Spatial Query Response Time

O/S - Sun Solaris
ver - Oracle 8.1.7
I am trying to improve the response time of the following query. Both tables contain polygons.
select a.data_id, a.GEOLOC from information_data a, shape_data b where a.info_id = 2 and b.shape_id = 271 and sdo_filter(a.GEOLOC,b.GEOLOC,'querytype=window')='TRUE'
The response time with info_id not indexed is 9 seconds. When I index info_id, I get the following error. Why is indexing info_id causing a spatial index error ? Also, other than manipulating the tiling level, is there anything else that could improve the response time ?
ERROR at line 1:
ORA-29902: error in executing ODCIIndexStart() routine
ORA-13208: internal error while evaluating [window SRID does not match layer
SRID] operator
ORA-06512: at "MDSYS.SDO_INDEX_METHOD", line 84
ORA-06512: at line 1
Thanks,
Ravi.

Hello Ravi,
Both layers should have SDO_SRID values set in order for the index to work properly.
After you do that you might want to add an Oracle hint to the query:
select /*+ ordered */ a.data_id, a.GEOLOC
from shape_data b, information_data a
where a.info_id = 2 and b.shape_id = 271
and sdo_filter(a.GEOLOC,b.GEOLOC,'querytype=window')='TRUE' ;
Hope this helps,
Dan
Also, if only one or very few rows have a.info_id=2 then the function sdo_geom.relate
might also work quickly.

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