On Aug 25, 2007, at 11:37 AM, Alex Povolotsky wrote:

> Hello!
>
> I'm working on a project requiring fast query like 'does ADDRESS
> belongs to SET OF NETWORKS?'. Naturally, such a query is better
> implemented using PATRICIA, but building PATRICIA tree is a
> relatively long task and is better to be done once, for instance,
> at server startup.
>
> I'm thinking of implementing such a tree using stored procedures,
> and looking for advise from postgresql-hackers: how can I hook
> startup of server?
>
> Idea of having something like a blob to store and restore PATRICIA
> tree may be better suited to standard SQL, but I'm looking for more
> elegant solution. Or am I totally wrong?
>

Patricia is a nice algorithm, but I suspect you'd be much happier with
GIST and http://pgfoundry.org/projects/ip4r/

Cheers,
Steve


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