No reply after 10 days ? What is the purpose of this forum ?!
This is not a commercial software and there is no official support. Everyone here is volunteer helping the community if possible. I have seen your question, but i have no clue what this file is. Maybe you can stop Openfire and try moving it out and then see if Openfire works correctly (maybe do full backup first).
I'm sorry for sounding rude. I've searched for any info about this file format and its only mentioned on Oracle's website that its just another format of database and that it can hold anything, including multimedia files.
I'm guessing that this file contains binary data of sorts, or perhaps the RRD tool database that's used in the monitoring plugin. I'm not aware of any problems related to this - keep an eye on the file size, but unless it exponentially starts growing, there's nothing to worry about.
10 days later and the files are still pretty much the same - LOBS file still sitting at 20 Gigabytes while main DB is 59 Megabytes.
C:\Program Files (x86)\Openfire\embedded-db>dir
Volume in drive C is System
Volume Serial Number is C4E5-A493
Directory of C:\Program Files (x86)\Openfire\embedded-db
28/04/2017 00:03 <DIR> .
28/04/2017 00:03 <DIR> ..
28/04/2017 00:35 16 openfire.lck
18/04/2017 22:03 19,970,326,528 openfire.lobs
28/04/2017 11:13 273,676 openfire.log
28/04/2017 00:03 105 openfire.properties
28/04/2017 00:00 59,324,404 openfire.script
28/04/2017 00:02 <DIR> openfire.tmp
5 File(s) 20,029,924,729 bytes
3 Dir(s) 23,633,252,352 bytes free
I have Monitoring plugin installed and enabled logging on my test server, which is used very rarely to send a few test messages. In the embedded-db folder i don't have openfire.lobs, but i do have openfire.log which seems to contain messages. When server is offline it starts with
/*C8*/SET SCHEMA PUBLIC
DELETE FROM OFRRDS WHERE ID='sessions'
INSERT INTO OFRRDS VALUES('sessions',1
So it does look like RRD table to save conversations. I have installed Monitoring plugin not so long ago, so maybe lobs was some extension in the past. Mine logs file is at 10 MB with a very rare usage. So i can see how this can grow to gigs on a production server (that's why we don't have it enabled on our production server).