Re: "deadlock detected" documentation

From: Jan Wieck <JanWieck(at)Yahoo(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Matt Mello <alien(at)spaceship(dot)com>, pgsql-sql(at)postgresql(dot)org
Subject: Re: "deadlock detected" documentation
Date: 2003-05-19 19:19:27
Message-ID: 3EC92E3F.6080703@Yahoo.com
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Tom Lane wrote:
> Matt Mello <alien(at)spaceship(dot)com> writes:
>
>>The two situations I can think of are:
>>1) Two FK fields in a single row pointing to 2 different FK tables, for
>>which any 2 updates get locks in opposite order (seems like a deadlock).
>
>
> I don't think this is possible, at least in 7.3. All backends are
> guaranteed to run the triggers of a given table in the same order,
> so the foreign-row locks should be acquired in the same column order
> in all cases.

Except the sessions set deferred modes differently.

Jan

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