Oracle建立數據庫連接

**********建立數據庫連接******************
create public database link link_gzzl
connect to system identified by "123456"
using '(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.20)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = GZZL)
)
)';
***********從A庫取B庫的數據
select * from pat_master_index@likn_gzzl;