Step by Step Oracle Application R12 Installation with screen shots

Step by Step instructions to install Oracle Applications R12 on Oracle Enterprise Linux are

described in this article. This is a single node installation, meaning that the database, all product directories and AD core directories, and all servers (concurrent processing, forms, and Web) are installed on a single node under one common APPL_TOP.

Stage (R12 Software):
Rapid Install installs the Java Development Kit (JDK) 5.0 automatically. Oracle Applications Software from Oracle eDelivery is already staged. If you have got the CDs, Stage them using

$ perl /mnt/cdrom/Disk1/rapidwiz/adautostg.pl

System Requirement:
Memory: 2 to 4 GB memory and swap always double of RAM.
Disk Requirement: 30 GB for staging Apps R12 software
161 GB for Vision install
200 GB total.
For fresh installation:

Middle Tier 40GB Data Base Tier – Prod 60GB
We are Installing R12 on Redhat Linux.
For installing Redhat see Step by Step linux installation on VMware with Screenshots
(Please Create 2 mount Points as per above requirement one is for Application tire and one for Database tire. On my Machine I have /oradata for database tier and /apps for Application tier)

Ensure the following RPMs are installed:
(Or at the time of Redhat Linux Installation select all the Packages)
glibc-2.3.4-2.25
glibc-common-2.3.4-2.25
binutils-2.15.92.0.2-21
compat-libstdc++-296-2.96-132.7.2
gcc-3.4.6-3
gcc-c++-3.4.6-3
libgcc-3.4.6-3
libstdc++-3.4.6-3
libstdc++-devel-3.4.6-3
openmotif21-2.1.30-11.RHEL4.6**
pdksh-5.2.14-30.3
setarch-1.6-1
make-3.80-6.EL4
gnome-libs-1.4.1.2.90-44.1
sysstat-5.0.5-11.rhel4
compat-db-4.1.25-9
control-center-2.8.0-12.rhel4.5
xscreensaver-4.18-5.rhel4.11
libaio-0.3.105-2
libaio-devel-0.3.105-2

Set Kernel Parameters:
vi /etc/sysctl.conf and enter the following parameters.
# vi /etc/sysctl.conf
kernel.shmall = 2097152
kernel.shmmax = 4294967295
kernel.shmmni = 4096
kernel.sem = 256 32000 100 142
fs.file-max = 131072
net.ipv4.ip_local_port_range = 10000 65000
kernel.msgmni = 2878
kernel.msgmax = 8192
kernel.msgmnb = 65535
net.core.rmem_default = 262144
net.core.wmem_default = 262144
net.core.rmem_max = 4194304
net.core.wmem_max = 262144

After editing /etc/sysctl.conf file to configure your kernel settings.
use the "sysctl -p" command or restart the system to invoke the new settings
# sysctl -p

Increase user limits: Add the following to /etc/security/limits.conf:
# vi /etc/security/limits.conf
* hard nofile 65535
* soft nofile 4096
* hard nproc 16384
* soft nproc 2047

OS Users and group creation:
Add the group and users
# groupadd dba
# useradd oracle -g dba
# useradd applmgr -g dba
# passwd oracle (give the password for oracle)
# passwd applmgr (give the password for applmgr)
Give permissions to oracle and applmgr so that they can write to /oradata and /apps:
# chown -R oracle:dba /oradata
# chown -R applmgr:dba /apps# chmod -R 775 /oradata

# chmod -R 775 /apps

Check that the /etc/hosts entries are as follows:
127.0.0.1 localhost.localdomain localhost
<ip address> <hostname>.<domainname> aliasname

eg: My entries are as follows
127.0.0.1 localhost.localdomain localhost
192.168.0.94 oracle.com oracle

Now all the prerequisites are done lets start the Installtion.

To start the installation go to

# cd /<path of stage>/startCD/Disk1/rapidwiz/

# ./rapidwiz

Note: Run above command from root user.

1: Click next

2: Click Next

3: Click Next

4: This is Screen is Useful in Multi node Installation. In single node Just Click Next

5: This Screen is for Port number you can change it or you can go with the default.

5: Database Type: There are two options Fresh Database and Vision Demo (fresh database is fully configurable database used for implementation, where as Vision Demo database is a demonstration database having data of fake company called Vision Enterprises.) So select Fresh Database.

Database SID: its for database SID default is PROD you can change it.

Host Name: It will automatically select your machines host name.

Database OS User: Its for Database OS User we have oracle user.

Base directory: Select the Base directory we have created /oradata for database installation.

Click Next

6: Click Next

7: Click Next

8: Click Next

9: Select IANA character set to UTF-8
Click Next

10: Applications Node Configuration: This is the screen where you configure Applications Node
Apps OS User: applmgr
Base Directory: /apps (for applications file)
Instance directory: /apps/inst
Click Next

11: This Screen for multi node installation where you can add additional node.
Click Next

12: System Check Status: This rapid install wizard checks the system eg: Memory, Disk space, permissions and ownership etc.

13: After checking the system if everything is correct you will see the following screen if not then you will see errors in Red. You can correct those errors and Retry.
Click Next