I use in firefox an extension named "SQLite Manager" (but then my SQL skills are non-existent so I don't know if this is what you are looking for)...My meta.db is over >110MB as you can see from the ls -l I posted so 40MB is pretty ok
I'm running the grep now...let's see what happens... Edit: Grep doesn't do anything for me too...Just keeps running...
You have these file access problems because the /home/user/.cache/tracker attributes do not allow listing of the directory to anyone but users who belong to group "metadata":
Access to the file/directory is of course possible when you are root.
(and for the record, of course I also run my device in open mode, else all this stuff wouldn't be possible)