During installation the user that is installing the

During installation, the user that is installing the software should have the OINSTALL
group as its primary group, and it must be a member of the operating system groups
appropriate for your installation. For example:
# /usr/sbin/usermod -g oinstall -G dba,asmdba,backupdba,dgdba,kmdba,racdba[,oper]
oracle
Creating Operating System Oracle Installation User Accounts
5-14 Oracle Database Installation Guide

5.4.5 Checking Resource Limits for Oracle Software Installation Users
For each installation software owner user account, check the resource limits for
installation.
On Oracle Linux systems, Oracle recommends that you install Oracle Preinstallation
RPMs to meet preinstallation requirements like configuring your operating system to
set the resource limits in the limits.conf file. Oracle Preinstallation RPM only
configures the limits.conf file for the oracle user. If you are implementing Oracle
Grid Infrastructure job role separation, then copy the values from the oracle user to
the grid user in the limits.conf file.
Use the following ranges as guidelines for resource allocation to Oracle installation
owners:
Table 5-1 Installation Owner Resource Limit Recommended Ranges
Resource Shell Limit Resource Soft Limit Hard Limit
Open file descriptors nofile at least 1024 at least 65536
Number of processes
available to a single user
nproc at least 2047 at least 16384
Size of the stack segment
of the process
stack at least 10240 KB at least 10240 KB, and at
most 32768 KB
Maximum locked
memory limit
memlock at least 90 percent of the
current RAM when
HugePages memory is
enabled and at least
3145728 KB (3 GB) when
HugePages memory is
disabled
at least 90 percent of the
current RAM when
HugePages memory is
enabled and at least
3145728 KB (3 GB) when
HugePages memory is
disabled
To check resource limits:
1.
Log in as an installation owner.
2.
Check the soft and hard limits for the file descriptor setting. Ensure that the result
is in the recommended range. For example:
$ ulimit -Sn
1024
$ ulimit -Hn
65536
3.
Check the soft and hard limits for the number of processes available to a user.
Ensure that the result is in the recommended range. For example:
$ ulimit -Su
2047
$ ulimit -Hu
16384
4.
Check the soft limit for the stack setting. Ensure that the result is in the
recommended range. For example:
Creating Operating System Oracle Installation User Accounts
Configuring Users, Groups and Environments for Oracle Grid Infrastructure and Oracle Database 5-15

$ ulimit -Ss
10240
$ ulimit -Hs
32768
5.
Repeat this procedure for each Oracle software installation owner.
If necessary, update the resource limits in the /etc/security/limits.conf
configuration file for the installation owner. However, the configuration file may be
distribution specific. Contact your system administrator for distribution specific
configuration file information.