Internal error for SDO_INTERSECTION

Question

Hi guys,
I wrote a procedure to create intsection line between a polyline table and a polygon table. The SQL statement is like this:
<code>
CREATE TABLE intersect_line_polygon AS
(SELECT B.polygon_id, A.line_id, SDO_GEOM.SDO_INTERSECTION(A.GEOM, B.GEOM, 0.005) AS INTERSECT_LINE
FROM LINE_INVENTORY A, POLYGON_INVENTORY B
WHERE SDO_RELATE(A.GEOM, B.GEOM, 'MASK=ANYINTERACT QUERYTYPE=WINDOW') = 'TRUE' AND A.TYPE IN ('1', '2'));
</code>
The oracle server turned to be very slow and returned the following error.
ORA-13050: unable to construct spatial object
Then I increased the tolerance to 0.5 to make the performance better. The server was still very slow, but returned a different error.
ORA-00600: internal error code, arguments: [kohdtf048], [], [], [], [], [], [],[]
ORA-06512: at "MDSYS.SDO_3GL", line 439
ORA-06512: at "MDSYS.SDO_GEOM", line 3145
ORA-06512: at "MDSYS.SDO_GEOM", line 3194
I don't know what the problem is. I guess there should be some other factors other than tolerance that caused these two errors. I can't increase the tolerance higher further. Can anyone give me a clue how to solve this problem? Thank you!
Chen

Answer 1

I've seen the same error in an intersection operation. One of the geometries was invalid. In my case, it was compounded by the fact that the geometry validation routine did NOT detect the fact that the geometry was invalid. There were duplicate vertices that were not detected when the tolerance was 1 meter, but were detected when the tolerance was 100 meters. Strange thing was that the duplicate vertices WERE within 1 meter of each other. Oracle has opened a bug on the issue.
- David