From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
---|---|
To: | Alfred Perlstein <bright(at)wintelcom(dot)net> |
Cc: | Peter Eisentraut <peter_e(at)gmx(dot)net>, patches(at)postgreSQL(dot)org |
Subject: | Re: Lock |
Date: | 2000-06-01 18:41:36 |
Message-ID: | 200006011841.OAA20992@candle.pha.pa.us |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-patches |
Added to TODO.detail lock file.
> On Sat, 18 Dec 1999, Bruce Momjian wrote:
>
> > [Charset ISO-8859-1 unsupported, filtering to ASCII...]
> > > I was looking at this
> > >
> > > * Allow LOCK TABLE tab1, tab2, tab3 so all tables locked in unison
> > >
> > > but I'm not sure if my solution is really what was wanted, because it
> > > doesn't actually guarantee an all-or-nothing lock, it just locks each
> > > table in order. Thus it's more like a syntax simplification and reduces
> > > overhead.
> > >
> >
> > It took a few minutes, but I remember the use for this. If you are
> > going to hang waiting to lock tab3, you don't want to lock tab1 and tab2
> > while you are waiting for tab3 lock. The user wanted all tables to lock
> > in one operation without holding locks while waiting to complete all
> > locking.
> >
> > Can you do the locks, and if one fails, not hang, but unlock the
> > previous tables, go lock/hang on the failure, and go back and lock the
> > others? Seems it would have to be some kind of lock/fail/unlock/wait
> > loop.
> >
> > Does this make sense? It did to me.
>
> Guys, have a look at:
>
> http://www.freebsd.org/~terry/iml.txt
> http://jazz.external.hp.com/training/sqltables/c5s17.html
>
> It's a way to do locking with deadlock detection, and without loosing
> your place in line for locks, very nifty imo.
>
> -Alfred
>
>
> ************
>
>
--
Bruce Momjian | http://www.op.net/~candle
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
+ Christ can be your backup. | Drexel Hill, Pennsylvania 19026
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