Re: PostgreSQL win32 fragmentation issue

From: "Andrew Dunstan" <andrew(at)dunslane(dot)net>
To: "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>
Cc: "Martijn van Oosterhout" <kleptog(at)svana(dot)org>, "PostgreSQL-development" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: PostgreSQL win32 fragmentation issue
Date: 2006-12-02 18:23:53
Message-ID: 1077.24.211.165.134.1165083833.squirrel@www.dunslane.net
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Joshua D. Drake wrote:
> On Sat, 2006-12-02 at 11:05 -0600, Andrew Dunstan wrote:
>> Joshua D. Drake wrote:
>> >
>> > O.k., doesn't this seem like killing a squirrel with a 50mm tank gun?
>> > The fact that this was suggested as anything but a last resort isn't
>> to
>> > inspiring.
>> >
>>
>> Before you start ringing alarm bells, you need to instrument the actual
>> performance effect.
>
> Alarm bells? I saw a potential issue, I brought it to the community.
> That is all.

You said:

"Essentially, this makes win32 impossible in a 24x7 environment (jokes
aside about Win32 in general) because we *have* to defrag on Windows and
Windows won't defrag open files (thus anything PostgreSQL is using)."

What I am asking for is evidence to back up that assertion. At the moment
it is, as Tom likes to say, "a fact not in evidence".

(I should have thought a single file DB would be MORE liable to
fragmentation, BTW).

cheers

andrew

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