Install Oracle Database 19C on Red Hat Enterprise Linux — RHEL 8

Before starting the installation, you might prepare your environment following the optional steps below:

1. Install required packages
   $ yum install bc binutils elfutils-libelf elfutils-libelf-devel fontconfig-devel glibc glibc-devel ksh libaio libaio-devel libgcc libnsl librdmacm-devel libstdc++ libstdc++-devel libX11 libXau libxcb libXi libXrender libXrender-devel libXtst make net-tools nfs-utils python3 python3-configshell python3-rtslib python3-six smartmontools sysstat targetcli unzip
2. Creating user and group
   # This steps will be created by the Oracle Database Preinstallation RPM
   $ groupadd -g 1001 oinstall
   $ groupadd -g 1002 dba
   $ groupadd -g 1003 oper
   $ useradd -g oinstall -G dba,oper oracle
   $ passwd oracle
3. Set environment variables for Oracle user
   $ vi ~/.bash_profile
   umask 022
   export ORACLE_SID=ORCLCDB
   export ORACLE_BASE=/opt/oracle/oradata
   export ORACLE_HOME=/opt/oracle/product/19c/dbhome_1
   export PATH=$PATH:$ORACLE_HOME/bin
   $ source ~/.bash_profile

Starting the Installation Process:

1. Downloading the Oracle Database Preinstallation RPM
   https://www.oracle.com/database/technologies/oracle-database-software-downloads.html
2. Installing the RPM package
   $ dnf -y install https://yum.oracle.com/repo/OracleLinux/OL8/appstream/x86_64/getPackage/oracle-database-preinstall-19c-1.0-1.el8.x86_64.rpm
3. To configure a sample Oracle Database you can execute the following service configuration script as root
   $ /etc/init.d/oracledb_ORCLCDB-19c configure
4. Test database connection
   $ sqlplus / as sysdba
   SQL> exit

Resources:

https://docs.oracle.com/en/database/oracle/oracle-database/19/ladbi/index.html