Re: Diagnosing a massive toast file

Wells Oliver <wells.oliver@gmail.com> writes:
> As a follow up, n_dead_tup from pg_stat_sys_tables for this TOAST table is
> 7447444, live tuples, 623982, and tup_del 20823469. vacuum_count is 0.

> Why can't I free those rows up?

Old open transaction somewhere (possibly a prepared transaction?).
Or a replication slot that's holding back the xmin horizon due to
not keeping up.

            regards, tom lane