Window query over a large area???

Question

We are using a fixed tile index covering the area of germany. SDO_LEVEL is 10, will be 15 later.
When trying to get an overview it take about 5 minutes to get the first results.
As I understood, oracle builds a spatial index with the same SDO_LEVEl for the window. Is there a trick to speed up the query (reduce the sdo_level) for the query window??
2) At the moment orcale 1st makes the spatial query and 2nd makes the relational one. Can I influence this???
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Answer 1

Statistic:
Oracle SQL Statement:
select line_id,gls_layer_section_id,feature_class,split_ind,
gpo_start_point_id,start_layer_section_id,
fc_value,rl_value,mod_user,mod_time,geometry
from lb_gdf_lines
where
feature_class = 4110 and
fc_value='1 '
and mdsys.sdo_filter(geometry, mdsys.sdo_geometry(
2003,NULL,NULL,mdsys.sdo_elem_info_array(1,1003,3),
mdsys.sdo_ordinate_array(65627816,511531059,72690439,516982749)
),'querytype=window') = 'TRUE'
Index :
INSERT INTO USER_SDO_GEOM_METADATA
VALUES (
'lb_gdf_points',
'geometry',
MDSYS.SDO_DIM_ARRAY(
MDSYS.SDO_DIM_ELEMENT('X', 58663558, 150421220, '0,005'),
MDSYS.SDO_DIM_ELEMENT('Y', 472701267, 550689060, '0,005')
NULL
CREATE INDEX gdf_sdo_lines_idx
ON lb_gdf_lines(geometry)
INDEXTYPE IS MDSYS.SPATIAL_INDEX
PARAMETERS('SDO_LEVEL = 14
TABLESPACE = GDF_IDX_01_01')
DECLARE
index_table varchar2(30);
vs_text varchar2(1000);
BEGIN
SELECT sdo_index_table INTO index_table FROM user_sdo_index_metadata
WHERE sdo_index_name = 'GDF_SDO_LINES_IDX';
vs_text := 'ANALYZE TABLE '| | index_table | | ' compute statistics';
EXECUTE IMMEDIATE vs_text;
END;
Geometry Statistic:
FC_VALUE COUNT(*)
0 46317
1 228352
2 250169
3 689713
4 421247
5 3680269
6 75783
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