Comment # 3 on bug 777419 from Vincent Petry

In your case it seems to take a few seconds.

On my system, it takes almost a minute:

# time /usr/bin/update-mime-database "/usr/share/mime"
Unknown media type in type 'all/all'
Unknown media type in type 'all/allfiles'

real    0m45.381s
user    0m0.460s
sys     0m0.196s

This makes it painful to install/upgrade packages especially the ones that have
mime type updates, because it will run update-mime-database for each one of
these packages instead of just once at the very end.
I discovered this by running iotop every time I heard the HDD rattling a lot.

I just upgraded today from openSUSE 13.2 to openSUSE Leap 42.1 using the DVD,
the upgrade took several hours!

Would it be at least possible to defer running "update-mime-database" to the
very end of a zypper/rpm transaction instead of doing it for every package ?