What is in serviio/library/search in linux version?

Hi

I'm using the linux version of serviio, and i have problems with indexing a big music and film library, which is maybe connected to my question: in serviio/library/search folder i have file with name _t.fdt which is grown to 2,6 gbytes! What is this file?

Ok i see i need to find another dlna server... this thing loads about 60 files into database, then stops, just using the cpu but not adding anything to the DB. No error message in serviio.log, nor in derby log... If i restart serviio (by killing the server, as -stop message doesn't shut it down, just writes some messages in log) it loads few files again, then stops again...

[zip]

It's an index file for search index. It should not be so large by any means, unless you have tens of thousands files.

I have about 14000 files. But the indexing wasnt worked, as always the same happened as i wrote above, and what is written in another topic too. (servio index few files, then freeze and using 100% cpu).
Now i use minidlna instead, that indexes everything correctly, and it have about 60 indexed file/second rate instead of serviio's 4 file/second, on the same machine.