How to Install and Getting Started on Oracle 11 G R2 Database for RHEL6 Linux

April 12, 2012 | By Duchateaux.

This an Easy and Step-by-Step Guide to Install and Quickly Getting-Started the Oracle 11g R2 Database on a Red Hat Enterprise Linux 6.x System.

To have a Nice Journey through this WoWtUt Relax and Take the Time of Reading, Understanding and Executing Carefully the Instructions Contained here.

To the Article Bottom you Find Links to Oracle 11g Database Detailed Troubleshooting Guides.

Download the Database Release
Oracle 11g R2
Open a Terminal Window
(Press “Enter” to Execute Commands)
Login as SuperUser:
```
su 
```
If Got “User is Not in Sudoers file” then see: How to Enable sudo
Make Network Configuration
Check you hostname and IP is on /etc/hosts.

Get your hostname:
```
hostname
```
Get your IP:
```
/sbin/ifconfig
```
You will Find your Ip under the Output “lo” Section.

Check if Hostname and IP are already inserted into the Enabled Hosts File.
```
cat /etc/hosts
```
If It’s Not Present then Insert it!
```
nano /etc/hosts
```
Insert: .

Example: ‘127.0.0.1 localhost.localdomain localhost’

Ctrl+Shift+v to Paste Content on nano
Ctrl+x to Save and Exit from nano Editor :)

Add you Host IP to the List of Hosts Granted of Connection with the X Server
```
xhost +yourIP
```
Example: #xhost +127.0.0.1

If you Do Not Dispose of RHEL Subscription.

How to Setup YUM

Detailed Instructions for How to Setup YUM for Un-subscribed RHEL Users

Install dependencies

sudo yum install binutils glibc compat-libstdc++-33 glibc-common 

glibc-devel glibc-headers elfutils-libelf elfutils-libelf-devel 
/nelfutils gcc gcc-c++ ksh libaio libaio-devel libgcc libstdc++-devel 

make numactl-devel sysstat mksh

Add Groups and User

groupadd -g 502 oinstall

groupadd -g 503 dba

groupadd -g 504 oper

groupadd -g 505 asmadmin

useradd -u 502 -g oinstall -G dba,asmadmin,oper -s /bin/bash -m oracle

passwd oracle

Take Note of the oracle User Pass :)

Create the directories where Oracle will be installed and give right ownership and permission
```
mkdir -p /u01/app/oracle/product/11.2.0/
```
```
chown -R oracle:oinstall /u01
```
```
chmod -R 775 /u01
```

Set Kernel’s Parameters
```
nano /etc/sysctl.conf
```
Then hit Ctrl+x to Save and Exit from nano EditorAdd or amend the following lines in the /etc/sysctl.conf file.

#### Oracle 11g Kernel Parameters ####
fs.suid_dumpable = 1
fs.aio-max-nr = 1048576
fs.file-max = 6815744
kernel.shmall = 818227
kernel.shmmax = 4189323264
kernel.shmmni = 4096
# semaphores: semmsl, semmns, semopm, semmni
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=1048576

Comment out these lines below than give an error
#net.bridge.bridge-nf-call-ip6tables = 0
#net.bridge.bridge-nf-call-iptables = 0
#net.bridge.bridge-nf-call-arptables = 0
```
nano /etc/security/limits.conf
```
Add the following lines to the /etc/security/limits.conf file.

