Re: strange 'vacuum verbose analyze' behaviour

Oleg Bartunov <oleg@sai.msu.su> writes:
> Day ago we run 'vacuum verbose analyze;' and now we're observing
> strange output (see below). We see many repeated passes through the
> table 'usno' and all indices (2).

Nothing strange about it: that's how vacuum deals with large tables.
You can reduce the number of passes over the indexes by increasing
maintenance_work_mem (aka vacuum_mem).  It looks like you have that
set to 16MB, which is enough to hold about 2.79M 6-byte CTIDs.  When
that fills up, we have to go and clean out the corresponding index
entries before we resume scanning the heap.

It is a bit odd that nothing is getting deleted from "ipix_ind" ...
is that a partial index?
        regards, tom lane