Introduction: Oracle AI Database 26ai, released in October 2025, is a long-term support release that embeds AI capabilities directly into data management, succeeding and replacing 23ai. In this article, we will see how to upgrade the database from 19c to 26ai step by step. We will use autoupgrade.jar method for upgrade. Prerequisites: 19c binary installed with database. 26ai binary installed without database. Java version should be 8 or later. Download latest autoupgrade.jar file. Click here Sufficient disk space for tablespace & archive growth. Minimum 6 hrs downtime for Production database. Environment: Source Database Hostname orcl.oraeasy.com Database Name CDBORCL Database Version 19c(19.28) Oracle Home /u01/app/oracle/product/19c/dbhome_1 Datafile Location /u01/app/oracle/oradata/ORCL Target Database Data...