Magento upgrade takes too long and never completes

Question

I am upgrading magento from 1.4.0.1 to 1.7.0.2. Initially there were some errors; after fixing those, now the upgrade is running for 5 hours and never completes. No error is

Answer 1

How big is the current (1.4.0.1) database? Recently when I had to upgrade 7GB database it took whole weekend on local server - the reason of such long process is that version 1.6 has new indexers and the database structure was rebuild - installation scripts which are meant to be fired upon first load of updated code are droping lot of foreign keys and creating new ones with lot of constraints.