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Re: Foreign key order evaluation

From: Randy Yates <yates(at)ieee(dot)org>
To: pgsql-general(at)postgresql(dot)org
Subject: Re: Foreign key order evaluation
Date: 2004-09-28 13:26:41
Message-ID: wtyeh6cu.fsf@ieee.org (view raw or flat)
Thread:
Lists: pgsql-general
Mike,

I'm confused. Where is the lock? Is it on the 1 record in the model table?
If so, why is that record locked? Is it possible in Postgresql to update
the primary key of a record? 

--RY

mike(at)fuhr(dot)org (Michael Fuhr) writes:

> On Mon, Sep 27, 2004 at 03:19:47PM -0400, Shawn Chisholm wrote:
>> 
>> Hi, I am trying to deal with a deadlock situation caused by foreign
>> key references on insert and I was wondering if anyone knows what
>> order the foreign keys are locked (or evaluated) in for a particular
>> table?  Deferring the locks is unfortunately not a good option for me...
>
> What do you mean by "what order the foreign keys are locked"?  Can
> you give us an example of what you're doing and what problem you're
> trying to solve?  As I mentioned in reply to your earlier message,
> foreign key locking and the potential for deadlock were recently
> brought up in pgsql-general:
>
> http://archives.postgresql.org/pgsql-general/2004-09/msg00405.php
> http://archives.postgresql.org/pgsql-general/2004-09/msg00442.php
>
> My followup to that thread (the second link above) mentions somebody
> else's suggestion for a shared lock on the foreign key, but as far
> as I can tell, no such solution has been implemented as of 8.0.0beta3.
>
> -- 
> Michael Fuhr
> http://www.fuhr.org/~mfuhr/
>
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>

-- 
%  Randy Yates                  % "And all that I can do
%% Fuquay-Varina, NC            %  is say I'm sorry, 
%%% 919-577-9882                %  that's the way it goes..."
%%%% <yates(at)ieee(dot)org>           % Getting To The Point', *Balance of Power*, ELO
http://home.earthlink.net/~yatescr

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