Hi Hassan, i have done most of the modules as per the video's with fresh implementation.

Now i want to explore new things from vision db. what options do i have.
1. do i need to do fresh installation by selecting vision db.
2. can i upgrading to vision db keeping all my changes.
Trying to understand what options i have.

1) If you need access to Vision then you need to install Vision. You cannot change Fresh install to Vision. You can create a second virtual machine and install Vision on that. This way you can run one virtual machine at a time. The installation procedure is exactly the same just; choose Vision instead of Fresh. You will need more hard disk space and installation will take longer.
2) Alternatively just stick to Fresh install and try to implement the new features that you want to explore.

Thanks for the info