pg.ddx.io pgsql-performance@postgresql.org mailing list archivehelp / color / mirror / Atom feed
function difference(geometry,geometry) is SLOW! 2+ messages / 2 participants [nested] [flat]
* function difference(geometry,geometry) is SLOW! @ 2008-06-16 09:06 luke.78@libero.it <luke.78@libero.it> 0 siblings, 0 replies; 2+ messages in thread From: luke.78@libero.it @ 2008-06-16 09:06 UTC (permalink / raw) To: pgsql-performance Hi, In my pgsql procedure, i use the function geometryDiff := difference (geometry1,geometry2); but this function is very slow!!! What can I do to speed this function? Exists a special index for it? Thanks in advance! Luke ^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: [pgsql-performance] function difference(geometry, geometry) is SLOW! @ 2008-06-16 19:26 Chris Mair <chris@1006.org> 0 siblings, 0 replies; 2+ messages in thread From: Chris Mair @ 2008-06-16 19:26 UTC (permalink / raw) To: pgsql-performance > > Date: Mon, 16 Jun 2008 11:06:44 +0200 (CEST) > From: "luke.78@libero.it" <luke.78@libero.it> > To: pgsql-performance@postgresql.org > Subject: function difference(geometry,geometry) is SLOW! > Message-ID: > <10574478.390451213607204584.JavaMail.defaultUser@defaultHost> > > Hi, > In my pgsql procedure, i use the function > > geometryDiff := difference > (geometry1,geometry2); > > but this function is very slow!!! > What can I do to > speed this function? > Exists a special index for it? > > Thanks in advance! > Luke Hi, this is a postgis function. Postgis is an independent project and you might want to ask there: http://www.postgis.org/mailman/listinfo/postgis-users or http://www.faunalia.com/cgi-bin/mailman/listinfo/gfoss (italian). Anyway, as long as you just compute the difference between 2 given shapes, no index can help you. Indices speed up searches... Bye, Chris. ^ permalink raw reply [nested|flat] 2+ messages in thread
end of thread, other threads:[~2008-06-16 19:26 UTC | newest] Thread overview: 2+ messages (download: mbox mbox.gz follow: Atom feed) -- links below jump to the message on this page -- 2008-06-16 09:06 function difference(geometry,geometry) is SLOW! luke.78@libero.it <luke.78@libero.it> 2008-06-16 19:26 Re: [pgsql-performance] function difference(geometry, geometry) is SLOW! Chris Mair <chris@1006.org>
This inbox is served by DDX for PostgreSQL; see mirroring instructions for how to clone and mirror all data and code used for this inbox