Re: Autovacuum/Analyze Doesn't seem to be running properly

From: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>
To: Chris Kim <christopherkim22(at)gmail(dot)com>
Cc: Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>, pgsql-admin(at)lists(dot)postgresql(dot)org
Subject: Re: Autovacuum/Analyze Doesn't seem to be running properly
Date: 2020-03-04 20:52:56
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

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