Back in the thick of things again, this thread was a bit too technical to
keep up with while on the road.
If I had to quickly do what you are describing I would set up each sql view
as you describe, and then use the pre generalized datastore to swap between
them based on scale. I am not *sure* the pregeneralied datastore is going
to be smart enough to swap between sqlviews (it does reach out to the
geoserver catalog so it might).
I am around this week if you want to catch up.
--
Jody Garnett
On 10 March 2015 at 11:00, Martin Davis <mtncl...@gmail.com> 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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conversation now. http://goparallel.sourceforge.net/
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