Tom Lane wrote:

> Also you might want to look into how you got into a situation where
> you have an anti-wraparound vacuum that's taking so long to run.

If there are ALTERs running all the time, regular (non-anti-wraparound)
vacuums would be canceled and never get a chance to run.  Eventually,
autovacuum decides it's had enough and doesn't cancel anymore, so
everyone else gets stuck behind.

-- 
Álvaro Herrera                https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services


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