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> 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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