dblink查看、创建、使用、删除

一、实例

-- Create database link

create public database link XXXXXXXX

connect to XXX identified
by XXX

using '(DESCRIPTION =(ADDRESS = (PROTOCOL =
TCP)(HOST = 192.168.0.2)(PORT = 1521))(CONNECT_DATA =(SERVER=
DEDICATED)(SERVICE_NAME = ora10g)))';

删除

-- Drop existing database link

drop database link XXXXXXXXX;

-- Create database link

create public database link XXXXXX

connect to XXX identified
by XXX

using '(DESCRIPTION =

(ADDRESS_LIST =(ADDRESS = (PROTOCOL = TCP)(HOST =
192.168.11.93)(PORT = 1521)))(CONNECT_DATA =(SERVICE_NAME
=orcl)))';

二、global_name

1.查看global_name

select * from global_name;

2.更改global_name

UPDATE global_name SET
global_name='ZJK.REGRESS.RDBMS.DEV.US.ORACLE.COM';

三、创建dblink

1.查看dblink

select owner,object_name from dba_objects where
object_type='DATABASE LINK';

或者

select * from dba_db_links;

2.创建dblink

前提:

创建dblink的用户有对应的数据库权限

create public database link 或者create database link

可以使用

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

来授权.

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)

)

)';

如果在create之后不加public,则创建的dblink就不是公共的,就只有创建者可以使用了.

补充:如何确定数据库的servicename:

1.在sqlplus中使用

show parameter[s] service_names;

注意parameter和parameters都可以

2.使用

select name,value from v$parameter where
name='service_names'

3.使用db link

例如,在本机数据库上创建了一个scott_rmthost的public
dblink(使用远程主机的scott用户连接),则用sqlplus连接到本机数据库,执行select * from scott.emp@scott_rmthot即可以将远程数据库上的scott用户下的emp表中的数据获取到.

也可以在本地建一个同义词来指向scott.emp@scott_rmthost,这样取值就方便多了.

4.删除

注意:用户有create
public database link 或者create database link 权限.

drop public database link dblinkname;