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From: Heikki Linnakangas <heikki@enterprisedb.com>
To: david@lang.hm
Cc: Steinar H. Gunderson <sgunderson@bigfoot.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Thousands of tables versus on table?
Date: Wed, 06 Jun 2007 08:29:35 +0100
Message-ID: <4666625F.9010308@enterprisedb.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0706051557070.24361@asgard.lang.hm>
References: <C289C6B1.A63%tandrews@soliantconsulting.com>
	<1180980943.31471.322.camel@archimedes>
	<46645DD9.7030805@soliantconsulting.com>
	<877iqjmro5.fsf@oxford.xeocode.com>
	<46647427.4030103@g2switchworks.com>
	<Pine.LNX.4.64.0706041631490.11737@asgard.lang.hm>
	<466593E5.1010904@g2switchworks.com>
	<87sl96z0wf.fsf@oxford.xeocode.com>
	<Pine.LNX.4.64.0706051325500.24361@asgard.lang.hm>
	<10525.1181080765@sss.pgh.pa.us>
	<20070605220609.GA9835@uio.no>
	<Pine.LNX.4.64.0706051557070.24361@asgard.lang.hm>

david@lang.hm wrote:
> On Wed, 6 Jun 2007, Steinar H. Gunderson wrote:
> 
>> On Tue, Jun 05, 2007 at 05:59:25PM -0400, Tom Lane wrote:
>>> I think the main argument for partitioning is when you are interested in
>>> being able to drop whole partitions cheaply.
>>
>> Wasn't there also talk about adding the ability to mark individual 
>> partitions
>> as read-only, thus bypassing MVCC and allowing queries to be satisfied 
>> using
>> indexes only?
>>
>> Not that I think I've seen it on the TODO... :-)
> 
> now that's a very interesting idea, especially when combined with 
> time-based data where the old times will never change.

That's been discussed, but it's controversial. IMHO a better way to 
achieve that is to design the dead-space-map so that it can be used to 
check which parts of a table are visible to everyone, and skip 
visibility checks. That doesn't require any user action, and allows updates.

-- 
   Heikki Linnakangas
   EnterpriseDB   http://www.enterprisedb.com



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