修改 %ORACLE_HOME%\\product\\10.2.0\\db_1\\NETWORK\\ADMIN\\tnsnames.ora

# tnsnames.ora Network Configuration File: D:\\oracle\\product\\10.2.0\\db_1\\network\\admin\\tnsnames.ora
# Generated by Oracle configuration tools.

ORCL =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
)
)

EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
)
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
)
)

-- 添加内容为你要链接的远程数据库的信息
tarena =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 219.231.132.71)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = tarena)
)
)