Oracle Database 11g Release 2 Installation on RHEL/CentOS 6.x/5.x/4.x

As we all know Oracle database is the most popular and widely used Relational Database Management System (RDBMS) in the world. This post describes step by step installation of Oracle Database 11g Release 2 32bit on CentOS 6.4 32bit. The installation steps should not be vary on most of the Red Hat based Linux distributions.

Installing Oracle Database 11g Release 2

Step 1: Install Oracle Dependencies

We use “oracle-rdbms-server-11gR2-preinstall” package offered by “Oracle Public Yum” repository. The Oracle public yum repository provides a free and easiest way to install all the latest Oracle Linux dependencies automatically. To setup yum repository, follow the instructions provided below.

Use “wget” command to Download appropriate yum configuration file under /etc/yum.repos.d/ directory as root user.

RHEL/CentOs 6.x
# cd /etc/yum.repos.d
# wget
RHEL/CentOs 5.x
# cd /etc/yum.repos.d
# wget
RHEL/CentOs 4.x
# cd /etc/yum.repos.d
# wget

Now perform the following “yum” command to install all the necessary prerequisites automatically.

[root@oracle]# yum install oracle-rdbms-server-11gR2-preinstall

While importing GPG key, you might get “GPG key retrieval failed” error as shown below. Here, you need to import proper GPG key for your OS release.

Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-oracle
GPG key retrieval failed: [Errno 14] Could not open/read file:///etc/pki/rpm-gpg/RPM-GPG-KEY-oracle

Download and verify the appropriate Oracle Linux GPG Key that best matches your RHEL/CentOS compatible OS release.

RHEL/CentOs 6.x
# wget -O /etc/pki/rpm-gpg/RPM-GPG-KEY-oracle
RHEL/CentOs 5.x
# wget -O /etc/pki/rpm-gpg/RPM-GPG-KEY-oracle
RHEL/CentOs 4.x
# wget -O /usr/share/rhn/RPM-GPG-KEY-oracle

Step 2: Setting Hostname

Open the “/etc/sysconfig/network” file and modify the HOSTNAME to match your FQDN (Fully Qualified Domain Name) host name.

[root@oracle]# vi /etc/sysconfig/network

Open “/etc/hosts” file and add fully qualified hostname for the server.

[root@oracle]# vi /etc/hosts		oracle

Now you need to restart networking on the server to make sure that changes will be persistent on reboot.

[root@oracle]# /etc/init.d/network restart

Step 3: Oracle User Settings

Set the password for the “oracle” user.

[root@oracle]# passwd oracle

Changing password for user oracle.
New password:
BAD PASSWORD: it is based on a dictionary word
Retype new password:
passwd: all authentication tokens updated successfully.

Add the entry to file “/etc/security/limits.d/90-nproc.conf” as described below.

[root@oracle]# vi /etc/security/limits.d/90-nproc.conf
# Default limit for number of user's processes to prevent
# accidental fork bombs.
# See rhbz #432903 for reasoning.

*          soft    nproc     1024
# To this
* - nproc 16384

Set SELinux to “permissive” mode by editing the file “/etc/selinux/config“.

[root@oracle]# vi /etc/selinux/config

Once you’ve made change, don’t forger to restart the server to reflect new changes.

[root@oracle]# reboot

Login as Oracle user and open file “.bash_profile“, which is available on oracle user’s home directory, make an entries as described below. Make sure you set correct hostname to ““.

[root@oracle]# su oracle
[oracle@oracle ~]$ vi .bash_profile
# Oracle Settings
TMP=/tmp; export TMP
ORACLE_BASE=/u01/app/oracle; export ORACLE_BASE
ORACLE_HOME=$ORACLE_BASE/product/11.2.0/dbhome_1; export ORACLE_HOME
PATH=/usr/sbin:$PATH; export PATH


Switch to root user and issue the following command to allow Oracle user to access X Server.

[root@oracle]# xhost +

Create the directories and set the appropriate permissions in which the Oracle software will be installed.

[root@oracle]# mkdir -p /u01/app/oracle/product/11.2.0/dbhome_1
[root@oracle]# chown -R oracle:oinstall /u01
[root@oracle]# chmod -R 775 /u01

Step 4: Downloading Oracle Software

Sign-up and Download the Oracle software using the following link.

  1. Oracle Database 11g Release 2
Download Oracle 11g Release 2
Download Oracle 11g Release 2

The Oracle package contains 2 zip files which you must first accept the license agreement before downloading. I’ve given the files names for you reference, please download these files for your system architecture somewhere under “/home/oracle/“.

For Linux x86 Systems
For Linux x86-64 Systems

Step 5: Oracle Installation

Now let’s start Oracle installation. First of all need to switch as ‘oracle’ user to install database.

[oracle@oracle ~]$ su oracle

Extract compressed Oracle database source files to the same directory “/home/oracle/“.

[oracle@oracle ~]$ unzip

[oracle@oracle ~]$ unzip

Post unzip source file, directory called database will be created, go to inside the directory and execute below script to start Oracle database installation process.

