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From: Andres Freund <[email protected]>
To: Laurenz Albe <[email protected]>
Cc: Frits Hoogland <[email protected]>
Cc: Aleksander Alekseev <[email protected]>
Cc: [email protected]
Subject: Re: The ability of postgres to determine loss of files of the main fork
Date: Wed, 1 Oct 2025 09:49:10 -0400
Message-ID: <cbnna46p73gtyzbw22x67vuihcqmqwfbjgbzkdmrynovatvjlf@kwks4cei2jgh> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<CAJ7c6TMYvYBQpgv8k+4QnajqPcroOzrj7d3snBBTKX4tHQfVYw@mail.gmail.com>
	<[email protected]>
	<[email protected]>
	<[email protected]>

Hi,

On 2025-10-01 15:39:04 +0200, Laurenz Albe wrote:
> On Wed, 2025-10-01 at 13:58 +0200, Frits Hoogland wrote:
> > I am proposing the database to have the ability to detect when it has missing segments.
> 
> Just a random idea: one solution would be if each segment has a flag that indicates
> if that is the last segment or not.  But that would break the on-disk storage format,
> unless there is room left for an extra flag somewhere in the current layout.

It'd also make extensions / truncations more complicated. I rather doubt we're
going there. Right now relation extension aren't WAL logged. While there might
be reasons to change that, I don't think this is enough justification for
doing so.

Greetings,

Andres

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