oracle dblink遇到的問題

1，在不同用戶下不要存在相同名稱的dblink
2, 11g中密碼用雙引號
create database link xx connect to xx identified by “xx” using ‘(DESCRIPTION =(ADDRESS_LIST =(ADDRESS = (PROTOCOL = TCP)(HOST = xx)(PORT = 1523)))(CONNECT_DATA = (SERVICE_NAME = xx)))’