Spatial query runs slow on view

Question

Hello,
I have two tables and one of them has geometry column. I created view to join those two tables based on id column which has been indexed for both tables.
t1(
id number(9),
name varchar2(20)
t2(
id number(9),
geom MDSYS.SDO_GEOMETRY
CREATE VIEW v1 (
id,
name,
geom
) AS
SELECT /*+ FIRST_ROWS */ t1.id, t1.name, t2.geom
FROM t1,t2
WHERE t1.id = t2.id
When I query the view with following statement it runs very slow (there are more then 1 million rows in t2 table)
SELECT * FROM v1
WHERE mdsys.sdo_filter(geom, [a rectangle],'querytype=window') = 'TRUE';
but
SELECT /*+ FIRST_ROWS */ t1.id, t1.name,t2.geom
FROM t1,t2
WHERE t1.id=t2.id
and mdsys.sdo_filter(geom, [a rectangle],'querytype=window') = 'TRUE';
returns almost instantly. Can some one tell me what is wrong with the "create view" statement?
Thanks

Answer 1

Thank you for your reply. Here are the plans. The view looks for the spatial index first.
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)|
| 0 | SELECT STATEMENT | | 21 | 756 | 10 (60)|
| 1 | NESTED LOOPS | | 21 | 756 | 10 (60)|
| 2 | TABLE ACCESS BY INDEX ROWID| T2 | 5269 | 123K| 3 (0)|
| 3 | DOMAIN INDEX | T2_SDX | | | |
| 4 | TABLE ACCESS BY INDEX ROWID| T1 | | | |
| 5 | INDEX RANGE SCAN | T1_ID_IDX | 1 | | 0 (0)|
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)|
| 0 | SELECT STATEMENT | | 21 | 756 | 99 (3)|
| 1 | TABLE ACCESS BY INDEX ROWID | T2 | 1 | 24 | 99 (3)|
| 2 | NESTED LOOPS | | 21 | 756 | 99 (3)|
| 3 | TABLE ACCESS FULL | T1 | 21 | 252 | 2 (0)|
| 4 | BITMAP CONVERSION TO ROWIDS | | | | |
| 5 | BITMAP AND | | | | |
| 6 | BITMAP CONVERSION FROM ROWIDS| | | | |
| 7 | INDEX RANGE SCAN | T2_ID_IDX | 1 | | 2 (0)|
| 8 | BITMAP CONVERSION FROM ROWIDS| | | | |
| 9 | SORT ORDER BY | | | | |
| 10 | DOMAIN INDEX | T2_SDX | 1 | | |
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