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From: Florian Weimer <fweimer@bfk.de>
To: pgsql-performance@postgresql.org
Subject: Re: Best way to index IP data?
Date: Mon, 14 Jan 2008 15:05:27 +0100
Message-ID: <82ir1wfqoo.fsf@mid.bfk.de> (raw)
In-Reply-To: <20080114111921.GE5294@mathom.us>
References: <Pine.LNX.4.64.0801111025390.30762@localhost>
	<13179.1200064791@sss.pgh.pa.us>
	<20080111162747.GT5294@mathom.us>
	<24044.1200082058@sss.pgh.pa.us>
	<20080111212703.GU5294@mathom.us>
	<20080111213710.GD8260@alvh.no-ip.org>
	<20080111220235.GX5294@mathom.us>
	<20080111222403.GA7527@crankycanuck.ca>
	<1259C7B1-C948-4326-B827-849C64B61A16@blighty.com>
	<827iicizg7.fsf@mid.bfk.de>
	<20080114111921.GE5294@mathom.us>

* Michael Stone:

>>Classful addressing is still part of many user interfaces, for
>>instance Cisco's IOS.  It's not just that the CLI accepts it, it's
>>also the standard[*] output format (that is, "192.0.2.0" instead of
>>"192.0.2.0/24"; if no prefix length is given, the one based on the
>>class is used).
>
> Again, is this at all ambiguous *in the context of a host IP*? (IOW,
> if I say that I recieved an IP packet from 10.0.0.1, are you really
> going to ask me to clarify the netmask?)

Hmm.  It's an argument for a separate CIDR type, not against a host
type.

I agree that a host type would be helpful.  I currently use check
constraints to ensure no one accidentally stores data of the wrong
type, which is not ideal (space is not a main concern at this point).

-- 
Florian Weimer                <fweimer@bfk.de>
BFK edv-consulting GmbH       http://www.bfk.de/
Kriegsstraße 100              tel: +49-721-96201-1
D-76133 Karlsruhe             fax: +49-721-96201-99



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