检查系统环境：
[root@localhost ~]# grep MemTotal /proc/meminfo #物理内存不低于1GB
MemTotal: 1491520 kB
[root@localhost ~]# grep SwapTotal /proc/meminfo #交换分区为物理内存的1.5-2陪；物理内存为2-16GB时，交换分区与物理内存相同
SwapTotal: 2097148 kB
安装oracle依赖软件：
yum install -y binutils compat-libcap1-1.10-1 compat-libstdc++-33 gcc gcc-c++ glibc glibc glibc-devel glibc-devel ksh libgcc libgcc libstdc++ libstdc++ libstdc++-devel libstdc++-devel libaio libaio libaio-devel libaio-devel make sysstat elftils-libelf unixODBC unixODBC unixODBC-devel elfutils-libelf elfutils-libelf-devel
修改系统环境：
groupadd oinstall
groupadd dba
useradd -g oinstall -G dba oracle
echo "qwe123"| passwd root --stdin
mkdir /opt/oracle
chown -R oracle:oinstall /opt/oracle/
chmod -R 755 /opt/oracle/
[root@localhost ~]# vim ~oracle/.bash_profile
umask 022
export ORACLE_BASE=/opt/oracle
export ORACLE_SID=/orc1
export DISPLAY=:0.0
export LANG=zh_CN.UTF-8
[root@localhost ~]# vim /etc/sysctl.conf
fs.aio-max-nr = 1048576
fs.file-max = 6815744
kernel.shmall = 2097152
kernel.shmmax = 536870912
kernel.shmmni = 4096
kernel.sem = 250 32000 100 128
net.ipv4.ip_local_port_range = 9000 65500
net.core.rmem_default = 262144
net.core.rmem_max = 4194304
net.core.wmem_default = 262144
net.core.wmem_max = 1048586
[root@localhost ~]# vim /etc/security/limits.conf
oracle soft nproc 8192
oracle hard nofile 65536
oracle soft nofile 32768
oracle hard nproc 16384
[root@localhost ~]# xhost +
[root@localhost ~]# su oracle
[oracle@localhost root]$ cd /opt/oracle/database/
[oracle@localhost database]$ ./runInstaller -jreLoc /usr/lib/jvm/jre-1.6.0
图形界面安装：
1.看到安装界面，“yes”再下一步就行了。
2.创建并配置一个数据库
3.选择服务器类型
4.单实例安装
5.这里我选择“典型安装”
8.配置密码和安装路径
9.自动检查环境参数和安装
安装完成以后提示用root初始化：
添加oracle的路径：
[root@localhost ~]# vim ~oracle/.bash_profile
export ORACLE_HOME=/home/oracle/app/oracle/product/11.2.0/dbhome_1/
PATH=$PATH:$HOME/bin:$ORACLE_HOME/bin
[root@localhost bin]# dbstart /home/oracle/app/oracle/product/11.2.0/dbhome_1/
进入数据库：
[root@localhost bin]# su oracle
[oracle@localhost bin]$ sqlplus sys/Benet4.0 AS SYSDBA
SQL*Plus: Release 11.2.0.1.0 Production on Tue Dec 30 19:46:37 2014
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Connected to an idle instance.
SQL>