suse10sp2下安装oracle11g客户端，新建aipcti用户，tnsping vsm（vsm为客户端下服务名）失败，报错： tns-03505: failed to reso
问题描述；
suse10sp2下安装oracle11g客户端，新建aipcti用户，tnsping vsm（vsm为客户端下服务名）失败，报错：
 tns-03505: failed to resolve name ，used parameter files:
 /opt/oracle/product/11g/db/network/admin/sqlnet.ora。
 而在oracle用户下直接执行此命令则没有问题。
问题处理：
 1，使用aipcti用户直接tnsping +数据库ip则没有问题，但显示是通过
 used ezconnect adapter to resolve the alias 来解析的。
2，打开客户端下sqlnet.ora,里面有通过客户端访问数据库服务器顺序。可以看到该文件中访问顺序是先访问tnsnames,如果该文件下没有相关内容或访问失败，再通过ezconnect访问。
oracle@urp1vsmdb2:/opt/oracle/product/11g/db/network/admin> more sqlnet.ora
 # sqlnet.ora network configuration file: /opt/oracle/product/11g/db/network/admin/sqlnet.ora
 # generated by oracle configuration tools.
names.directory_path= (tnsnames, ezconnect)
3，，显示tnsname.ora的权限：
 oracle@urp1vsmdb2:/opt/oracle/product/11g/db/network/admin> ll -al tnsnames.ora
 -rw-r----- 1 oracle oinstall 493 2011-09-23 16:09 tnsnames.ora
发现aipcti用户对该文件没有执行权限导致访问失败。
 修改tnsnames.ora权限
 oracle@urp1vsmdb2:/opt/oracle/product/11g/db/network/admin> chmod 644 tnsnames.ora
 oracle@urp1vsmdb2:/opt/oracle/product/11g/db/network/admin> ls -al tnsnames.ora
 -rw-r--r-- 1 oracle oinstall 493 2011-09-23 16:09 tnsnames.ora
4，修改后再次在aipcti下执行已经可以正常tnsping 客户端
 /aipcti/icddir/bin>tnsping vsm
tns ping utility for linux: version 11.1.0.7.0 - production on 26-9 -2011 14:38:04
copyright (c) 1997, 2008, oracle.  all rights reserved.
used parameter files:
 /opt/oracle/product/11g/db/network/admin/sqlnet.ora
used tnsnames adapter to resolve the alias
 attempting to contact (description = (address_list = (address = (protocol = tcp)(host = 10.110.153.64)(port = 1521))) (connect_data = (service_name = uivr)))
 ok (0 msec)
以下为两种方式下输出结果对比：
 1，aipcti用户下使用tnsping+数据库ip
 /aipcti/icddir/bin>tnsping 10.110.153.64
tns ping utility for linux: version 11.1.0.7.0 - production on 26-9 -2011 14:05:27
copyright (c) 1997, 2008, oracle.  all rights reserved.
used parameter files:
 /opt/oracle/product/11g/db/network/admin/sqlnet.ora
used ezconnect adapter to resolve the alias
 attempting to contact (description=(connect_data=(service_name=))(address=(protocol=tcp)(host=10.110.153.64)(port=1521))(address=(protocol=tcp)
(host=10.110.153.64)(port=1521))(address=(protocol=tcp)(host=10.110.153.64)(port=1521)))
 ok (0 msec)
2，aipcti用户下使用tnsping+服务名，正常的：
 oracle@urp1vsmdb2:/opt/oracle/product/11g/db/network/admin> tnsping vsm
tns ping utility for linux: version 11.1.0.7.0 - production on 26-sep-2011 14:28:37
copyright (c) 1997, 2008, oracle.  all rights reserved.
used parameter files:
 /opt/oracle/product/11g/db/network/admin/sqlnet.ora
used tnsnames adapter to resolve the alias
 attempting to contact (description = (address_list = (address = (protocol = tcp)(host = 10.110.153.64)(port = 1521))) (connect_data = (service_name = uivr)))
 ok (10 msec)