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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