Seb <spluque(at)gmail(dot)com> writes:
> I recently upgraded a server from 9.4 to 9.5 (Debian) via
> pg_upgradecluster. The upgrade finished well, and so far the databases
> in the upgraded cluster seem in good form. However, I noticed a
> dramatic reduction in the size of the dump created by the new server.
> One of the databases was 34G when dumped by the 9.4 server is now dumped
> at 1.1G in the new 9.5 version (using pg_dump -Fc in both cases). What
> has caused such remarkable improvement?!
That seems really fishy. Better check to see if all your data
is still there :-(
regards, tom lane