建dblink：
SQL> create database link emp connect to scott identified by tiger using host02；
Database link created.
2.创建dblink第二种方法，是在本地数据库tnsnames.ora文件中没配置要远程访问的数据库。
1.设置监听：
①[root@host02 ~]# vi /etc/hosts
添加：【IP和名字】
192.168.206.2 host02
②vi listener.ora：
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = host02)(PORT = 1521))
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
)
)
ADR_BASE_LISTENER = /u01/app/oracle
③vi tnsnames.ora:
ENMO=
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = host02)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = ENMO)
)
)
④查看监听状态：
[oracle@host02 ~]$ lsnrctl status
LSNRCTL for Linux: Version 11.2.0.4.0 - Production on 01-DEC-2016 20:37:30
Copyright (c) 1991, 2013, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=host02)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 11.2.0.4.0 - Production
Start Date 01-DEC-2016 20:18:58
Uptime 0 days 0 hr. 18 min. 32 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/host02/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=host02)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))
Services Summary...
Service "ENMO" has 1 instance(s).
Instance "ENMO", status READY, has 1 handler(s) for this service...
Service "ORCLXDB" has 1 instance(s).
Instance "ENMO", status READY, has 1 handler(s) for this service...
The command completed successfully
⑤连接到sys赋权限：
SQL> conn / as sysdba
Connected.
SQL> grant create public database link,create database link to scott;
Grant succeeded.
⑥创建dblink：
SQL> create database link emp connect to scott identified by tiger using
2 '(DESCRIPTION =
3 (ADDRESS = (PROTOCOL = TCP)(HOST = host02)(PORT = 1521))
4 (CONNECT_DATA =
5 (SERVER = DEDICATED)
6 (SERVICE_NAME = ORCL)
7 )
8 )
9 ';
Database link created.
3.创建公共的dblink
语法：create public database link emp using 。。。