On Thu, Feb 11, 2021 at 11:49 AM Peter Geoghegan <pg@xxxxxxx> wrote:
On Thu, Feb 11, 2021 at 9:13 AM Don Seiler <don@xxxxxxxxx> wrote:
> My understanding is that these manual VACUUM ANALYZE jobs are not freezing rows that regular autovacuuming would otherwise be doing, which leads up to the big anti-wraparound job.
They will freeze rows, but not aggressively. The antiwraparound vacuum
might block on acquiring buffer pins, low level stuff like that.
Perhaps you should change the vacuum_index_cleanup reloption to 'off'
for the table, but make the scripted overnight vacuums directly
specify INDEX_CLEANUP=on. That way index cleanup would still be
performed for the vacuums that run overnight, though not for the
antiwraparound vacuums, where the overhead may be a real issue.
Thanks for the response, Peter. This table *does* have 14 indexes on it as well, including on GIN index (rest are btree, some are partial indexes). I've had a separate task on the back burner to try to identify any redundant ones.
In the scenario you describe, would we re-enable the routine autovacuuming? I'm assuming so but wanted to make it clear.
Cheers,
Don.
Don Seiler
www.seiler.us
www.seiler.us
