Re: SQL question....

[Karl Denninger <karl(at)denninger(dot)net>]

Steve Midgley wrote:
> At 12:20 PM 5/21/2008, pgsql-sql-owner(at)postgresql(dot)org wrote:
> > Date: Wed, 21 May 2008 06:39:11 -0500
> > From: Karl Denninger <karl(at)denninger(dot)net>
> > To: Gurjeet Singh <singh(dot)gurjeet(at)gmail(dot)com>
> > Cc: pgsql-sql(at)postgresql(dot)org
> > Subject: Re: SQL question....
> > Message-ID: <483409DF(dot)7050905(at)denninger(dot)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(at)denninger(dot)net)
http://www.denninger.net