Hasan, When you showing you are referring to Vision DB on some screens (example accesing General Ledger), but we have set up with PROD db only. Want to see existing data using Vision DB. Now if I uninstall and install EBS with PROD and Vision DB, will there be any issue with my training? Please advice.

The training assumes you are using PROD db. I may have used Vision screens at some occasions but for all practical purposes PROD db is assumed. If you use Vision DB ythen ou will come across issues as it comes preconfigured and some configuration components cannot be changed. Vision DB is best if you wish to quickly view how Oracle works and it is not a good option if you wish to learn to configure it from scratch. About your question on uninstalling, I did not quite understood it. If you have Vision DB installed and wish to get PROD then simply redo the installation procedure. During the installation the wizard will ask you to select between the two. This time you can select PROD.