Very slow simple spatial query on 11g

Question

I've created two spatial tables as following:
CREATE TABLE usregions
region_code NUMBER(1,0) NOT NULL,
shape ST_GEOMETRY,
CONSTRAINT usregions_pk PRIMARY KEY usregions(region_code)
INSERT INTO MDSYS.user_sdo_geom_metadata
(table_name, column_name, diminfo, srid)
VALUES ('USREGIONS', 'SHAPE',
sdo_dim_array (sdo_dim_element ('X', -180, 180, 0.5),
sdo_dim_element ('Y', -90, 90, 0.5)),
4269);
CREATE INDEX usregions_dx ON usregions (shape)
INDEXTYPE IS MDSYS.spatial_index;
CREATE TABLE usstates
state_code NUMBER(1,0) NOT NULL,
state_name VARCHAR2(30),
shape ST_GEOMETRY,
CONSTRAINT usstates_pk PRIMARY KEY usstates(state_code)
INSERT INTO MDSYS.user_sdo_geom_metadata
(table_name, column_name, diminfo, srid)
VALUES ('USSTATES', 'SHAPE',
sdo_dim_array (sdo_dim_element ('X', -180, 180, 0.5),
sdo_dim_element ('Y', -90, 90, 0.5)),
4269);
CREATE INDEX usstates_dx ON usstates (shape)
INDEXTYPE IS MDSYS.spatial_index;
I then loaded both tables with data from a shapefile.
The state shapefile is just the US map with all the states.
The region shapefile is the same US map with only 5 regions (Northeast, mid atlantic, mid west, south, and west).
I created the region shapefile from the state shapefile using ESRI ArcMap to dissolve the States border. So Pennsylvania, Virginia, Maryland, and DC is one polygon; New York and up is another polygon, etc.
I also created the same two tables, with the same data in SQL Server 2008 (KatMai), as well as in PostGRE 8.3.
Then I ran the following query:
SELECT s.state_name
FROM usstates s
WHERE s.shape.ST_Within((SELECT shape
FROM usregions
WHERE region_code=2))=1;
Region 2 is Mid Atlantic and I was expecting to see:
STATE_NAME
District of Columbia
Maryland
Pennsylvania
Virgina
Instead, Oracle 11g only returned "District of Columbia"
The query took 6.4 seconds to run.
On SQL Server 2008, I got the expected result and it took 0.4 seconds to execute.
On PostGRE 8.3, I also got the expected result and it took 0.5 seconds to execute.
Why is Oracle not returning all the States? Is this a bug?
Am I doing something wrong???
Thanks.

Answer 1

save data into internal backup format ???backup format doesn't matter, program is just reading rows from backup file and inserting them into database - so is generating SQL insert commands
>
and then it will restore it back to database. It isdone by inserts, each 500 row commit
I can't follow your post, but...yuck.program is just inserting records into T2 table, but on T2 table is trigger and inside trigger is SQL command "UPDATE TABLE T3 ..... where ......". In this time is T3 already filled with 60569 records.
And inserting going slower and slower. Without trigger is speed ok. But on oracle 10g speed is ok with this trigger. So I am concern about what could changed in oracle 11g and cause such behavior.
I will try produce some simple test example