Slow postGIS data query (was RE: [postgis-users] mapserver dbconnection)

Mark Cave-Ayland m.cave-ayland at
Wed Oct 26 02:16:52 PDT 2005

> -----Original Message-----
> From:	postgis-users-bounces at on behalf 
> of Frances
> Collier
> Sent:	Mon 10/24/2005 1:29 PM
> To:	postgis-users at
> Cc:	
> Subject:	[postgis-users] mapserver db connection
> Hello,
> I've been trying to find out what exactly Mapserver gets back 
> from Postgis when querying the tables. I haven't found this 
> to be documented anywhere. Does Postgis return a shape file, 
> layer, or simply data rows? The reason I'm asking is that I 
> noticed a huge time difference between connecting to Postgis 
> and simply calling the shape files - with the Postgis being 
> significantly slower. I know Postgis offers a lot more 
> functionality, but for simple comparisons I do not have any 
> type of filter applied.
> I'd appreciate any knowledge, advice, and/or direction.
> Thank you,
> Frances Collier

Hi Frances,

What do you mean by significantly slower? Can you quantify this in seconds,
for example a shapefile query is instant whereas a PostGIS query takes 5s?

Kind regards,


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