Has anybody encountered any issue regarding upgrading from to My boss does not want to spend the time on testing the upgrade (I thought I definitely should), so I try to avoid any known issues.

Also, when running DB upgrade assistant, if I have a 8i DB with 10GB, do I need to ensure I have at least 10GB free space available for it to use as temp storage? In other words, does it convert the DB on the spot or convert by copying/modifying piece by piece?