locatedb size cc

locatesize.txt

As mentioned by SHW, agedu indeed created an index. I thought I'd share
another way to create an index, after reading about locatedb. You can
create your own version of a locatedb from du output:

du | awk '{print $2,$1}' | /usr/lib/locate/frcode > du.locatedb

awk rearranges the du output to have filenames first, so that frcode works right.
Then use locate with this database to quickly report disk usage:

locate --database=du.locatedb pingus

You can expand this to suit your needs. I think it's a nice use of locatedb.