This document aims to provide the installation guide for the Oracle Database 11g client on the HP-UX-90 platform. Through this guide, users will learn the detailed steps and considerations for installing the Oracle 11g database client on the HP-UX-90 operating system. Installing the Oracle database client is a crucial step in communicating and managing the Oracle database. In the HP-UX-90 environment, it is essential to follow the prescribed steps to ensure the stability and security of the system. This guide will cover the necessary prerequisites, common issues that may arise during the installation process, and their solutions. Familiarizing and adhering to these guidelines will help users successfully complete the installation of the Oracle 11g database client on HP-UX-90.