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我有我想要安装到CentOS 6系统上的软件模块的RPM。我已经通过命令'rpm -ivh'将此RPM安装到yum数据库中。我的理解是，现在RPM可以用来通过'yum install'来安装模块，但是这没有奏效，即当我尝试时，我得到了“没有安装”的消息。所以我不能做正确的事情？任何人都可以建议吗？如何使用RPM（cx_Oracle）将软件安装到CentOS 6上？
FYI这里是我试过到目前为止：
$ rpm -ivh cx_Oracle-5.1.2-11g-py27-1.x86_64.rpm
Preparing... ########################################### [100%]
1:cx_Oracle ########################################### [100%]
$ yum search cx_Oracle
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirror.ash.fastserv.com
* extras: mirror.symnds.com
* updates: ftp.linux.ncsu.edu
base | 3.7 kB 00:00
extras | 3.5 kB 00:00
updates | 3.5 kB 00:00
============================ N/S Matched: cx_Oracle ============================
cx_Oracle.x86_64 : Python interface to Oracle
$ yum install cx_Oracle
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirror.ash.fastserv.com
* extras: mirror.symnds.com
* updates: ftp.linux.ncsu.edu
base | 3.7 kB 00:00
extras | 3.5 kB 00:00
updates | 3.5 kB 00:00
Setting up Install Process
Nothing to do
$ yum update cx_Oracle
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirror.ash.fastserv.com
* extras: mirror.symnds.com
* updates: ftp.linux.ncsu.edu
base | 3.7 kB 00:00
extras | 3.5 kB 00:00
updates | 3.5 kB 00:00
Setting up Update Process
No Packages marked for Update
在此先感谢您的任何建议，见解等