Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Josh Berkus <josh@agliodbs.com> writes:
>> This is an anti-wraparound vacuum, so it could have something to
>> do with the hint bits. Maybe it's setting the freeze bit on
>> every page, and writing them one page at a time?
>
> That would explain all the writes, but it doesn't seem to explain
> why your two servers aren't behaving similarly.
One was bulk-loaded from the other, or they were bulk-loaded at
different times? Or one had some other activity that boosted the
xid count, possibly in another database?
-Kevin