I had a problem, that not all files were showed from miniDLNA.
I checked the files, but all files were on their place, none were missing.
I checked the permissions of share, but they were right.
All clients had the same problem, so I started to think, the problem comes from miniDLNA.
Finally I tried this solution & worked:
from Putty SSH client I tried this:
The files.db was recreated, and all the files were showed in all DLNA clients.
I hope this will help other users, if they have the same problem.