Error When Deleting From A Trigger

Question

When I use a trigger to delete from my Oracle Spatial table, the triggering delete statement will fail if the Oracle Spatial table has a spatial index.
Details:
Tables CHEV_WELLBORE and CHEV_WELLBORE_SDO need to stay in sync. CHEV_WELLBORE_SDO has an sdo geometry column plus foreign keys to join back to CHEV_WELLBORE. When you delete from CHEV_WELLBORE, my trigger is supposed to delete the related row from CHEV_WELLBORE_SDO. When I execute the DELETE FROM CHEV_WELLBORE (one row), it processes for a minute or two then fails with an End Of Communications error. If I try the same thing without the spatial index on CHEV_WELLBORE_SDO it works fine. Can anyone see what I'm doing wrong here?
Connected to:
Oracle8i Enterprise Edition Release 8.1.6.0.0 - Production
With the Partitioning option
JServer Release 8.1.6.0.0 - Production
SQL> drop INDEX CHEV_WELLBORE_SPX force;
Index dropped.
SQL> CREATE OR REPLACE TRIGGER SYNC_WELLBORE_SDO_D
2 AFTER DELETE
3 ON CHEV_WELLBORE
4 FOR EACH ROW
5 WHEN ((old.NO2_BH_LONGITUDE IS NOT NULL AND old.NO2_BH_LATITUDE IS NOT NULL) OR (old.NOD_SURFACE_LONGITUDE IS NOT NULL AND old.NOD_SURFACE_LATITUDE IS NOT NULL))
6 BEGIN
7
8 -- Keep the CHEV_WELLBORE_SDO table in sync with CHEV_WELLBORE
9
10 DELETE FROM CHEV_WELLBORE_SDO WHERE CHEVNO = :old.CHEVNO AND SIDETRACK = :old.SIDETRACK;
11
12 EXCEPTION
13 WHEN OTHERS THEN
14 null; -- Do Nothing, and allow triggering statement to continue without error.
15
16 END;
17 /
Trigger created.
SQL>
SQL> DELETE FROM CHEV_WELLBORE WHERE CHEVNO = '123456';
5 rows deleted.
SQL> ROLLBACK
2 ;
Rollback complete.
SQL> CREATE INDEX CHEV_WELLBORE_SPX
2 ON CHEV_WELLBORE_SDO(GEOMETRY)
3 INDEXTYPE IS MDSYS.SPATIAL_INDEX
4 PARAMETERS (' SDO_LEVEL=14 SDO_NUMTILES=0 SDO_MAXLEVEL=32')
5 ;
Index created.
SQL> DELETE FROM CHEV_WELLBORE WHERE CHEVNO = '123456';
DELETE FROM CHEV_WELLBORE WHERE CHEVNO = '123456'
ERROR at line 1:
ORA-03113: end-of-file on communication channel

Answer 1

Does your DELETE key have an associated After-Process-Branch? Does you page have an "unconditional" Branch. Your unconditional one should have the highest sequence number (of all your branches).
If you have one assinged to the DELETE key, can you check to see what Page or URL is referenced withint that After-Process-Branch.