1. To begin, make sure that all the packages currently installed

 yum update -y

1. install pre requirements

   yum install oracle-database-server-12cR1-preinstall

   sysctl -p

2. Create user accounts

   groupadd oinstall

   groupadd dba

   useradd -g oinstall -G dba oracle

   passwd oracle

3. Add/verify paramerters to /etc/sysctl.conf
   fs.aio-max-nr = 1048576
   fs.file-max = 6815744
   kernel.shmall = 2097152
   kernel.shmmax = 8329226240
   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

4. Apply params

sysctl -p

sysctl -a

1. Set oracle limits in /etc/security/limits.conf
   oracle soft nproc 2047
   oracle hard nproc 16384
   oracle soft nofile 1024
   oracle hard nofile 65536

2. create directories

   mkdir /u01

mkdir /u02

chown -R oracle:oinstall /u01

chown -R oracle:oinstall /u02

chmod -R 775 /u01

chmod -R 775 /u02

chmod g+s /u01

chmod g+s /u02

1. run installer
   ./runInstaller