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

From: Hannu Krosing <hannu(at)skype(dot)net>
To: Martijn van Oosterhout <kleptog(at)svana(dot)org>
Cc: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>,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: 2005-12-27 22:47:31
Message-ID: 1135723651.3533.16.camel@localhost.localdomain (view raw or flat)
Thread:
Lists: pgsql-hackers
Ühel kenal päeval, T, 2005-12-27 kell 19:20, kirjutas Martijn van
Oosterhout:
> On Mon, Dec 26, 2005 at 11:00:51AM -0500, Bruce Momjian wrote:
> > 
> > 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.
> 
> I've thought of one other possibility, which is kind of at the extreme
> end of system implementation. Given the suggestion about not losing a
> whole table on unclean shutdown, how about using a single table, split.
> 
> 1. When setting no logging flag, take exclusive lock and record
> filesize. This size is X.
> 2. From now on any data before X is read-only. So no updates. Any new
> data needs to be allocated at end, so no FSM either.
> 3. Any data added after X is not logged to xlog.
> 4. On unclean shutdown, truncate table to length X.
> 5. When logging is reenabled, set X back to infinity.

How would it work for indexes ?

------------
Hannu


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