[ilyt]

So any DB container by definition would have massively high percentage just because DB app itself is few tens of MB but database data is in tens of gigabytes ?

Seems like really useless metric for containers.

I can get it for OSes (some packages there do manage DB data, and even have option to remove it when removing package) but for container it does seem a bit pointless

[derefr]

No...? Again, we're talking about container images, not containers. Specifically, public container images sitting in registries like Docker Hub. People aren't burning their Postgres data into a container image and then pushing it, public-readable, to an image registry.

(But also, even ignoring that, I believe the metric used by the article is number-of-files, not byte-size. A DB might be large in byte-size, but is usually relatively negligible in number-of-files, usually holding individual table chunk files of 1GB or larger.)