[mapserver-users] long-running postgres queries initiated by mapserver

[Matt Mendick]

Carlos,

Thank you for your response, and indeed the tables do have indices. The spatial search is just fine and comes back very quickly, however the text-based searches do not come back quickly (propertyIsLike for example).  I suppose I wasn't clear enough in my original question.  Mapserver does a case insensitive "like" query on the postgres server and on tables that are very large (millions of rows), this takes too long.  We are training the customers to search for things more intelligently, but we cannot stop them entirely.  We are looking into a full-text indexing methodology, but in the meantime, we need to solve the problem of the long-running queries.

-Matt

________________________________
From: Carlos Ruiz [mailto:boolean10001 at yahoo.com]
Sent: Tuesday, December 21, 2010 10:23 AM
To: Matt Mendick; mapserver-users at lists.osgeo.org
Subject: Re: [mapserver-users] long-running postgres queries initiated by mapserver

Matt,

I suggest to enhance the PostgreSQL performance at first. Each table with geometry must have a GiST spatial
index. When you upload a shape file to PostgreSQL, the shp2pgsql creates this index specifying the -I
parameter.

Have you uploaded your data in this way ?

If the geometry have been modified with PostGIS, you must recompute statistics to have the index updated.

Check if you have a spatial index in your table.

Cheers from México

IC Carlos Ruiz

________________________________
From: mattmendick <matt.mendick at pictometry.com>
To: mapserver-users at lists.osgeo.org
Sent: Tue, December 21, 2010 8:48:19 AM
Subject: [mapserver-users] long-running postgres queries initiated by mapserver


Hi All-

I'm running mapserver 5.6.3 under centos 5.4, using fastcgi. I'm using
postgres as the data storage container, and mapserver is primarily serving
WFS requests.  Sometimes, people do WFS queries that take a very long time
(searching for "virginia" on a nation-wide layer) and eventually postgres
will return with the result after a long time (hours later), however the
client has cancelled the WFS request.  Is there any way for mapserver to
know that the client has cancelled the http request, and it can therefore
stop the DB query to postgres?  I tried using persistent and non-persistent
connections with this:

PROCESSING "CLOSE_CONNECTION=DEFER"

but that didn't change the behavior.

Thanks a lot!
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