Disclaimer: I do not have any relstorage site on production right now...
This rings me a bell, try to check:
- RelStorage: packing growth Databaze size quickly, something wrong?
- relstorage_packer · PyPI
- [Plone-IT] Garbage collection - RelStorage + PostgreSQL
IIRC the tables object_ref object_refs_added will grow quite a lot.
I think it is quite usual to truncate them from time to time.
They will be anyway recreated at the next pack (adding some more time to the packing process).