How to Troubleshoot Oracle 11g installation in RHEL?

In my previous post, I discussed regarding the installation process of Oracle 11g EE in RHEL machine. But while installation of any product, we may face few issues.

Today i'll be discussing the issues which I faced while installing Oracle 11g DB in RHEL machine.

I am mentioning the issues which I face while installation. You may or may not get these issues. There might be chances that  you might get some different issues as well.

Lets discuss the issues one by one.

Issue 1 : After modification, the machine got slow

Solution - There might be different cases for the above issue. But for me, the issue was in /etc/hosts file one entry was missing. So I added the below entry

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4

::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

After installation, both lines should be there, but there might be chances that the second line is not there. If second line is not there, then add the second line. This will resolve the issue for slow down of system.

Issue 2 - While installation or executing the installer, you might get 

[INS-35172] Target database memory (3096MB) exceeds the systems available shared memory ({0} MB) solution

Solution -

For the above issue, increase the memory of the tmpfs (temporary file system)

Execute the below commands to allocate memory to tmpfs -

df -h /dev/shm

umount tmpfs

mount -t tmpfs shmfs -o size=4G /dev/shm

df -h /dev/shm

You can allocate memory as per your need. For me I allocated 4GB of memory to tmpfs.

Issue 3 - While installation or executing the installer, you might get 

[FATAL] [INS-13013] Target environment do not meet some mandatory requirements.

   CAUSE: Some of the mandatory prerequisites are not met. See logs for details. /tmp/OraInstall2017-02-23_12-09-38PM/installActions2017-02-23_12-09-38PM.log

Solution - 

In this case, go to the log file and check the issue. For my case, the issue with the UID. While installing DB, Oracle checks whether that multiple users do not exist with the same user id (UID).

I checked the log file and found 

If you are getting the same issue, go to /etc/passwd file and check the UID. If any other entry is present with the same UID, remove the line.

For me I deleted lodadmin:x:0:0:lodadmin:/home/lodadmin:/bin/bash from /etc/passwd file as the same UID is for root:x:0:0:root:/root:/bin/bash

Issue 4 - If firewall is not installed

Solution -

If firewall is not installed in your system, you cannot disable it. So before disabling the firewall, install the firewall and save the iptable by using below commands -

systemctl stop firewalld

systemctl mask firewalld

yum install iptables-services

systemctl enable iptables

systemctl [stop|start|restart] iptables

service iptables save

I hope the above solutions will help you to install Oracle 11g EE DB successfully in your system.