[oracle@oracle database]$ cd database

[oracle@oracle database]$ ./runInstaller

1. RunInstaller will call Oracle Universal Installer (OUI), wherein look and feel & steps are the same across all the operating system.

Oracle Universal Installer
Oracle Universal Installer

2. Provide your email address to be informed of security issues and receive security updates.

Configure Security Updates
Configure Oracle Security Updates

3. Create and Configure a Database

Create Oracle Database
Create Oracle Database

4. Choose the system class, either Desktop or Server.

Select System Class
Select Oracle System Class

5. Select the type of database installation you want to perform.

Oracle Node Selection
Select Database Installation Type

6. Select “Typical install” option to install full oracle installation with basic configuration.

Select Oracle Install Type
Select Typical Install

7. Set Administrative password and perform full Database installation with basic configuration.

Oracle Typical Installation Configuration
Set Oracle Administrative Password

8. Please click on “Yes” to continue with installation.

Oracle Typical Install Configuration
Typical Install Configuration Confirm

9. Create Inventory

Create Oracle Inventory
Create Inventory

10. If you faced prerequisites warning during installation. Click on “Fix & Check Again“. Oracle fixes Prerequisites by itself. This is the new feature of Oracle Database 11g.

Perform Prerequisite Checks
Perform Prerequisite Checks

The pdksh package is not available in Oracle repository due to which you need to download and install it manually.

[root@oracle]# wget

During pdksh package installation you may encountered conflict error of ksh package. Remove ksh package forcefully and install the pdksh package with given below command:-

[root@oracle]# rpm -e ksh-20100621-19.el6_4.4.i686 --nodeps
[root@oracle]# rpm -ivh pdksh-5.2.14-2.i386.rpm

11. Performing Prerequisite checks: It’s test whether sufficient total SWAP space is available on the system.

Performing Prerequisite SWAP Check
Performing Prerequisite SWAP Check

12. Installation Summary: Click on Save Response File. This file is useful for Oracle Silent Mode Installation

Oracle Installation Summary
Oracle Installation Summary

13. Save Response File somewhere in your system.

Save Response File
Save Response File

14. Product Installation Progress

Install Oracle Product
Product Install

15. Copying database files

Copying Database Files
Copying Database Files

16. Click on “Password Management“.

Oracle Password Management
Oracle Password Management

17. Set password for user “SYS” and click on OK to continue.

Set SYS User Password
Set SYS User Password

18. Configuration scripts need to be executed as the “root” user. Go to the path given in the screen and execute the scripts one by one. Click on ‘OK‘ once scripts is executed.

Execute Configuration Scripts
Execute Configuration Scripts
[root@oracle]# cd /u01/app/oraInventory
[root@oracle oraInventory]# ./
Changing permissions of /u01/app/oraInventory.
Adding read,write permissions for group.
Removing read,write,execute permissions for world.

Changing groupname of /u01/app/oraInventory to oinstall.
The execution of the script is complete.
[root@oracle]# cd /u01/app/oracle/product/11.2.0/dbhome_2/
[root@oracle dbhome_2]# ./
Running Oracle 11g script...

The following environment variables are set as:
    ORACLE_OWNER= oracle
    ORACLE_HOME=  /u01/app/oracle/product/11.2.0/dbhome_2

Enter the full pathname of the local bin directory: [/usr/local/bin]:
   Copying dbhome to /usr/local/bin ...
   Copying oraenv to /usr/local/bin ...
   Copying coraenv to /usr/local/bin ...

Creating /etc/oratab file...
Entries will be added to the /etc/oratab file as needed by
Database Configuration Assistant when a database is created
Finished running generic part of script.
Now product-specific root actions will be performed.
Finished product-specific root actions.

19. The installation of Oracle Database is successful.

Oracle Installation Completed
Oracle Installation Finish

20. To test your Oracle installation navigate to web based management interface for your system at “localhost” with the user name “SYS” connecting as “SYSDBA” and using the password you set during the install of Oracle. Remember to open port 1158 on your firewall and restart the iptables service.

[root@oracle]# iptables -A INPUT -p tcp --dport 1158 -j ACCEPT
[root@oracle]# service iptables restart
Oracle Enterprise Manager Login
Oracle Enterprise Manager Login

21. Oracle Enterprise Database Control Manager

Oracle Database Control Manager
Oracle Database Control Manager

Now you can start using Oracle. I highly recommend you to follow the Oracle Documentation for more help. There are number of client applications out there which can help you, like the command line tool called Oracle Instant Client and the Oracle SQL Developer UI program.

This is end of the Oracle Database Software Installation. In our upcoming article we will be covering how to create database using DBCA and how to Start-up and Shutdown Oracle Database. Please stay tuned…!!!

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Narad Shrestha
He has over 10 years of rich IT experience which includes various Linux Distros, FOSS and Networking. Narad always believes sharing IT knowledge with others and adopts new technology with ease.

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69 thoughts on “Oracle Database 11g Release 2 Installation on RHEL/CentOS 6.x/5.x/4.x”

  1. I can’t download Oracle 11g Solaris on website oracle in my country.

    Please help me.

    I’m a student from Cambodia


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