This chapter provides an overview of the upgrade process, upgrade environments and the utility used to perform the upgrade. It includes the following topics:

• About Supported Upgrade Paths
• About Using Siebel Expert Services
• About Upgrade Environments
• About the Upgrade Process
• About Midtier-Centric and Mainframe-Centric Upgrades
• About the Database Server Configuration Utility
• About the Siebel Upgrade Wizard and Driver Files
• Job Flow of a Production Database (Mainframe-Centric) Upgrade
• About the Override File
• About the Repository Merge
• About the Siebel Database Server