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From: Laurenz Albe <[email protected]>
To: Subramanian,Ramachandran <[email protected]>
To: [email protected] <[email protected]>
Subject: Re: AW: how long should Archive logs be retained
Date: Fri, 28 Nov 2025 08:10:49 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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On Fri, 2025-11-28 at 04:46 +0000, Subramanian,Ramachandran wrote:
> Question >>>  Wow !!  That is so new to me.  So
> 1. if log wrap around happens  and some Wal-Files containing uncomitted log records are being overwritten,

No, they are deleted (well, perhaps recycled, but that amounts to the same).

> 2. AND  iin the mean time some data updates pertaining to these uncomitted transactions have been flushed from the data buffers to disk
> 3. AND after the data buffers have been flushed the transaction fails ( and I assume releases all the locks ) 
> 
> how does postgres know that  a particular unlocked row it finds in the disk ( or even the bufferpool
> for that matter ) is not in a valid state  even though it physically exists in the table?
> How can it decode this information?

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