[Oracle DataBase Server 12.2 Installation on Oracle Linux 7.4]: Configuring System Users, System Parameter Settings


Creating users and groups

Create groups:

# groupadd -g 1000 oinstall
# groupadd -g 1001 dba
# groupadd -g 1002 oper

Create user oracle12, specify that he will be in groups dba and oinstall and his home directory will be /home/oracle12

# useradd \
-g oinstall \
-G dba,oper \
-d /home/oracle12 \
-m oracle12

Set password for user oracle12

# passwd oracle12


Changing kernel parameters and account parameters with database administrator rights

# echo 2076311552 > /proc/sys/kernel/shmmax

# echo 6815744 > /proc/sys/fs/file-max
# echo 1048576 > /proc/sys/fs/aio-max-nr


# echo 262144 > /proc/sys/net/core/rmem_default
# echo 4194304 > /proc/sys/net/core/rmem_max

# echo 262144 > /proc/sys/net/core/wmem_default
# echo 1048586 > /proc/sys/net/core/wmem_max



Apply kernel parameters without rebooting with the following command:

	# sysctl -p

View the result:

# sysctl -a | grep file-max


  1. Edit the /etc/security/limits.conf file

    	# vi /etc/security/limits.conf

Add the following lines

############################################
#### Settings required for Oracle 12

oracle12 soft nproc 2047
oracle12 hard nproc 16384
oracle12 soft nofile 1024
oracle12 hard nofile 65536
oracle12 soft stack 10240
oracle12 hard stack 32768

############################################


  1. Edit the /etc/pam.d/login file

    	# vi /etc/pam.d/login

Add the following lines

############################################
#### Settings required for Oracle 12

session required pam_limits.so
############################################


  1. Edit the /etc/profile file

    vi /etc/profile

At the end of the file before the following commands.

unset i
unset pathmunge

Add:

###########################################

#### Shell limits for Oracle 12 user accounts

if [ $USER = "oracle12" ]; then
ulimit -u 16384 -n 65536
fi
############################################


  1. Edit the /home/oracle/.bash_profile file

    su - oracle12


$  vi ~/.bash_profile

After

# User specific environment and startup programs

Add

############################################

#### Oracle 12 Parameters

umask 022

export ORACLE_BASE=/u01/oracle
export ORACLE_HOME=\$ORACLE_BASE/database/12.2
export ORACLE_SID=orcl12
export ORACLE_UNQNAME=orcl12
export NLS_LANG=AMERICAN_AMERICA.AL32UTF8
export NLS_DATE_FORMAT="DD.MM.YYYY HH24:MI:SS"

export PATH=$PATH:$ORACLE_HOME/bin
export LD_LIBRARY_PATH=\$ORACLE_HOME/lib

export NLS_DATE_FORMAT='dd/mm/yyyy hh24:mi:ss'

alias sqlplus='rlwrap sqlplus'
alias rman='rlwrap rman'

############################################

Apply variables defined in the .bash_profile file to the current bash session with the following command:

$ source ~/.bash_profile