我有要安装到 CentOS 6 系统上的软件模块的 RPM。我已通过命令“rpm -ivh”将此 RPM 安装到 yum 数据库中。我的理解是，现在 RPM 可用于通过 'yum install ' 安装模块，但这并没有奏效，即当我尝试这样做时，我收到“无需安装”消息。所以我一定没有做对吗？任何人都可以建议吗？
仅供参考，这是我迄今为止尝试过的：
$ 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
提前感谢您的任何建议，见解等。