Quote:
Originally Posted by Comfy.n
I won't be able to describe clearly how this happened, unfortunately, but I remember vaguely I've had a similar experience where I may have clicked inadvertently the button "Queue all books for backup" in menu Library -> Library Maintenance -> Library metadata backup. Picture this happening on a large library: that can run for days and it seems there's no way to stop it.
One has to be very inattentive to hit such a far down button in the menu structure, but sometimes I can be very scatterbrained. Or maybe it was just me changing some custom columns and that can trigger the metadata backup process?
If I recall correctly, I had to use a metadata.db backup to have Calibre running fine again. This happened about 4 months ago. Also, one thing I'm sure is that I wasn't fiddling with RL plugin at that time.
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Note that you can speed up the process by using
calibredb backup_metadata [options] when calibre isn't running. This command updates the OPF files at disk speed instead of 1 OPF every 2 seconds or so. For example, on my system a full OPF backup of a 75000 book library took 11 minutes