centos oracle 11g installation

CentOS 7 is one of the most widely used Linux operating systems today. For many businesses, Oracle Database is one of the most common enterprise-level databases. This article will provide you with the steps required to set up an Oracle 11g database and install it using CentOS 7.

Installing Oracle 11g

Before you start installing Oracle 11g, make sure you have obtained the correct version of Oracle installation media, such as oracle-11.2.0.4-1.x86_64.rpm. The downloaded installation media should be in a directory on your hard drive.

Before you start installing Oracle 11g, make sure you have an X server installed on your CentOS 7 system. If your Linux server does not have an X server, please use the following command to install the system, but some additional software packages and components still need to be installed for use by the Oracle database.

The following are the software packages and commands that require additional installation:

Install grep, ksh, mkisofs, sysstat

sudo yum groupinstall "GNOME Desktop"

1. Set kernel parameters and user account

Before starting the Oracle database, several operating system kernel parameters need to be set. Edit the /etc/sysctl.conf file and add the following parameters:

2. sudo yum install -y grep ksh mkisofs sysstat

Save and close this file. Execute the following command to reset the kernel parameters:

fs.file-max = 6815744
kernel.sem = 250 32000 100 128
kernel.shmmni = 4096
kernel.shmall = 1073741824
kernel.shmmax = 4398046511104
kernel.panic_on_oops = 1
net.core.rmem_default = 262144
net.core.rmem_max = 4194304
net.core.wmem_default = 262144
net.core.wmem_max = 1048576
net.ipv4.conf.default.rp_filter = 2
net.ipv4.conf.all.rp_filter = 2

Set up user account

In order to install and run Oracle database normally, you need to create a user account named "oracle". Before installing the oracle account, make sure the required packages are enabled on your system.

Enter the following command to create the oracle account and assign groups and permissions to it:

sudo sysctl -p

Create the installation directory

You need to create an oracle directory in which to install Oracle Database software. This directory must be created by the oracle user and must have the correct permissions. Let’s create a directory called /u01/app/oracle and assign it to the oracle user:

sudo useradd -m -d /home/oracle -s /bin/bash oracle
sudo passwd oracle
sudo groupadd oinstall
sudo groupadd dba
sudo usermod -aG oinstall oracle
sudo usermod -aG dba oracle

Before installing Oracle 11g, there are some environment variables that need to be set. Please edit the oracle user's .bash_profile file and add the following entries:

sudo mkdir -p /u01/app/oracle
sudo chown -R oracle:oinstall /u01
sudo chmod -R 775 /u01

Execute the following command to override the environment variable changes on your .bash_profile file:

# Oracle Settings
export TMP=/tmp
export ORACLE_HOSTNAME=localhost.localdomain
export ORACLE_UNQNAME=orcl
export ORACLE_BASE=/u01/app/oracle
export ORACLE_HOME=$ORACLE_BASE/product/11.2.0/dbhome_1
export ORACLE_SID=orcl
export PATH=$PATH:$HOME/bin:$ORACLE_HOME/bin
export LD_LIBRARY_PATH=$ORACLE_HOME/lib:/lib:/usr/lib
export CLASSPATH=$ORACLE_HOME/JRE:$ORACLE_HOME/jlib:$ORACLE_HOME/rdbms/jlib

Install Oracle 11g

The final step is to install the Oracle database software. First log in to the system as the root user, then switch to the oracle user and start the Oracle installer using the following command:

source ~/.bash_profile

At this point, please wait for the Oracle installer to automatically perform its initial tasks, which may take a while. Once all tasks of the installer are completed, you should be able to start and connect to the Oracle database.

Summary

In this article, we introduced how to install and configure Oracle 11g database using CentOS 7 operating system. We describe the packages and components that must be installed and explain some of the steps you must take to prepare your system. By following the steps provided in this article, you will be able to successfully install Oracle database on CentOS 7.

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