Re: SQL question....

Steve Midgley wrote:
> At 12:20 PM 5/21/2008, pgsql-sql-owner@postgresql.org wrote:
>> Date: Wed, 21 May 2008 06:39:11 -0500
>> From: Karl Denninger <karl@denninger.net>
>> To: Gurjeet Singh <singh.gurjeet@gmail.com>
>> Cc: pgsql-sql@postgresql.org
>> Subject: Re: SQL question....
>> Message-ID: <483409DF.7050905@denninger.net>
>>
>> > Also, if you don't have it already, you may create an index on IP
>> > column for better performance.
>> > Mail sent from my BlackLaptop device
>> Its a very large table and is indexed already...
>
> Not to completely beat this thing to death, but are you using an inet 
> or other custom datatype for this? I think if you index ip's using a 
> custom data type and search/group for specific octets, you'll get much 
> better performance than just searching via a regular b-tree string 
> index..
>
> http://www.postgresql.org/docs/8.3/static/datatype-net-types.html
>
> Steve
>
I'm using Inet but the searches/replaces that need to be done are all 
done on the full address.

In this case it doesn't do a bit of good because the entire table has to 
be sequential scanned.

Karl Denninger (karl@denninger.net)
http://www.denninger.net