Step 1 - Edit Host Files - /etc/hosts

127.0.0.1 localhost.localdomain localhost
192.168.0.210 oracle_12C.localdomain oracle_12C


Step 2 - Edit Kernel Parameters /etc/sysctl.conf

fs.file-max = 6815744
kernel.sem = 250 32000 100 128
kernel.shmmni = 4096
kernel.shmall = 1073741824
kernel.shmmax = 4398046511104
net.core.rmem_default = 262144
net.core.rmem_max = 4194304
net.core.wmem_default = 262144
net.core.wmem_max = 1048576
fs.aio-max-nr = 1048576
net.ipv4.ip_local_port_range = 9000 65500

sysctl -p - apply changes


Step 3 - Edit Limits file - etc/security/limits.conf

oracle soft nofile 1024
oracle hard nofile 65536
oracle soft nproc 2047
oracle hard nproc 16384
oracle soft stack 10240
oracle hard stack 32768


Step 4 - Install dependencies

yum-config-manager --enable rhui-REGION-rhel-server-optional

yum install binutils -y
yum install compat-libcap1 -y
yum install compat-libstdc++-33 -y
yum install compat-libstdc++-33.i686 -y
yum install gcc -y
yum install gcc-c++ -y
yum install glibc -y
yum install glibc.i686 -y
yum install glibc-devel -y
yum install glibc-devel.i686 -y
yum install ksh -y
yum install libgcc -y
yum install libgcc.i686 -y
yum install libstdc++ -y
yum install libstdc++.i686 -y
yum install libstdc++-devel -y
yum install libstdc++-devel.i686 -y
yum install libaio -y
yum install libaio.i686 -y
yum install libaio-devel -y
yum install libaio-devel.i686 -y
yum install libXext -y
yum install libXext.i686 -y
yum install libXtst -y
yum install libXtst.i686 -y
yum install libX11 -y
yum install libX11.i686 -y
yum install libXau -y
yum install libXau.i686 -y
yum install libxcb -y
yum install libxcb.i686 -y
yum install libXi -y
yum install libXi.i686 -y
yum install make -y
yum install sysstat -y
yum install unixODBC -y
yum install unixODBC-devel -y


Step 5 - Add Groups and Users

groupadd -g 54321 oinstall
groupadd -g 54322 dba
groupadd -g 54323 oper

useradd -u 54321 -g oinstall -G dba,oper oracle
passwd oracle

Step 6 - /etc/security/limits.d/90-nproc.conf

# Change this
* soft nproc 1024

# To this
* - nproc 16384

Step 7 - Set SELINUX

SELINUX=permissive

run the command after edit setenforce Permissive

Step 8 - Stop Firewall

# service iptables stop
# chkconfig iptables off

Step 9 - Create directories for oracle Installation

mkdir -p /oracle/product/12.1.0/db_1
chown -R oracle:oinstall /oracle
chmod -R 775 /oracle

Step 10 - xhost +

Step 11 - Edit bash profile for oracle user /home/oracle/.bash_profile

# Oracle Settings
export TMP=/tmp
export TMPDIR=$TMP

export ORACLE_HOSTNAME=oracle_12C.localdomain
export ORACLE_UNQNAME=db1
export ORACLE_BASE=/oracle
export ORACLE_HOME=$ORACLE_BASE/product/12.1.0/­db_1
export ORACLE_SID=db1

export PATH=/usr/sbin:$PATH
export PATH=$ORACLE_HOME/bin:$PATH

export LD_LIBRARY_PATH=$ORACLE_HOME/lib:/lib:/u­sr/lib
export CLASSPATH=$ORACLE_HOME/jlib:$ORACLE_HOME­/rdbms/jlib

Step - 12 Extract Installation Files

unzip linuxamd64_12c_database_1of2.zip
unzip linuxamd64_12c_database_2of2.zip

Step - 13 Start the Oracle Universal Installer

./runInstaller