Unexpected data in swap partition

RAM 8 GB, swappiness 1.

I updated from digiKam 4 to digiKam 5 and set up the database of my photos from scratch (about 40 MB). RAM usage went up to 3.2 GiB (I had expected more). At the same time my swap partition got 880 kiB, not that much for sure. But why is there any data at all with such a lot of RAM unused?

Volker

Sorry, falsche Sprachgruppe. Ich poste in der englischsprachigen.

Volker