在ORACLE当中，如果想访问某个服务器，必需要设置TNS，它不想SQLSERVER那样，客户端会自动列举出在局域网内所有的在线服务器，只需在客户端选择需要的服务器，然后使用帐号与密码登录即可。而ORCAL是不会自动列举出网内的服务器的，需要通过读取TNS配置文件才能列出经过配置的服务器名。
ORACLE的配置文件名：tnsnames.ora
文件所在路径：安装ORACLE所在的目录/oracle/ora92/network/admin/tnsnames.ora
配置的一个实例：
# TNSNAMES.ORA Network Configuration File: D:/Oracle/network/admin/tnsnames.ora
# Generated by Oracle configuration tools.
ODS =
(description =
(address = (protocol = tcp)(host = 10.201.64.12)(port = 1521))
(connect_data =
(sid = ods)
)
)
AUTOCLM_10.210.4.11 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.210.4.11)(PORT = 1521))
)
(CONNECT_DATA =
(SID = autoclm)
(SERVER = DEDICATED)
)
)
PROPTEST_10.210.4.30 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.210.4.30)(PORT = 1521))
)
(CONNECT_DATA =
(SID = proptest)
(SERVER = DEDICATED)
)
)
p05 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.201.64.14)(PORT = 1521))
)
(CONNECT_DATA =
(SID = p05)
(SERVER = DEDICATED)
)
)
p05_8 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.201.64.8)(PORT = 1521))
)
(CONNECT_DATA =
(SID = p05)
)
)
ODS =
(description =
(address = (protocol = tcp)(host = 10.201.64.8)(port = 1521))
(connect_data =
(sid = p05)
)
)
test_14 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.201.64.14)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = p05test)
)
)
CIBS =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.203.68.71)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = cibs)
)
)
ORA10 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.202.1.77)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = ORA10)
)
)
CIBS =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.203.68.71)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = cibs)
)
)
CAI =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.203.68.80)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = proplh)
)
)
CHELP =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.203.68.137)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = autoclm)
)
)
配置完毕后，客户端就可以列举出“CAI”，“CHELP”，“CIBS”等的服务器名出来。