oracle dblink 实验

在testdb1中创建dblink到testdb2

testdb1和testdb2都是11.2.0.3版本

1：在testdb1中配置TNS $ORACLE_HOME/db_1/network/admin 创建tnsnames.ora

内容如下：

testdb2 =

(DESCRIPTION =

(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.23)(PORT = 1521))

(CONNECT_DATA =

(SERVER = DEDICATED)

(SERVICE_NAME = orcl)

(INSTANCE_NAME = orcl)

)

)

2：创建dblink

静态：

create public database link testdb2_link connect to system identified by redhat using 'testdb2';

动态：

create public database link testdb2_link connect to system identified by redhat using '

(DESCRIPTION =

(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.23)(PORT = 1521))

(CONNECT_DATA =

(SERVER = DEDICATED)

(SERVICE_NAME = orcl)

(INSTANCE_NAME = orcl)

)

)

';

create synonym testdb2user for all_users@testdb2_link;创建同义词;

select * from dba_synonyms where db_link is not null;

drop synonym testdb2user 删除同义词

3：查询

select *from all_users@testdb2_link

select * from testdb2user;

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

select owner, db_link from dba_db_links;

4：删除dblink

drop public database link TESTDB2_LINK;

5：impdp 通过dblink （long,lob类型的不支持，大对象类型不支持)

impdp system/redhat network_link=testdb1_link schemas=testuser;