This may also be of interest to you, but checking official docs as Adrian recommended is best. https://why-upgrade.depesz.com/show?from=9.4.2&to=9.6.12&keywords=
- PostgreSQL upgrade from 9.4.2 to 9.6.12 Ashwini Singh
- Re: PostgreSQL upgrade from 9.4.2 to 9.6.12 Adrian Klaver
- Re: PostgreSQL upgrade from 9.4.2 to 9.6.12 Jonathan Harden
- Re: PostgreSQL upgrade from 9.4.2 to 9.6.12 Michael Lewis
