Re: ERRCODE_T_R_DEADLOCK_DETECTED

From: Andres Freund <andres(at)2ndquadrant(dot)com>
To: Tatsuo Ishii <ishii(at)postgresql(dot)org>
Cc: kgrittn(at)ymail(dot)com, pgsql-hackers(at)postgresql(dot)org
Subject: Re: ERRCODE_T_R_DEADLOCK_DETECTED
Date: 2015-03-19 14:33:54
Message-ID: 20150319143354.GG9495@alap3.anarazel.de
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On 2015-03-19 23:31:21 +0900, Tatsuo Ishii wrote:
> > That SQLSTATE value is intended to be used where the transaction
> > has failed because it was run concurrently with some other
> > transaction, rather than before or after it; and it is intended to
> > suggest that the transaction may succeed if run after the competing
> > transaction has completed. If those apply, it seems like the right
> > SQLSTATE. A user can certainly distinguish between the conditions
> > by looking at the error messages.
>
> It is sad for users the only way to distinguish the conditions is by
> looking at the error messages. They want to know the root of the
> problem.

Sure. It's always a balance. If you go to the extreme of your argument
every possible error gets one individual error code. But then error
handling gets too complex.

Greetings,

Andres Freund

--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services

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