identified by xx --密码
using ‘(DESCRIPTION =
(source_route = yes)
(ADDRESS = (PROTOCOL = TCP)(HOST = X.X.X.X)(PORT = 1521)) ----对方数据库的ip，和端口
(ADDRESS = (PROTOCOL = TCP)(HOST = X.X.X.X)(PORT = 1521)) -----本地数据库的ip和端口
(CONNECT_DATA =
(SERVICE_NAME = orcl) ---本地数据库名
)
)‘;
db link 连接不上
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