Date: Wed, 4 Mar 2020 17:52:56 -0300
From: Alvaro Herrera <alvherre@2ndquadrant.com>
To: Chris Kim <christopherkim22@gmail.com>
Cc: Laurenz Albe <laurenz.albe@cybertec.at>,
	pgsql-admin@lists.postgresql.org
Subject: Re: Autovacuum/Analyze Doesn't seem to be running properly
Message-ID: <20200304205256.GA22843@alvherre.pgsql>
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On 2020-Mar-04, Chris Kim wrote:

> In my testing it looks like pg_stat_reset was ran, but I haven't been able
> to verify this from my logs.
> 
> Is there another way the stats could get reset?

Yes, a crash/restart does that.

> Does autovacuum use the stats from pg_stat_user_table meaning if there 50
> live tuples and 1000 dead tuples, but then the stats are reset, those dead
> tuples would never get cleaned up until there was new activity on that
> table?

That's correct.

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