https://bugs.kde.org/show_bug.cgi?id=437754
--- Comment #3 from tagwer...@innerjoin.org ---
(In reply to Martin Steigerwald from comment #2)
> % balooctl indexSize
> File Size: 8,12 GiB
> Used:      77,17 MiB
There's some analysis/discussion/confusion about the percentages here:

    https://bugs.kde.org/show_bug.cgi?id=354636#c10

I think the "used" sizes are believable. I have copied/compressed a test index
with

    mdb_copy -n -c index index.new

(from lmdb-utils) and this changes "indexSize" details from:

    File Size: 2,28 GiB
    Used:      18,99 MiB

               PostingDB:       4,89 MiB    25.735 %
              PositionDB:       4,92 MiB    25.921 %
                DocTerms:       2,47 MiB    13.001 %
        DocFilenameTerms:       1,70 MiB     8.969 %
           DocXattrTerms:       4,00 KiB     0.021 %
                  IdTree:     240,00 KiB     1.234 %
              IdFileName:       1,94 MiB    10.204 %
                 DocTime:       1,29 MiB     6.809 %
                 DocData:       1,53 MiB     8.044 %
       ContentIndexingDB:            0 B     0.000 %
             FailedIdsDB:            0 B     0.000 %
                 MTimeDB:      12,00 KiB     0.062 %

to:

    File Size: 19,37 MiB
    Used:      18,99 MiB

               PostingDB:       4,89 MiB    25.735 %
              PositionDB:       4,92 MiB    25.921 %
                DocTerms:       2,47 MiB    13.001 %
        DocFilenameTerms:       1,70 MiB     8.969 %
           DocXattrTerms:       4,00 KiB     0.021 %
                  IdTree:     240,00 KiB     1.234 %
              IdFileName:       1,94 MiB    10.204 %
                 DocTime:       1,29 MiB     6.809 %
                 DocData:       1,53 MiB     8.044 %
       ContentIndexingDB:            0 B     0.000 %
             FailedIdsDB:            0 B     0.000 %
                 MTimeDB:      12,00 KiB     0.062 %

Which points at loads of "empty space" created during the deletions/status.
This is on ext4, after having created 50000 files and deleted 20000. I will try
the same on BTRFS

Whether this helps any...?

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