Installation and Agent Deployment - Expert Oracle Enterprise Manager 12c - page 18

For Oracle Linux 6, you need to install the oracle-rdbms-server-11gR2-preinstall package instead of the
oracle-validated package:

[root@repositorydb ~]# yum install oracle-rdbms-server-11gR2-preinstall

You can also manually download the oracle-validated package for Red Hat Enterprise Linux 5 from the
following link: https://oss.oracle.com/el5/oracle-validated/ .
After you install oracle-validated , you need to set the password for the ORACLE user. Be sure that you also set up
YUM and install the oracle-validated package for the OMS server.

Creating Oracle User and Groups
If you do not want to use the oracle-validated package, you can create the required groups and user manually. Log
in as ROOT and run the following commands:

[root@repositorydb ~]# groupadd oinstall
[root@repositorydb ~]# groupadd dba
[root@repositorydb ~]# useradd -g oinstall -G dba oracle
[root@repositorydb ~]# passwd oracle

After the last command, enter the password for the ORACLE user.

Setting Kernel Parameters
The Oracle Database 11gR2 installer can detect and fix errors on kernel parameters, so you can run the installer and
let it create scripts to set required parameters. If you want to configure kernel parameters without the help of the
installer, make a backup of /etc/sysctl.conf and then use any text editor to edit the file so that it includes lines
similar to the following:

fs.aio-max-nr = 1048576
fs.file-max = 6815744
kernel.shmall = 2097152
kernel.shmmax = 4536870912
kernel.shmmni = 4096
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

These are recommended values for Oracle Database. If any of the current values are bigger than the recommended
value, use the bigger value.

■ Tip on 64-bit linux systems, kernel.shmmax can be set to a maximum of 1 byte less than the physical memory.