1、安装oracle11.2需要unixODBC和unixODBC-devel两个rpm，于是想手动安装，但发现依赖关系太多了。
[root@zhaozy-oracle oracle11g]# rpm -ivh unixODBC-2.2.11-10.el5.i386.rpm
warning: unixODBC-2.2.11-10.el5.i386.rpm: Header V3 DSA signature: NOKEY, key ID e8562897
error: Failed dependencies:
libodbc.so.1 is needed by unixODBC-2.2.11-10.el5.i386
libodbcinst.so.1 is needed by unixODBC-2.2.11-10.el5.i386
unixODBC-libs = 2.2.11-10.el5 is needed by unixODBC-2.2.11-10.el5.i386
[root@zhaozy-oracle oracle11g]# rpm -ivh unixODBC-devel-2.2.11-10.el5.i386.rpm
warning: unixODBC-devel-2.2.11-10.el5.i386.rpm: Header V3 DSA signature: NOKEY, key ID e8562897
error: Failed dependencies:
libboundparam.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
libesoobS.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
libgtrtst.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
libmimerS.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
libnn.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
libodbccr.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
libodbcdrvcfg1S.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
libodbcdrvcfg2S.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
libodbcinst.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
libodbcminiS.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
libodbcnnS.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
libodbctxtS.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
liboplodbcS.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
liboraodbcS.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
libsapdbS.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
libtdsS.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
libtemplate.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
unixODBC = 2.2.11-10.el5 is needed by unixODBC-devel-2.2.11-10.el5.i386
unixODBC-libs = 2.2.11-10.el5 is needed by unixODBC-devel-2.2.11-10.el5.i386
[root@zhaozy-oracle oracle11g]#
如果按照依赖一个个来装，不太现实，因为可能在安装过程中出现环依赖。
首先想到的是在安装系统的时候选择这两个rpm所在的package，刚开始不知道在那个package里，后来发现是在安装mysql服务器里可以选择unixODBC，始终木找到unixODBC-devel。
接着想使用yum命令，于是把redhat的yum源镜像改成centos的，执行yum install unixODBC-devel后，可以正常安装。于是又在centos5.9下测试安装unixODBC和unixODBC-devel，发现在安装unixODBC时，同时下载了unixODBC-libs。
最后，重新安装一个不含这两个包的redhat5.9，首先安装unixODBC-libs，然后安装unixODBC，最后安装unixODBC-devel，顺序不能错，成功。
[root@zhaozy-oracle oracle11g]# rpm -ivh unixODBC-libs-2.2.11-10.el5.i386.rpm warning: unixODBC-libs-2.2.11-10.el5.i386.rpm: Header V3 DSA signature: NOKEY, key ID e8562897 Preparing... ########################################### [100%] 1:unixODBC-libs ########################################### [100%] [root@zhaozy-oracle oracle11g]# rpm -ivh unixODBC-2.2.11-10.el5.i386.rpm warning: unixODBC-2.2.11-10.el5.i386.rpm: Header V3 DSA signature: NOKEY, key ID e8562897 Preparing... ########################################### [100%] 1:unixODBC ########################################### [100%] [root@zhaozy-oracle oracle11g]# rpm -ivh unixODBC-devel-2.2.11-10.el5.i386.rpm warning: unixODBC-devel-2.2.11-10.el5.i386.rpm: Header V3 DSA signature: NOKEY, key ID e8562897 Preparing... ########################################### [100%] 1:unixODBC-devel ########################################### [100%] [root@zhaozy-oracle oracle11g]#
问题解决。