在虚拟机上成功安装了oracle 11g，感觉比10g的安装相比没多大变化，11g会提示安装所需的package，而在检测阶段发现还是有一部分package缺少，但是ignore后还是可以顺利安装的。不过安装软件和数据库后，却无法执行sqlplus等命令。
[root@orcl11g ~]# su - oracle
[oracle@orcl11g ~]$ sqlplus /nolog
sqlplus: error while loading shared libraries: /opt/oracle11g/product/11.2.0/dbhome_1/lib/libclntsh.so.11.1: cannot restore segment prot after reloc: Permission denied
权限不足，而/opt目录下已经级联chown给oracle用户了，从网络上得知可能是selinux导致。
[root@orcl11g sysconfig]# vi /etc/sysconfig/selinux
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
# enforcing - SELinux security policy is enforced.
# permissive - SELinux prints warnings instead of enforcing.
# disabled - SELinux is fully disabled.
SELINUX=enforcing
# SELINUXTYPE= type of policy in use. Possible values are:
# targeted - Only targeted network daemons are protected.
# strict - Full SELinux protection.
SELINUXTYPE=targeted
修改SELINUX=enforcing为注释，然后增加SELINUX=disabled，重启os即可。
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