On Tue, Mar 10, 2015 at 7:00 PM, 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?
>
>
You should fix this: http://jira.codehaus.org/browse/GEOT-4768
which in turns requires changes to the oracle store to figure out that a
field does not have a index (this info should be cached) and
emit the right syntax accordingly.
I believe you'd need two relatively simple changes to OracleDialect and
OracleFilterToSql
Cheers
Andrea
--
==
GeoServer Professional Services from the experts! Visit
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==
Ing. Andrea Aime
@geowolf
Technical Lead
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