Hi,
I am not sure but perhaps you could fool Oracle by inserting the point geometry
of the polygon into the SDO_POINT array of SDO_GEOMETRY. Oracle documentation
says that if SDO_ELEM_INFO and SDO_ORDINATES arrays are not both null then
SDO_POINT will be skipped. However, it would be so nice trick if that works
that I suggest to make a try.
http://docs.oracle.com/cd/B19306_01/appdev.102/b14255/sdo_objrelschema.htm
-Jukka-
________________________________
Martin Davis wrote:
Because I was hoping that GeoServer would make use of the GEOMETRY column in
the spatial filter. I tried NOT including it first of all, and that didn't
work, since the filter was applied on the PT field, causing the no-index error.
Unfortunately, GeoServer is too smart - if the SLD is based on the PT column
then it uses that column in the spatial filter!
On Tue, Mar 10, 2015 at 11:29 AM, Rahkonen Jukka (MML)
<jukka.rahko...@maanmittauslaitos.fi<mailto:jukka.rahko...@maanmittauslaitos.fi>>
wrote:
Hi,
Why do you select geometry and centroid into SQL view if you are only
interested in the centroid?
"select GEOMETRY, SDO_GEOM.SDO_CENTROID(GEOMETRY, 1) PT from CUT_BLOCK_SP "
-Jukka Rahkonen-
________________________________
Martin Davis wrote:
> We're working on tuning a GeoServer implementation over an Oracle SDO
> database. We think we are seeing that the network latency of queries is the
> hotspot in the performance of GeoServer render requests.
> It seems that for some situations one way to reduce the data being pushed
> over the wire is to reduce the data size in the database query. In
> particular, for some datasets of polygons we're happy just to see points
> representing the polygons. So we tried using a SQLView with a statement like:
select GEOMETRY, SDO_GEOM.SDO_CENTROID(GEOMETRY, 1) PT from CUT_BLOCK_SP
and then used an SLD <Geometry> selector to render just the point.
However, this doesn't work because we get the dreaded ORA-13226: interface not
supported without a spatial index error. This is because GeoServer is actually
emitting the query
SELECT PT as PT FROM (select GEOMETRY, SDO_GEOM.SDO_CENTROID(GEOMETRY, 1) PT
from CUT_BLOCK_SP t) VTABLE WHERE SDO_FILTER(PT, ?, 'mask=anyinteract
querytype=WINDOW') = 'TRUE'
and there is no index defined on the PT column.
Now, this would work if GeoServer could emit the query:
SELECT PT as PT FROM (select SDO_GEOM.SDO_CENTROID(GEOMETRY, 1) PT from
CUT_BLOCK_SP t) VTABLE WHERE SDO_FILTER(GEOMETRY, ?, 'mask=anyinteract
querytype=WINDOW') = 'TRUE'
Is there any way to get this to happen?
Or does anyone have other ideas about how to reduce query data size on Oracle?
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