oracle db link的檢視建立與刪除

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1.檢視dblink

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

或者

select * from dba_db_links;

2.建立dblink
前提:
    建立dblink的使用者有對應的資料庫許可權
        create public database link 或者create database link <wbr>
        可以使用
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grant create public database link,create database link to myAccount;

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之後不加public,則建立的dblink就不是公共的,就只有建立者可以使用了.
補充:如何確定資料庫的servicename:
    1.在sqlplus中使用<wbr><wbr><wbr>

show parameter[s] service_names;

        注意parameter和parameters都可以
    2.使用<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>

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

4.刪除
    注意:使用者有create public database link 或者create database link 許可權.
<wbr><wbr><wbr>

drop public database link dblinkname;