This document provides a comprehensive guide on the step-by-step process of upgrading from DB2 version 10.4 to version 11.1. It outlines the necessary procedures and considerations to ensure a successful upgrade. The document begins by emphasizing the importance of backing up all databases and configurations before proceeding with the upgrade. It then proceeds to describe the specific steps involved in the upgrade process, including the installation of the new version, migration of existing data, and post-upgrade tasks such as verifying the integrity of the database and updating any dependent applications. Additionally, it offers troubleshooting tips and recommendations for resolving potential issues that may arise during the upgrade. This detailed guide will assist users in seamlessly transitioning to the newer version of DB2 while maintaining the integrity of their data.