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Re: Block at a time ...

From: Greg Stark <gsstark(at)mit(dot)edu>
To: Scott Carey <scott(at)richrelevance(dot)com>
Cc: Craig James <craig_james(at)emolecules(dot)com>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Block at a time ...
Date: 2010-03-22 21:25:07
Message-ID: 407d949e1003221425i5ed0dd75x9203780cff236701@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-performance
On Mon, Mar 22, 2010 at 6:47 PM, Scott Carey <scott(at)richrelevance(dot)com> wrote:
> Its fairly easy to break.  Just do a parallel import with say, 16 concurrent tables being written to at once.  Result?  Fragmented tables.
>

Fwiw I did do some investigation about this at one point and could not
demonstrate any significant fragmentation. But that was on Linux --
different filesystem implementations would have different success
rates. And there could be other factors as well such as how full the
fileystem is or how old it is.

-- 
greg

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