The Oracle Inventory directory is the central inventory of Oracle software installed on your system. Ensure that the oraInventory path that you specify is in compliance with the Oracle Optimal Flexible Architecture recommendations. The Oracle inventory is one directory level up from the Oracle base for the Oracle software installation and designates the installation owner’s primary group as the Oracle 19c inventory group.

For new installs, if you have not configured an oraInventory directory, then you can specify the oraInventory directory during the software installation and Oracle Universal Installer will set up the software directories for you. For upgrades, the installer detects an existing oraInventory directory from the /etc/oraInst.loc file, and uses the existing oraInventory.Note: If you enable HugePages for your Linux servers, then you should deduct the memory allocated to HugePages from the available RAM before calculating swap space. Between 8 GB and 16 GB: Equal to the size of the RAM.Between 2 GB and 16 GB: Equal to the size of the RAM. Between 1 GB and 2 GB: 1.5 times the size of the RAM.At least 1 GB of space in the /tmp directory required by oracle 19c.

Introduction Oracle 19c server Configuration Checklist for Oracle Database Installation

Oracle 19c rpm installation on linux