1. Oracle Database 11gR2 Installation
Requirements:
 60GB of Hard disk
 4GB of RAM
 2 CPU
Create Group and User:
[root@anar]# groupadd -g 1000 oinstall
[root@anar]# useradd -u 1100 -g oinstall oracle
[root@anar]# 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.
Create the directories in which the Oracle software will be installed:
[root@anar]# mkdir -p /u01/app/oracle/product/11.2.0/dbhome_1
[root@anar]# chown -R oracle:oinstall /u01
[root@anar]# chmod -R 775 /u01
[root@anar u01]# su – oracle
[oracle@anar]$ cd /u01/database/
Before running ./runInstaller open a new terminal and run xhost + as a root user:
[root@anar u01]# xhost +
access control disabled, clients can connect from any host
Start Installation with runInstaller:
[oracle@anar database]$ ./runInstaller

2. Uncheck the Updates box and Click Next

3. click Yes
Select Skip Updates and click Next

4. Select “Create and configure a database” and click Next
Select “Server Class” and click Next

5. Oracle Base: /u01/apps/oracle
Software location: /u01/app/oracle/product/11.2.0/dbhome_1
Database File Location: /u01/app/oracle/oradata
Database Edition: Enterprise Edition (4.5GB)
Character Set: Unicode (AL32UTF8)
OSDBA Group: oinstall
Global Database name: PROD
passwords as you like here I have used “oracle” as password
and Click Next

6. Click Yes

7. Click Next

8. If you satisfied with the summary click Install

9. wait until Database Installation Completes

10. Click Ok

11. Run the Scripts as a root user by opening new terminal

12. Run the scripts as shown below

13. Oracle Database 11gR2 Installation Completes