Re: SELECT FOR SHARE and FOR UPDATE

From: Michael Fuhr <mike(at)fuhr(dot)org>
To: Ilja Golshtein <ilejn(at)yandex(dot)ru>
Cc: pgsql-general(at)postgresql(dot)org
Subject: Re: SELECT FOR SHARE and FOR UPDATE
Date: 2005-10-08 15:37:41
Message-ID: 20051008153741.GA28660@winnie.fuhr.org
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On Sat, Oct 08, 2005 at 11:16:08AM +0400, Ilja Golshtein wrote:
> I started to believe SELECT ... FOR SHARE is the remedy for my
> problems. Unfortunately it is not till I cannot combine share and
> exclusive locks for different tables in one query.
>
> I wonder if this limitation is fundamental or such a mixing of
> lock modes could be allowed in future releases? I badly need this
> feature.

The documentation says "It is currently not allowed," which suggests
that perhaps it could be allowed in a future version. Don't expect
to see it in 8.1, however, since that version is long past feature
freeze. I don't recall how much, if any, discussion there was on
this; search the pgsql-hackers archives to find out.

Could you tell us more about what you're doing? Maybe there's
another way to achieve it.

--
Michael Fuhr

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