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From: Laurenz Albe <[email protected]>
To: Achilleas Mantzios <[email protected]>
To: [email protected]
Subject: Re: Strange deadlock with object/target of lock : transaction
Date: Tue, 26 Aug 2025 08:22:42 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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On Mon, 2025-08-25 at 15:40 +0100, Achilleas Mantzios wrote:
> > > > > We've been hit by a weird deadlock which it took me some days to isolate and replicate.
> > > > > It does not have to do with order of updates or any explicit TABLE-level locking,
> > > > > the objects/targets of the deadlock in question are transactions. 
> 
> Hi I reproduced without the triggers, I understood the problem, I believe the system's
> behavior is the intended, I am sorry for the false alarm. The thing is that it takes >=3
> transactions to happen . That was the tricky part, up to now in all cases of deadlocks
> we had two transactions involved, this one needed three or more.

Yes, waiting for a transaction means that you are waiting for a row lock.
See https://www.cybertec-postgresql.com/en/row-locks-in-postgresql/

Yours,
Laurenz Albe

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