[oracle@localhost ~]$ tnsping 211.1XX.XX.XX
TNS Ping Utility for Linux: Version 10.2.0.1.0 - Production on 10-DEC-2008 09:45:50
Copyright (c) 1997, 2005, Oracle. All rights reserved.
Used parameter files:
/home/oracle/product/10.2/network/admin/sqlnet.ora
TNS-03505: Failed to resolve name
显然sqlnet.ora文件中的连接控制参数有些问题，检查下：
[oracle@localhost ~]$ more /home/oracle/product/10.2/network/admin/sqlnet.ora
# sqlnet.ora Network Configuration File: /home/oracle/product/10.2/network/admin/sqlnet.ora
# Generated by Oracle configuration tools.
NAMES.DIRECTORY_PATH= (TNSNAMES)
#SQLNET.AUTHENTICATION_SERVICES= (NTS)
#NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)
参数NAMES.DIRECTORY_PATH只有一个TNSNAMES，看看官方文档的介绍：
tnsnames:local naming naming method
Set to resolve a net service name through the tnsnames.ora file on the client.
ldap:directory naming naming method
Set to resolve a database service name, net service name, or net service alias through a directory server.
onames:Oracle Names method
Set to resolve database objects through a Oracle Names server.
hostname:host naming method
Set to resolve a host name alias through an existing names resolution service or a centrally-maintained set of /etc/hosts files.
cds:Cell Directory Services (CDS) external naming method
Set to resolve an Oracle database name in a Distributed Computing Environment (DCE) environment.
nis:Network Information Service (NIS) external naming method
Set to resolve service information through an existing NIS.
应该有六个参数的，于是增加一个hostname参数。再次进行连接即告成功。
[oracle@localhost ~]$ tnsping 2XX.1XX.2XX.XX
TNS Ping Utility for Linux: Version 10.2.0.1.0 - Production on 10-DEC-2008 09:56:52
Copyright (c) 1997, 2005, Oracle. All rights reserved.
Used parameter files:
/home/oracle/product/10.2/network/admin/sqlnet.ora
Used HOSTNAME adapter to resolve the alias
Attempting to contact (DESCRIPTION=(CONNECT_DATA=(SERVICE_NAME=211.139.222.155))(ADDRESS=(PROTOCOL=TCP)(HOST=211.139.222.155)(PORT=1521)))
OK (70 msec)
BTW:
其实这个参数的default值Default
NAMES.DIRECTORY_PATH=(tnsnames, onames, hostname) 应经可以满足基本的要求了。-:)
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