Red Hat 5.7 64 bits installed with default settings, with development server software group added during the installation.

Note: Starting with Oracle Database 11g Release 2 (11.2.0.2), all the 32-bit packages, except for gcc-32bit-4.3, listed in the following table are no longer required for installing a database on Linux x86-64. Only the 64-bit packages are required. However, for any Oracle Database 11g release before 11.2.0.2, both the 32-bit and 64-bit packages listed in the following table are required.

These packages are required:

rpm -q binutils-2.17.50.0.6
rpm -q compat-libstdc++-33-3.2.3
rpm -q elfutils-libelf-0.125
rpm -q elfutils-libelf-devel-0.125
rpm -q gcc-4.1.2
rpm -q gcc-c++-4.1.2
rpm -q glibc-2.5-24
rpm -q glibc-common-2.5
rpm -q glibc-devel-2.5
rpm -q glibc-headers-2.5
rpm -q ksh-20060214
rpm -q libaio-0.3.106
rpm -q libaio-devel-0.3.106
rpm -q libgcc-4.1.2
rpm -q libstdc++-4.1.2
rpm -q libstdc++-devel 4.1.2
rpm -q make-3.81
rpm -q sysstat-7.0.2

These packages are not required any more but I checked for them anyway to prevent any problems:

rpm -q compat-libstdc++-33-3.2.3 (32 bit)
rpm -q glibc-2.5-24 (32 bit)
rpm -q glibc-devel-2.5 (32 bit)
rpm -q libaio-0.3.106 (32 bit)
rpm -q libaio-devel-0.3.106 (32 bit)
rpm -q libgcc-4.1.2 (32 bit)
rpm -q libstdc++-4.1.2 (32 bit)

These packages were available but in a newer version:

rpm -ivh elfutils-libelf-0.125  (137-3)
rpm -ivh elfutils-libelf-devel-0.125 (137-3)
rpm -ivh glibc-2.5-24 (65)
rpm -ivh glibc-2.5-24 (65)
rpm -ivh ksh-20060214 (20100202-1.el5_6.6)
rpm -ivh libaio-devel-0.3.106
rpm -ivh libaio-devel-0.3.106
rpm -ivh sysstat-7.0.2

These packages were installed extra:

[root@oraclebox Server]# rpm -ivh libaio-devel-0.3.106-5.*
warning: libaio-devel-0.3.106-5.i386.rpm: Header V3 DSA signature: NOKEY, key ID 37017186
Preparing...                ########################################### [100%]
   1:libaio-devel           ########################################### [ 50%]
   2:libaio-devel           ########################################### [100%]
[root@oraclebox Server]# rpm -q libaio-devel
libaio-devel-0.3.106-5
libaio-devel-0.3.106-5

[root@oraclebox Server]# rpm -ivh sysstat-7.0.2-11.el5.x86_64.rpm
warning: sysstat-7.0.2-11.el5.x86_64.rpm: Header V3 DSA signature: NOKEY, key ID 37017186
Preparing...                ########################################### [100%]
   1:sysstat                ########################################### [100%]
[root@oraclebox Server]# rpm -q sysstat
sysstat-7.0.2-11.el5

Add these groups and users:

[root@oraclebox Server]# groupadd oinstall
[root@oraclebox Server]# groupadd dba
[root@oraclebox Server]# groupadd oper
[root@oraclebox Server]# useradd -g oinstall -G dba,oper oracle
[root@oraclebox Server]# passwd oracle
Changing password for user oracle.
New UNIX password:
BAD PASSWORD: it is based on a dictionary word
Retype new UNIX password:
passwd: all authentication tokens updated successfully.

Make sure the oracle user has the correct limits for handling files and processes:

/etc/security/limits.conf file:

oracle              soft    nproc   2047
oracle              hard    nproc   16384
oracle              soft    nofile  1024
oracle              hard    nofile  65536
oracle              soft    stack   10240

These are the default kernel settings:

[root@oraclebox Server]# cat /etc/sysctl.conf | grep ^[a-z]
net.ipv4.ip_forward = 0
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.accept_source_route = 0
kernel.sysrq = 0
kernel.core_uses_pid = 1
net.ipv4.tcp_syncookies = 1
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = 68719476736
kernel.shmall = 4294967296

Add these changes to the kernel settings:

# Added for oracle installation
fs.aio-max-nr = 1048576
fs.file-max = 6815744
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

Create this file structure and set the correct permissions:

[root@oraclebox Server]# mkdir /opt/oracle
[root@oraclebox Server]# chown -R oracle:oinstall /opt/oracle/
[root@oraclebox Server]# chmod -R 775 /opt/oracle/

Log in as oraqcle user and make sure you can use the X environment:

login as: oracle
oracle@oraclebox's password:
/usr/bin/xauth:  creating new authority file /home/oracle/.Xauthority
[oracle@oraclebox ~]$ umask
0022
[oracle@oraclebox ~]$ xclock

[oracle@oraclebox ~]$ echo $DISPLAY
localhost:11.0
[oracle@oraclebox ~]$ xclock
[oracle@oraclebox ~]$ export ORACLE_BASE=/opt/oracle

You can now start the installation.

http://docs.oracle.com/cd/E11882_01/install.112/e24326/toc.htm