Is it the safe and preferred way to use 'upgrade=true'
for derby db upgrade from 10.5 to 10.11?
This is because I read on some mailing list
that this option should not be used in
Yes, that's the right way to upgrade. Please see the section
titled "Upgrades" in the Derby Developer's Guide. On what mailing
list did you see this warning and what was the issue which caused
someone to give that advice?