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help / color / mirror / Atom feedFrom: Nathan Bossart <[email protected]>
To: Robert Haas <[email protected]>
Cc: Robert Treat <[email protected]>
Cc: David Rowley <[email protected]>
Cc: Sami Imseih <[email protected]>
Cc: Jeremy Schneider <[email protected]>
Cc: [email protected]
Subject: Re: another autovacuum scheduling thread
Date: Thu, 20 Nov 2025 10:25:37 -0600
Message-ID: <aR9BATffJN-hmQ1w@nathan> (raw)
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On Thu, Nov 20, 2025 at 09:30:42AM -0500, Robert Haas wrote:
> Point being: I think we need to avoid the mindset that we can't be
> stupider than we are now. I don't think there's any way we would
> commit something that is GENERALLY stupider than we are now, but it's
> not about averages. It's about whether there are specific cases that
> are common enough to worry about which end up getting regressed. I'm
> honestly not sure how much of a risk that is, and, again, I'm not
> trying to kill the patch. It might well be that the patch is already
> good enough that such scenarios will be extremely rare. However, it's
> easy to get overconfident when replacing a completely unintelligent
> system with a smarter one. The risk of something backfiring can
> sometimes be higher than one anticipates.
That's a fair point. The possibly-entirely-theoretical case that's in my
head is when your oldest and lowest-OID table is also the biggest and most
active. That seems like it could be a popular pattern in the field, and it
probably benefits to some degree from the sequential scan returning it
earlier. I don't know how much to worry about stuff like this.
--
nathan
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Subject: Re: another autovacuum scheduling thread
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