Try a hard link instead of symbolic, I have no issues whatsoever and I use ChuckPa’s DBRepair once a month or so. I’m on Ubuntu and use a hard link for my metadata and database directory and it’s stored on a completely separate drive in my system. My DB is barely over 1GB, 1.2 to be exact.

PhotoTranscoder directory

So I need to hardlink
/Users/bigdave/Library/Application\ Support/Plex\ Media\ Server
to
/Volumes/WD\ Elements/System/Plex\ Media\ Server
Not sure what command you’re using but ln seems to only work with files.
Get a bigger root drive if you’re so sick of it. You could’ve solved this problem yourself a long time ago.
If you’re on Linux
ln -s /pathtofolder/Plex\ Media\ Server /pathtodestination/ (make sure there's no Plex Media Server folder in here)
or just ln for hard link.
We will be addressing this in the next upcoming release. Which should be soon
.