#### oracle User Settings 4 Oracle 11g ####
/noracle soft nproc 2047
/noracle hard nproc 16384
/noracle soft nofile 1024
/noracle hard nofile 65536
/noracle soft stack 10240
```
nano /etc/selinux/config
```
Disable Secure Linux by editing the /etc/selinux/config file, making sure the SELINUX flag is set as follows.
```
SELINUX=disabled
```
Run the following command to Load the New Kernel Parameters.
```
/sbin/sysctl -p
```

Unzip the Oracle 11g Database, Set oracle as Owner and Move it into the oracle’s Home

cd </path/2>

unzip linux_11gR2_database_1of2.zip

unzip linux_11gR2_database_2of2.zip

chown -R oracle:oinstall database

mv database /home/oracle

Add Paths to oracle’s .bashrc
Login as Oracle
```
su oracle
```
Edit .bashrc file
```
nano ~/.bashrc
```
Insert:

# Oracle Settings
TMP=/tmp; export TMP
TMPDIR=$TMP; export TMPDIR
ORACLE_HOSTNAME=myHOSTNAME; export ORACLE_HOSTNAME
ORACLE_UNQNAME=DB11G; export ORACLE_UNQNAME
ORACLE_BASE=/u01/app/oracle; export ORACLE_BASE
ORACLE_HOME=$ORACLE_BASE/product/11.2.0/dbhome_1; export ORACLE_HOME
ORACLE_SID=dbSID; export ORACLE_SID
PATH=/usr/sbin:$PATH; export PATH
PATH=$ORACLE_HOME/bin:$PATH; export PATH
LD_LIBRARY_PATH=$ORACLE_HOME/lib:/lib:/usr/lib; export LD_LIBRARY_PATH
CLASSPATH=$ORACLE_HOME/jlib:$ORACLE_HOME/rdbms/jlib; export CLASSPATH

Replace [HOSTNAME] with IP and [DBSID] with SID Name
In this Example Respectively:
- HOSTNAME = 127.0.0.1
- DBSID = SID
Load New .bashrc Settings.
```
bash
```
Latest and Optional to Add Cross-Shell Compatibility edit also oracle’s .bashrc.
```
nano ~/.bashrc
```
Add as Latest Entry the Line.
```
bash
```

Install the Oracle 11g Software
```
cd /home/oracle/database
```
```
./runInstaller
```
If you Get: “Check if the DISPLAY variable is set. Failed”. Look Link Below.

Link2+ Oracle 11g Database Troubleshooting.

On the first screen If you Do Not Dispose of an Oracle Subscription Just Leave Blank eMail and Un-Check the Demand of Security Update Support then Click on Next

Then Confirm on Warning and Follow.

On “Select Installation Option” Select “Install database software only” and Click on Next

On Step 3 Leave Default “Single instance database installation” and Click on Next

On Step 4 Select your Language and Click on Next
On Step 5 Leave Default Enterprise Edition and Click on Next

On “Installation Location” Set All As Here Below and Click on Next
- Oracle Base: /u01/app/oracle
- Software Location: /u01/app/oracle/product/11.2.0/dbhome_1
.

These are the Same Settings Inserted into the .bashrc File…

On “Create Inventory” if you Setup the Path on .bashrc Like Here Leave Default and Click on Next

On “Operating System Groups” if you Setup the Path on .bashrc Like Here Leave Default and Click on Next

On “Prerequisite Checks” you will Get Easily a “Warning Message” about some Missing Requirements.

Just Check: “Ignore All” and Follow Up with Installation…

On the “Summary” Click on “Save Response File” to Take Note of Settings and then Click on Finish

The Installation Product Procedure should Start… Wait Until Successful Achievement.
Right Before the End of Process a Pop-Up Window will Show the Path to Two Configuration Scripts you Need to Execute on Terminal!

Latest Oracle Should Confirm you of a Successful Installation End.)
How to Create and Run an Oracle 11g Listener:

Oracle 11g DB Listener Guide

Make Oracle Listener

Create an Oracle 11g Database

Make Oracle Db

After you have Access to the “Enterprise Manager” on Browser by the URL shown on the Latest Screen.
On a Localhost for Example you Should Access the Enterprise Manager by the Address:

https://127.0.0.1:1158/em

And you can Login with:
Username: SYS
Password: oracleDatabasePassword
From the Drop-down below Select >> Connect as SYSDBA
You Should be able to Access the Database by the Enterprise Manager!