I have found that MySQL has stated many incompatibilities and know issues (a long list) in the MySQL version 5.0, 5.1, 5.5, 5.6 and 5.7.
For PostgreSQL, it seems I can't find the list (it just say see the Appendix E / release notes). I think it is a plus for PostgreSQL if it has few incompatibilities between major versions.
By the way, for in-place major version upgrade (not dumping DB and import again), MySQL is doing a better job in here.
Please share your thought, thanks.
pg_upgrade will do an in-place upgrade if you wish. It is somewhat risky if not done using a COPY (it can either copy or not, as you wish) but it's considerably faster than a dump/restore and is "in-place."
