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From: Laurenz Albe <[email protected]>
To: Nathan Bossart <[email protected]>
To: Robert Haas <[email protected]>
Cc: Gurjeet Singh <[email protected]>
Cc: Postgres Hackers <[email protected]>
Cc: Will Storey <[email protected]>
Subject: Re: Disabling vacuum truncate for autovacuum
Date: Fri, 28 Feb 2025 07:19:32 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <Z8EvFyf1D1AMxjOg@nathan>
References: <[email protected]>
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	<Z7Tl2d7HrG1AQEOc@nathan>
	<Z8EvFyf1D1AMxjOg@nathan>

On Thu, 2025-02-27 at 21:35 -0600, Nathan Bossart wrote:
> I spent some time on this one today.  A couple of notes:
> 
> * Since the reloption is a Boolean, there isn't a good way to tell whether
>   it is actually set for the table or if it just inherited the default
>   value.  This is important to know because we want the reloption to
>   override the GUC.

I agree with that, without being able to think of a better solution.

> * I didn't see a good GUC category for vacuum_truncate.  I suppose we could
>   create a new one, but for now I've just stashed it into the autovacuum
>   one.  Bikeshedding welcome.

Why not use "Client Connection Defaults / Statement Behavior", just like for
"vacuum_freeze_min_age"?  I don't think that "autovacuum" is appropriate,
since it applies to manual VACUUM as well.

Yours,
Laurenz Albe

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