Andrea thank you very much. ENABLE_ADVANCED_PROJECTION=false has stopped
geoerver from making the problem queries.
We will have to look into a more permanent solution but for now we can get our
production systems back to normal.
Cheers
Peter Warren
From: [email protected] [mailto:[email protected]] On Behalf Of Andrea
Aime
Sent: Wednesday, 25 March 2015 7:55 PM
To: Warren, Peter (Mineral Resources, North Ryde)
Cc: Geoserver-devel
Subject: Re: [Geoserver-devel] Propose to add an option for latLongBoundingBox
range checking before database query.
On Wed, Mar 25, 2015 at 6:27 AM,
<[email protected]<mailto:[email protected]>> wrote:
I have discussed this with Oracle at length but they are adamant that this is
the way Standard Edition should behave and they are unwilling to do anything
about it.
Given that Oracle were not going to help I did some tracing in
geotools/geoserver to find out what the code was doing and I found the
advanced_projection_handling section in geotools
(http://www.geo-solutions.it/blog/developers-corner-advanced-raster-projection-geoserver/).
I’m not entirely sure why this is needed or what it’s actually doing but if
enabled geotools generates these split bbox queries which cause us trouble.
Unfortunately, this is where my understanding of what’s going on ends, so if
anyone has any pointers to further information or a possible
solution/workaround to this problem I would really appreciate it.
If you want a quick solutions and don't care about mapping around the dateline,
you can disable map wrapping by setting this on your JVM:
-DENABLE_MAP_WRAPPING=false
and if you want to disable advanced projection handling fully, you can add this
one as well:
-DENABLE_ADVANCED_PROJECTION=false
With the first you will loose the ability to wrap a map around the dateline,
google maps style, with the second
you'll loose the ability to handle common projection issues when asking a bbox
outside their validity
area, or around difficult points/lines (e..g, poles, dateline, antimeridian to
the central meridian, and so on).
But it should remove the extra bbox.
The non easy solution is to work around the limitations of the database, split
the query and do a union but...
uh... that sounds like complex/hairy work (e..g, recognize the multiple bboxes
inside a otherwise complex
query, figure out how to split it in two parts, teach the jdbc data store to
create two queries with a union
in between, but only for Oracle standard edition, and so on...)
Chees
Andrea
--
==
GeoServer Professional Services from the experts! Visit
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==
Ing. Andrea Aime
@geowolf
Technical Lead
GeoSolutions S.A.S.
Via Poggio alle Viti 1187
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Italy
phone: +39 0584 962313
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