I'm a bit confused.
When upgrading do you initially start the server with a full database but without the contentstore?
In the 4.2 upgrade steps, after you have validated the server runs and you shut it down.
I think its says to deploy customizations & connect to a backup of the production database and restart the server using an empty alf_data.
After you verify the customizations & the database you shutdown and then copy over alf_data.
So you would initially start the server with a full database but without the contentstore?