1、oracle-rdbms-server-11gR2-preinstall RPM 软件包的功能
a、 Automatically downloading and installing any additional software packages and specific package versions needed for installing Oracle Grid Infrastructure and Oracle Database 12 c Release 1 (12.1) or 11g Release 2 (11.2.0.3), with package dependencies resolved via yum or up2date capabilities.
b、Creating the user oracle and the groups oinstall (for OraInventory) and dba (for OSDBA), which are used during database installation. (For security purposes, this user has no password by default and cannot log in remotely. To enable remote login, please set a password using the passwd tool.)
c、Modifying kernel parameters in /etc/sysctl.conf to change settings for shared memory, semaphores, the maximum number of file descriptors, and so on.
d、Setting hard and soft shell resource limits in /etc/security/limits.conf, such as the locked-in memory address space, the number of open files, the number of processes, and core file size.
e、Setting numa=off in the kernel for x86_64 machines.
2、操作步骤
a、确保网络畅通，即可连接到Internet。
b、已经安装了yum包管理工具。
c、切换到目录 /etc/yum.repos.d/
d、获取配置文件并进行相应修改wget http://public-yum.oracle.com/public-yum-ol6.repo(所需安装版本项下字段enabled=0更改为enabled=1)
e、使用yum安装oracle-rdbms-server-11gR2-preinstall包(oracle-rdbms-server-11gR2-preinstall)
f、校验内核修改日志及原文件备份情况
3、实战演习
a、检查网络环境，确保网络畅通
[root@oel63 ~]# cat /etc/issue
Oracle Linux Server release 6.3
Kernel \r on an \m
[root@oel63 ~]# ping www.baidu.com
PING www.a.shifen.com (115.239.211.110) 56(84) bytes of data.
64 bytes from 115.239.211.110: icmp_seq=1 ttl=54 time=39.2 ms
64 bytes from 115.239.211.110: icmp_seq=2 ttl=54 time=42.2 ms
b、检查yum是否已安装
[root@oel63 ~]# rpm -qa | grep yum
yum-utils-1.1.30-14.el6.noarch
PackageKit-yum-plugin-0.5.8-20.0.1.el6.x86_64
yum-rhn-plugin-0.9.1-40.0.1.el6.noarch
yum-plugin-security-1.1.30-14.el6.noarch
yum-3.2.29-30.0.1.el6.noarch
PackageKit-yum-0.5.8-20.0.1.el6.x86_64
yum-metadata-parser-1.1.2-16.el6.x86_64
c、切换到目录 /etc/yum.repos.d/
[root@oel63 ~]# cd /etc/yum.repos.d/
d、获取配置文件并进行相应修改
[root@oel63 yum.repos.d]# wget http://public-yum.oracle.com/public-yum-ol6.repo
--2014-05-16 14:41:51-- http://public-yum.oracle.com/public-yum-ol6.repo
Resolving public-yum.oracle.com... 184.51.198.32, 184.51.198.8, 184.51.198.65
Connecting to public-yum.oracle.com|184.51.198.32|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 4233 (4.1K) [text/plain]
Saving to: “public-yum-ol6.repo”
100%[======================================>] 4,233 --.-K/s in 0.001s
2014-05-16 14:41:51 (5.76 MB/s) - “public-yum-ol6.repo” saved [4233/4233
[root@oel63 yum.repos.d]# ls -hltr
total 8.0K
-rw-r--r--. 1 root root 4.2K Nov 25 04:58 public-yum-ol6.repo
[root@oel63 yum.repos.d]# vi public-yum-ol6.repo
#本环境为Oracle Linux 6.3，因此修改了以下2个部分。即将需要安装的部分的enabled的值置为1
[ol6_u3_base]
name=Oracle Linux $releasever Update 3 installation media copy ($basearch)
baseurl=http://public-yum.oracle.com/repo/OracleLinux/OL6/3/base/$basearch/
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-oracle
gpgcheck=1
enabled=1
[ol6_UEK_base]
name=Unbreakable Enterprise Kernel for Oracle Linux $releasever ($basearch)
baseurl=http://public-yum.oracle.com/repo/OracleLinux/OL6/UEK/base/$basearch/
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-oracle
gpgcheck=1
enabled=1
e、使用yum安装oracle-rdb