Oracle provides upgrade options and strategies that are designed for your database environment, and an array of tools that automate the Oracle Database upgrade process.

• Overview of Oracle Database Upgrade Tools and Processes
  Review these topics to understand Oracle Database terms, tools and processes.
• Major Steps in the Upgrade Process for Oracle Database
  Oracle Database upgrades consist of six major steps.
• Compatibility and Interoperability Between Oracle Database Releases
  Learn how to understand and avoid compatibility and interoperability issues that can occur because of differences in Oracle Database releases.
• About Running Multiple Oracle Releases
  Run multiple releases using Optimal Flexible Architecture (OFA).
• About Converting Databases During Upgrades
  Review these topics to determine which is the best path for you to select to upgrade Oracle Databases.
• About Upgrading Platforms for a New Oracle Database Release
  Review these topics if you upgrade your operating system or hardware for a new Oracle Database release.
• About Image-Based Oracle Database Installation
  Starting with Oracle Database 18c, installation and configuration of Oracle Database software is simplified with image-based installation.