On Tue, Mar 31, 2015 at 10:48 PM, Martin Davis <mtncl...@gmail.com> wrote:
> An update on this issue, which I think identifies the source of the
> problem with the slow WFS query.
>
> After experimenting with using the SDE Java API against the troublesome
> table, I found that the order of API calls is very important. You might
> expect that the API calls should look like this:
>
> query = new SeQuery(conn, columns, construct);
> query.setSpatialConstraints(...)
> query.prepareQuery();
>
> There's nothing in the API docs to suggest otherwise. However, this
> results in the very slow query performance (I suspect the prepareQuery
> wipes out the spatial filter, resulting in a full table scan being
> performed).
>
> If the statement order is the following, then the query completes very
> fast (indicating the spatial index is now being used):
>
> query = new SeQuery(conn, columns, construct);
> query.setSpatialConstraints(...)
> query.prepareQuery();
>
Confused, where is the difference? :-)
>
> So the question is: does the WMS path through the SDE driver result in a
> different statement order than the WFS path? And if so, how can this be
> fixed?
>
Hum... it may be, but a store is just a store, and
featureSource.getFeatures(Query) is the same method.
Maybe the contents of Query are different and this triggers a different
code path in the store?
One likely difference is that WFS (depending on your config and WFS version
used) needs to perform a count before getting
the actual data (part of the response headers), WMS does not.
CC'ing Gabriel, he's the last one to have worked on the SDE store.
Cheers
Andrea
--
==
GeoServer Professional Services from the experts! Visit
http://goo.gl/NWWaa2 for more information.
==
Ing. Andrea Aime
@geowolf
Technical Lead
GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 1660272
mob: +39 339 8844549
http://www.geo-solutions.it
http://twitter.com/geosolutions_it
*AVVERTENZE AI SENSI DEL D.Lgs. 196/2003*
Le informazioni contenute in questo messaggio di posta elettronica e/o
nel/i file/s allegato/i sono da considerarsi strettamente riservate. Il
loro utilizzo è consentito esclusivamente al destinatario del messaggio,
per le finalità indicate nel messaggio stesso. Qualora riceviate questo
messaggio senza esserne il destinatario, Vi preghiamo cortesemente di
darcene notizia via e-mail e di procedere alla distruzione del messaggio
stesso, cancellandolo dal Vostro sistema. Conservare il messaggio stesso,
divulgarlo anche in parte, distribuirlo ad altri soggetti, copiarlo, od
utilizzarlo per finalità diverse, costituisce comportamento contrario ai
principi dettati dal D.Lgs. 196/2003.
The information in this message and/or attachments, is intended solely for
the attention and use of the named addressee(s) and may be confidential or
proprietary in nature or covered by the provisions of privacy act
(Legislative Decree June, 30 2003, no.196 - Italy's New Data Protection
Code).Any use not in accord with its purpose, any disclosure, reproduction,
copying, distribution, or either dissemination, either whole or partial, is
strictly forbidden except previous formal approval of the named
addressee(s). If you are not the intended recipient, please contact
immediately the sender by telephone, fax or e-mail and delete the
information in this message that has been received in error. The sender
does not give any warranty or accept liability as the content, accuracy or
completeness of sent messages and accepts no responsibility for changes
made after they were sent or for other risks which arise as a result of
e-mail transmission, viruses, etc.
-------------------------------------------------------
------------------------------------------------------------------------------
Dive into the World of Parallel Programming The Go Parallel Website, sponsored
by Intel and developed in partnership with Slashdot Media, is your hub for all
things parallel software development, from weekly thought leadership blogs to
news, videos, case studies, tutorials and more. Take a look and join the
conversation now. http://goparallel.sourceforge.net/
_______________________________________________
Geoserver-users mailing list
Geoserver-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/geoserver-users
