Kernel Parameters - Oracle

In this third part of a five-part article series on installing Oracle Database XE, you'll begin the installation process on a Linux platform. This article is excerpted from chapter 27 of the book Beginning PHP and Oracle: From Novice to Professional, written by W. Jason Gilmore and Bob Bryla (Apress; ISBN: 1590597702).

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By: Apress Publishing

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November 11, 2010

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For Oracle Database XE to install and run successfully, you must ensure that the kernel parameters in Table 27-1 have the corresponding minimum values. The Oracle installer checks these values before installation will proceed.

**Table 27-1.** *Minimum Linux Kernel Parameter Values*
Kernel Parameter	Minimum Parameter Value
semmsl	250
semmns	32000
semopm	100
semmni	128
shmmax	536870912
shmmni	4096
shmall	2097152
file-max	65536
ip_local_port_range	1024–65000

You can confirm these parameters from a shell prompt using thesysctlandegrep commands as follows:

[root@phpxe ~]# /sbin/sysctl -a | egrep 'sem|shm|file-max|ip_local' net.ipv4.ip_local_port_range = 1024 65000 vm.hugetlb_shm_group = 0
kernel.sem = 250 32000 100 128 kernel.shmmni = 4096
kernel.shmall = 2097152
kernel.shmmax = 2147483648
fs.file-max = 65536
[root@phpxe ~]#

The kernel parameterssemmsl,semmns,semopm, andsemmnicorrespond to the four values in thesysctloutput for parameterkernel.sem. Many of these parameters will already be at least set at their minimum values. For those parameters that need to be changed, edit the file/etc/sysctl.conf and change the parameters to these minimum values. You can change these values in the running kernel immediately by running the command
/sbin/sysctl -p. These values will be set automatically in the future when your workstation starts.

Please check back next week for the continuation of this article.