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Re: [Bizgres-general] WAL bypass for INSERT, UPDATE and

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Martijn van Oosterhout <kleptog(at)svana(dot)org>
Cc: Simon Riggs <simon(at)2ndquadrant(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Greg Stark <gsstark(at)mit(dot)edu>, Rod Taylor <pg(at)rbt(dot)ca>, Qingqing Zhou <zhouqq(at)cs(dot)toronto(dot)edu>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: [Bizgres-general] WAL bypass for INSERT, UPDATE and
Date: 2005-12-26 16:00:51
Message-ID: 200512261600.jBQG0p801613@candle.pha.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers
I think this brings up an interesting distinction, that having the NO
LOGGING switch per command doesn't make sense because it modifying the
table.  It has to be a per-object switch, or something that operates
only on empty tables.  This is the exact same distinction we talked
about for NO LOGGING COPY.

---------------------------------------------------------------------------

Martijn van Oosterhout wrote:
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> On Mon, Dec 26, 2005 at 12:03:27PM +0000, Simon Riggs wrote:
> > I would not be against such a table-level switch, but the exact
> > behaviour would need to be specified more closely before this became a
> > TODO item, IMHO.
> 
> Well, I think at a per table level is the only sensible level. If a
> table isn't logged, neither are the indexes. After an unclean shutdown
> the data could be anywhere between OK and rubbish, with no way of
> finding out which way.
> 
> > If someone has a 100 GB table, they would not appreciate the table being
> > truncated if a transaction to load 1 GB of data aborts, forcing recovery
> > of the 100 GB table.
> 
> Ah, but wouldn't such a large table be partitioned in such a way that
> you could have the most recent partition having the loaded data.
> Personally, I think these "shared temp tables" have more applications
> than meet the eye. I've had systems with cache tables which could be
> wiped on boot. Though I think my preference would be to TRUNCATE rather
> than DROP on unclean shutdown.
> 
> Have a nice day,
> -- 
> Martijn van Oosterhout   <kleptog(at)svana(dot)org>   http://svana.org/kleptog/
> > Patent. n. Genius is 5% inspiration and 95% perspiration. A patent is a
> > tool for doing 5% of the work and then sitting around waiting for someone
> > else to do the other 95% so you can sue them.
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-- 
  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
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073

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