RHEL System Configuration Changes for Oracle 10G

Below is a list of RHEL system configuration changes that Oracle 10G requires before it is installed.

First, check the following kernel parameters using the commands below:

/sbin/sysctl -a | grep kernel.shmall
/sbin/sysctl -a | grep kernel.shmmax
/sbin/sysctl -a | grep kernel.shmmni
/sbin/sysctl -a | grep kernel.sem
/sbin/sysctl -a | grep fs.file-max
/sbin/sysctl -a | grep net.ipv4.ip_local_port_range
/sbin/sysctl -a | grep net.core.rmem_default
/sbin/sysctl -a | grep net.core.rmem_max
/sbin/sysctl -a | grep net.core.wmem_default
/sbin/sysctl -a | grep net.core.wmem_max

If any parameters are lower than the examples below, you will have to increase them by editing “/etc/sysctl.conf” file, adding the appropriate lines as expressed below. If the current value is higher, leave it as is.

kernel.shmall = 2097152
kernel.shmmax = 2147483648
kernel.shmmni = 4096
kernel.sem = 250 32000 100 128
fs.file-max = 65536
net.ipv4.ip_local_port_range = 1024 65000
net.core.rmem_default = 262144
net.core.rmem_max = 262144
net.core.wmem_default = 262144
net.core.wmem_max = 262144

Next, edit your “/etc/security/limits.conf” file, adding the following lines:

oracle          soft    nproc           2047
oracle          hard    nproc           16384
oracle          soft    nofile          1024
oracle          hard    nofile          65536

If your current “/etc/pam.d/login” file does not already contain the following line, add it:

session    required     pam_limits.so

Finally, add the following lines to your "/etc/profile" file:

#Tweaks for Oracle
if [ $USER = "oracle" ]; then
    if [ $SHELL = "/bin/ksh" ]; then
    ulimit -p 16384
    ulimit -n 65536
    ulimit -u 16384 -n 65536

These are just the basic steps I take. See the “Oracle Database Installation Guide” for more complete instructions.

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