From: Hannu Krosing <hannu@2ndquadrant.com>
To: Justin Pitts <justinpitts@gmail.com>
Cc: Greg Smith <greg@2ndquadrant.com>
Cc: Alvaro Herrera <alvherre@commandprompt.com>
Cc: Andres Freund <andres@anarazel.de>
Cc: pgsql-performance@postgresql.org, Rob Wultsch <wultsch@gmail.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Subject: Re: Building multiple indexes concurrently
Date: Thu, 18 Mar 2010 23:20:35 +0200
Message-ID: <1268947235.19220.2472.camel@hvost> (raw)
In-Reply-To: <19B3D67A-3182-4323-B70D-CAD612F167A8@gmail.com>
References: <2c5ef4e31003161804l5e32ceb9v6b7019118f30004d@mail.gmail.com>
<2c5ef4e31003170807x3f26dd77v57a1631094bc5270@mail.gmail.com>
<4BA12328.4080803@2ndquadrant.com>
<201003172024.10538.andres@anarazel.de>
<20100317202401.GC3902@alvh.no-ip.org>
<4BA1403D.9030402@2ndquadrant.com>
<1268860727.19220.1089.camel@hvost>
<19B3D67A-3182-4323-B70D-CAD612F167A8@gmail.com>
On Thu, 2010-03-18 at 16:12 -0400, Justin Pitts wrote:
> It seems to me that a separate partition / tablespace would be a much simpler approach.
Do you mean a separate partition/ tablespace for _each_ index built
concurrently ?
> On Mar 17, 2010, at 5:18 PM, Hannu Krosing wrote:
>
> > On Wed, 2010-03-17 at 16:49 -0400, Greg Smith wrote:
> >> Alvaro Herrera wrote:
> >>> Andres Freund escribió:
> >>>
> >>>
> >>>> I find it way much easier to believe such issues exist on a tables in
> >>>> constrast to indexes. The likelihood to get sequential accesses on an index is
> >>>> small enough on a big table to make it unlikely to matter much.
> >>>>
> >>>
> >>> Vacuum walks indexes sequentially, for one.
> >>>
> >>
> >> That and index-based range scans were the main two use-cases I was
> >> concerned would be degraded by interleaving index builds, compared with
> >> doing them in succession.
> >
> > I guess that tweaking file systems to allocate in bigger chunks help
> > here ? I know that xfs can be tuned in that regard, but how about other
> > common file systems like ext3 ?
> >
> > -
> > Hannu Krosing http://www.2ndQuadrant.com
> > PostgreSQL Scalability and Availability
> > Services, Consulting and Training
> >
> >
> >
> > --
> > Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org)
> > To make changes to your subscription:
> > http://www.postgresql.org/mailpref/pgsql-performance
>
--
Hannu Krosing http://www.2ndQuadrant.com
PostgreSQL Scalability and Availability
Services, Consulting and Training
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Subject: Re: Building multiple indexes concurrently
In-Reply-To: <1268947235.19220.2472.camel@hvost>
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