[postgis-users] Extent on multiple tables

Mark Cave-Ayland m.cave-ayland at webbased.co.uk
Fri Oct 21 06:05:37 PDT 2005

Hi strk,

> -----Original Message-----
> From: postgis-users-bounces at postgis.refractions.net 
> [mailto:postgis-users-bounces at postgis.refractions.net] On 
> Behalf Of strk at refractions.net
> Sent: 21 October 2005 12:38
> To: 'PostGIS Users Discussion'
> Subject: Re: [postgis-users] Extent on multiple tables


> Are you sure inspected geometries will be kept in memory 
> after state function feed ?

I'm fairly certain they would for the extent() case, because PostgreSQL will
load the tuples from disk (and hence into shared buffers) during the
aggregate calculation. Of course this would not be the case for
estimated_extent() ;)

Kind regards,


WebBased Ltd
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