Subject: Re: Missing lock conflict for ROW SHARE
To: diemersebastien@yahoo.fr, pgsql-docs@postgresql.org
References: <20170412100015.25934.47518@wrigleys.postgresql.org>
From: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
Organization: 2ndQuadrant
Message-ID: <eb963b35-367d-2694-118f-383b323a90d6@2ndquadrant.com>
Date: Fri, 21 Apr 2017 15:39:48 -0400
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On 4/12/17 06:00, diemersebastien@yahoo.fr wrote:
> The following documentation comment has been logged on the website:
> 
> Page: https://www.postgresql.org/docs/9.4/static/explicit-locking.html
> Description:
> 
> In my experience ROW SHARE conflicts with ROW EXCLUSIVE and this is not
> mentioned in the documentation. Am I missing something ?

This is not correct.  See the source for how the lock conflicts are
defined:
<https://git.postgresql.org/gitweb/?p=postgresql.git;a=blob;f=src/backend/storage/lmgr/lock.c;h=3e33bc104d3ee71ec87efb0c39485dda4867c00c;hb=c7681b2b9a115eb05048a485480826bc0efa6d3b#l62>

-- 
Peter Eisentraut              http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services


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