Re: [PATCHES] NO WAIT ...

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Hans-Jürgen Schönig <postgres(at)cybertec(dot)at>, PostgreSQL-development <pgsql-hackers(at)postgreSQL(dot)org>
Subject: Re: [PATCHES] NO WAIT ...
Date: 2004-02-18 18:56:14
Message-ID: 200402181856.i1IIuEH23831@candle.pha.pa.us
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Tom Lane wrote:
> =?ISO-8859-1?Q?Hans-J=FCrgen_Sch=F6nig?= <postgres(at)cybertec(dot)at> writes:
> > The problem with adding NO WAIT to specific commands is that is
> > inheritly unflexible. I think this is why the community has agreed on
> > implementing it based on GUC.
>
> I recall no such agreement ... when was this exactly? In any case
> Bruce's recent complaints about regex_flavor have altered my opinions
> about GUC variables a bit. They are bigger safety risks than they look,
> especially ones that change semantics and are intended to be modified on
> the fly.
>
> > Do you think it would help to reduce the GUCs flexibility by reducing
> > the lock levels a user is allowed to define?
>
> I will vote against the patch no matter what, but I agree that it would
> be less dangerous if it were confined to only apply to a limited set of
> lock types.

The question is whether we should have a GUC variable to control no
waiting on locks or add NO WAIT to specific SQL commands.

Does anyone want to vote _against_ the GUC idea for nowait locking. (We
already have two voting for such a variable.)

If there is no one except Tom, we can continue.

--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
+ If your life is a hard drive, | 13 Roberts Road
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